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Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Least Squares Reconstruction of Doppler Radar Spectra for Irregular PRT  

Science Conference Proceedings (OSTI)

A least squares method for the reconstruction of Doppler spectra of weather radars with irregular pulse repetition time used to increase the range of unambiguous velocity is presented and evaluated. This method is a robust spectral method that is ...

John Kalogiros

2012-12-01T23:59:59.000Z

2

Mixed-Phase Cloud Retrievals Using Doppler Radar Spectra  

NLE Websites -- All DOE Office Websites (Extended Search)

Mixed-Phase Cloud Retrievals Using Mixed-Phase Cloud Retrievals Using Doppler Radar Spectra M. D. Shupe, S. Y. Matrosov, and T. L. Schneider National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado P. Kollias Rosentiel School of Marine Atmospheric Sciences University of Miami Miami, Florida Introduction The radar Doppler spectrum contains a wealth of information on cloud microphysical properties. Typically, radar-based cloud retrievals use only the zeroth or first moments of the Doppler spectrum - reflectivity and mean Doppler velocity - to derive quantities such as cloud water content and particle characteristic size (e.g., Liou and Sassen 1994; Matrosov et al. 2002). When using only the moments of the Doppler spectrum, important spectral information can be lost, particularly when the spectrum is

3

Retrieval of Cloud Microphysical Parameters from 94-GHz Radar Doppler Power Spectra  

Science Conference Proceedings (OSTI)

A technique is presented that uses Doppler spectra collected from a vertically pointing 94-GHz radar to reconstruct cloud and precipitation drop size distributions. A conceptual model describing the broadening of Doppler spectra by turbulence was ...

David M. Babb; Johannes Verlinde; Bruce A. Albrecht

1999-05-01T23:59:59.000Z

4

On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed to trace vertical air ...

Matthew D. Shupe; Pavlos Kollias; Michael Poellot; Edwin Eloranta

2008-04-01T23:59:59.000Z

5

Investigation of Non-Gaussian Doppler Spectra Observed by Weather Radar in a Tornadic Supercell  

Science Conference Proceedings (OSTI)

Radar Doppler spectra that deviate from a Gaussian shape were observed from a tornadic supercell on 10 May 2003, exhibiting features such as a dual peak, flat top, and wide skirt in the nontornadic region. Motivated by these observations, a ...

Tian-You Yu; Ricardo Reinoso Rondinel; Robert D. Palmer

2009-03-01T23:59:59.000Z

6

Separating Cloud and Drizzle Radar Moments during Precipitation Onset Using Doppler Spectra  

Science Conference Proceedings (OSTI)

The retrieval of cloud, drizzle, and turbulence parameters using radar Doppler spectra is challenged by the convolution of microphysical and dynamical influences and the overall uncertainty introduced by turbulence. A new technique that utilizes ...

Edward P. Luke; Pavlos Kollias

2013-08-01T23:59:59.000Z

7

Quality Control of Surface Wave Data Estimated from Low Signal-to-Noise Ratio HF Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

Ocean wave spectra estimated by high-frequency (HF) radar are very sensitive to the noise of Doppler spectra. The method for estimating wave spectra has been improved. This method is a nonlinear inversion and can be applied to a single radar case ...

Yukiharu Hisaki

2009-11-01T23:59:59.000Z

8

A High Resolution Hydrometer Phase Classifier Based on Analysis of Cloud Radar Doppler Spectra.  

SciTech Connect

The lifecycle and radiative properties of clouds are highly sensitive to the phase of their hydrometeors (i.e., liquid or ice). Knowledge of cloud phase is essential for specifying the optical properties of clouds, or else, large errors can be introduced in the calculation of the cloud radiative fluxes. Current parameterizations of cloud water partition in liquid and ice based on temperature are characterized by large uncertainty (Curry et al., 1996; Hobbs and Rangno, 1998; Intriery et al., 2002). This is particularly important in high geographical latitudes and temperature ranges where both liquid droplets and ice crystal phases can exist (mixed-phase cloud). The mixture of phases has a large effect on cloud radiative properties, and the parameterization of mixed-phase clouds has a large impact on climate simulations (e.g., Gregory and Morris, 1996). Furthermore, the presence of both ice and liquid affects the macroscopic properties of clouds, including their propensity to precipitate. Despite their importance, mixed-phase clouds are severely understudied compared to the arguably simpler single-phase clouds. In-situ measurements in mixed-phase clouds are hindered due to aircraft icing, difficulties distinguishing hydrometeor phase, and discrepancies in methods for deriving physical quantities (Wendisch et al. 1996, Lawson et al. 2001). Satellite-based retrievals of cloud phase in high latitudes are often hindered by the highly reflecting ice-covered ground and persistent temperature inversions. From the ground, the retrieval of mixed-phase cloud properties has been the subject of extensive research over the past 20 years using polarization lidars (e.g., Sassen et al. 1990), dual radar wavelengths (e.g., Gosset and Sauvageot 1992; Sekelsky and McIntosh, 1996), and recently radar Doppler spectra (Shupe et al. 2004). Millimeter-wavelength radars have substantially improved our ability to observe non-precipitating clouds (Kollias et al., 2007) due to their excellent sensitivity that enables the detection of thin cloud layers and their ability to penetrate several non-precipitating cloud layers. However, in mixed-phase clouds conditions, the observed Doppler moments are dominated by the highly reflecting ice crystals and thus can not be used to identify the cloud phase. This limits our ability to identify the spatial distribution of cloud phase and our ability to identify the conditions under which mixed-phase clouds form.

Luke,E.; Kollias, P.

2007-08-06T23:59:59.000Z

9

Moments of ambient Doppler spectra  

DOE Green Energy (OSTI)

The author studied the first four moments (center of mass, standard deviation, skew, and kurtosis) of the Doppler spectra in ambient regions of LLNL-Hughes real aperture radar data collected during WCSEX91--92. The goal was to correlate trends in the moments with wind velocity and direction. Although the center of mass appears to increase when the wind is blowing into the radar antenna, no other conclusions have been drawn from the higher order moments.

Lehman, S.K.

1993-03-23T23:59:59.000Z

10

Doppler Radar Observations of Mammatus  

Science Conference Proceedings (OSTI)

Observations of mammatus-like cloud features associated with a convective rain shower were obtained using a vertically pointing 8-mm-wavelength Doppler radar. The radar's excellent sensitivity and resolution allowed even very weak, finescale ...

Brooks E. Martner

1995-10-01T23:59:59.000Z

11

ARM - Measurement - Radar Doppler  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band (95 GHz) ARM Cloud Radar MMCR : Millimeter Wavelength Cloud Radar RWP : Radar Wind Profiler 50RWP : Radar Wind Profiler (50 MHz) WACR : W-Band (95 GHz) ARM Cloud Radar...

12

Analytical Expressions for Doppler Spectra of Scatter from Hydrometeors Observed with a Vertically Directed Radar Beam  

Science Conference Proceedings (OSTI)

A generalized expression is derived for the correlation function of signals backscattered from hydrometeors observed with a vertically pointed radar beam in which particle size distribution, turbulence, and mean wind are not homogeneous. This ...

Ming Fang; Richard J. Doviak; Bruce A. Albrecht

2012-04-01T23:59:59.000Z

13

Doppler Radar Sampling Limitations in Convective Storms  

Science Conference Proceedings (OSTI)

Vertical air motion data from a T-28 aircraft were filtered and sampled to simulate Doppler radar measurements. The results suggest that multiple Doppler radar analyses are subject to potentially large spatial aliasing errors in deep convection ...

R. E. Carbone; M. J. Carpenter; C. D. Burghart

1985-09-01T23:59:59.000Z

14

Airborne Doppler Radar Data Analysis Workshop  

Science Conference Proceedings (OSTI)

The Airborne Doppler Radar Data Analysis Workshop, sponsored by the Atmospheric Technology Division (ATD) of the National Center for Atmospheric Research (NCAR), was the first to focus on analyzing airborne Doppler radar data. The workshop (held ...

Wen-Chau Lee; Frank D. Marks; Craig Walther

2003-08-01T23:59:59.000Z

15

A Bistatic Multiple-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A multiple-Doppler radar network can be constructed using only one, traditional, transmitting pencil-beam radar and one or more passive, low-gain, nontransmitting receivers at remote sites. Radiation scattered from the pencil beam of the ...

Joshua Wurman; Stanley Heckman; Dennis Boccippio

1993-12-01T23:59:59.000Z

16

Operational Application of Meteorological Doppler Radar  

Science Conference Proceedings (OSTI)

Single Doppler weather radar velocity and reflectivity fields have been obtained with the National Center for Atmospheric Research (NCAR) 5 cm radars for a wide variety of weather situations. Among those weather features that can be identified by ...

James Wilson; Richard Carbone; Harold Baynton; Robert Serafin

1980-10-01T23:59:59.000Z

17

Mapping of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

Two sets of equations are derived to 1) map airborne Doppler radar data from an aircraft-relative coordinate system to an earth-relative coordinate system, and 2) remove the platform motion from the observed Doppler velocities. These equations ...

Wen-Chau Lee; Peter Dodge; Frank D. Marks Jr.; Peter H. Hildebrand

1994-04-01T23:59:59.000Z

18

Correction of Drop Shape-Induced Errors on Rain Rates Derived from Radar-Measured Doppler Spectra at Vertical Incidence  

Science Conference Proceedings (OSTI)

The shape of larger raindrops shows a deviation from spheres. This leads to a radar backscatter cross section different from the Rayleigh cross section. The drop shape-induced error for deducing rain rates is calculated. The resulting correction ...

Dirk Klugmann; Carolin Richter

1995-06-01T23:59:59.000Z

19

Multiple-Doppler Radar Network Design  

Science Conference Proceedings (OSTI)

Observing programs utilizing Doppler radar must have them deployed in optimum locations to best satisfy experimental objectives and maximize economies. One wishes to determine the coordinate triples (xi, yi, zi), where i equals the number of ...

Peter S. Ray; Karen L. Sangren

1983-08-01T23:59:59.000Z

20

Geostationary Doppler Radar and Tropical Cyclone Surveillance  

Science Conference Proceedings (OSTI)

The potential usefulness of spaceborne Doppler radar as a tropical cyclone observing tool is assessed by conducting a high-resolution simulation of an intense hurricane and generating synthetic observations of reflectivity and radial velocity. The ...

William E. Lewis; Eastwood Im; Simone Tanelli; Ziad Haddad; Gregory J. Tripoli; Eric A. Smith

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

A First-Guess Feature-Based Algorithm for Estimating Wind Speed in Clear-Air Doppler Radar Spectra  

Science Conference Proceedings (OSTI)

Algorithms for deriving winds from profiler range-gated spectra currently rely on consensus averaging to remove outliers from the subhourly velocity estimates. For persistent ground clutter in the echo return that is stronger than the atmospheric ...

E. E. Clothiaux; R. S. Penc; D. W. Thomson; T. P. Ackerman; S. R. Williams

1994-08-01T23:59:59.000Z

22

Wind Speeds in Two Tornadic Storms and a Tornado, Deduced from Doppler Spectra  

Science Conference Proceedings (OSTI)

Doppler spectra of a tornado were collected with a radar having a large unambiguous velocity range, ±91 m s?1. Thus for the first time a presentation of nonaliased spectra was possible, showing direct measurement of radial velocities. By fitting ...

Dusan Zrnic; Michael Istok

1980-12-01T23:59:59.000Z

23

A 94-GHz Doppler Radar for Cloud Observations  

Science Conference Proceedings (OSTI)

A Doppler radar operating at 3.2 mm wavelength was designed and assembled primarily for observation of clouds and precipitation. Phase detection of the radar signals which is required for Doppler operation is implemented through the use of a ...

Roger Lhermitte

1987-03-01T23:59:59.000Z

24

Retrieval of Atmospheric Parameters from Hydrometeor Backscatter Measured with Doppler Radar Profiler  

Science Conference Proceedings (OSTI)

The evaluation of backscatter spectra of clouds and precipitation measured with Doppler radar profilers allows the retrieval of a number of important atmospheric parameters. This retrieval leads to inaccurate results if vertical wind parameters ...

Dirk Klugmann

2001-01-01T23:59:59.000Z

25

Correction of Amplitudes of Bragg Lines in the Sea Echo Doppler Spectrum of an Ocean Radar  

Science Conference Proceedings (OSTI)

Amplitudes of Bragg lines in the Doppler spectrum of high frequency or very high frequency (VHF) ocean radar sea echoes are important because they are used in normalizing the second-order scattering when calculating ocean wave spectra. These ...

Yukiharu Hisaki

1999-10-01T23:59:59.000Z

26

Feasibility Test of an Airborne Pulse-Doppler Meteorological Radar  

Science Conference Proceedings (OSTI)

A vertically scanning, airborne, pulse-Doppler radar is described. Data processing methods to yield pseudo-dual-Doppler horizontal winds are presented. Results of an intercomparison with a ground-based dual-Doppler network are presented and ...

David P. Jorgensen; Peter H. Hildebrand; Charles L. Frush

1983-05-01T23:59:59.000Z

27

Using doppler radar images to estimate aircraft navigational heading error  

SciTech Connect

A yaw angle error of a motion measurement system carried on an aircraft for navigation is estimated from Doppler radar images captured using the aircraft. At least two radar pulses aimed at respectively different physical locations in a targeted area are transmitted from a radar antenna carried on the aircraft. At least two Doppler radar images that respectively correspond to the at least two transmitted radar pulses are produced. These images are used to produce an estimate of the yaw angle error.

Doerry, Armin W. (Albuquerque, NM); Jordan, Jay D. (Albuquerque, NM); Kim, Theodore J. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

28

Simulating Range Oversampled Doppler Radar Profiles of Inhomogeneous Targets  

Science Conference Proceedings (OSTI)

A new technique for generating range oversampled profiles of Doppler radar signals that have been backscattered by distributed targets is presented in this paper. The technique was developed for spaceborne cloud radars, but it can just as well be ...

N. A. J. Schutgens

2008-09-01T23:59:59.000Z

29

Gust Front Characteristics as Detected by Doppler Radar  

Science Conference Proceedings (OSTI)

Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...

Diana L. Klingle; David R. Smith; Marilyn M. Wolfson

1987-05-01T23:59:59.000Z

30

VHF and UHF Doppler Radars as Tools for Synoptic Research  

Science Conference Proceedings (OSTI)

Applications of VHF and UHF Doppler radars to research in synoptic meteorology are reviewed. We find that these radars show great potential for studies of large scales, but the area of research where the instruments really excel is in studying ...

M. F. Larsen; J. Röttger

1982-09-01T23:59:59.000Z

31

Measurement of Raindrop Size Distributions Using a Small Doppler Radar  

Science Conference Proceedings (OSTI)

A small X-band bistatic Doppler radar originally developed for use in automated weather stations as a Precipitation Occurrence Sensor System (POSS) can also measure real time raindrop size distributions. In contrast to large-scale pulsed Doppler ...

Brian E. Sheppard

1990-04-01T23:59:59.000Z

32

Comparison of Eddy Dissipation Rates from Spatial Spectra of Doppler Velocities and Doppler Spectrum Widths  

Science Conference Proceedings (OSTI)

Doppler radars offer unique data from which it is possible to estimate the turbulent eddy dissipation rates, ?. If the inertial subrange extends to lengths longer than the radar resolution volume size, ? can be obtained from the Doppler spectrum ...

Keith A. Brewster; Dusan S. Zrni?

1986-09-01T23:59:59.000Z

33

Spurious Velocities in Doppler Radar Data Caused by a Moving Antenna Feedhorn  

Science Conference Proceedings (OSTI)

Modern Doppler weather radars use clutter filtering to reduce the strength of ground targets and enhance the detection of meteorological echoes. WSR-88D [NEXRAD (Next Generation Radar) and TDWR (Terminal Doppler Weather Radar)] radars, for ...

Ronald E. Rinehart

1991-12-01T23:59:59.000Z

34

Extended Overdetermined Dual-Doppler Formalism in Synthesizing Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

During the intensive observing period of the field phase of the Coupled Ocean–Atmosphere Response Experiment (COARE) of the Tropical Oceans and Global Atmosphere (TOGA) program, airborne Doppler radars capable of fore–aft scanning (dual-Doppler ...

Michel Chong; Cláudia Campos

1996-06-01T23:59:59.000Z

35

An Atmospheric Soliton Observed with Doppler Radar, Differential Absorption Lidar, and a Molecular Doppler Lidar  

Science Conference Proceedings (OSTI)

Airborne Leandre II differential absorption lidar (DIAL), S-band dual-polarization Doppler radar (S-Pol), and Goddard Lidar Observatory for Winds (GLOW) Doppler lidar data are used, in conjunction with surface mesonet and special sounding data, ...

Steven E. Koch; Cyrille Flamant; James W. Wilson; Bruce M. Gentry; Brian D. Jamison

2008-08-01T23:59:59.000Z

36

A Wavelet-Based Ammunition Doppler Radar System  

Science Conference Proceedings (OSTI)

Today's state-of-the-art ammunition Doppler radars use the Fourier spectrogram for the joint time-frequency analysis of ammunition Doppler signals. In this paper, we implement the joint time-frequency analysis of ammunition Doppler signals based on the ...

S. H. Ong; Abbas Z. Kouzani

2001-12-01T23:59:59.000Z

37

Effects of Radar Sampling on Single-Doppler Velocity Signatures of Mesocyclones and Tornadoes  

Science Conference Proceedings (OSTI)

Simulated WSR-88D (Weather Surveillance Radar-1988 Doppler) radar data were used to investigate the effects of discrete azimuthal sampling on Doppler velocity signatures of modeled mesocyclones and tornadoes at various ranges from the radar and ...

Vincent T. Wood; Rodger A. Brown

1997-12-01T23:59:59.000Z

38

A Statistical Averaging Method for Wind Profiler Doppler Spectra  

Science Conference Proceedings (OSTI)

A new method is presented for Doppler spectral averaging that more reliably identifies the profiler radar return from clear air in the presence of contamination—for example, from migrating bird echoes. These very sensitive radars profile the wind ...

David A. Merritt

1995-10-01T23:59:59.000Z

39

Dealiasing Doppler Velocities Measured by a Bistatic Radar Network during a Downburst-Producing Thunderstorm  

Science Conference Proceedings (OSTI)

The object of this paper was to develop an automated dealiasing scheme that dealiases Doppler velocities measured by a bistatic Doppler radar network. The particular network consists of the C-band polarimetric diversity Doppler radar, POLDIRAD, ...

Katja Friedrich; Olivier Caumont

2004-05-01T23:59:59.000Z

40

Observations of Two Colorado Thunderstorms by Means of a Zenith-Pointing Doppler Radar  

Science Conference Proceedings (OSTI)

A description is given of the distributions of radar reflectivity, mean Doppler velocity, vertical air velocity and Doppler-velocity variance in two thunderstorms over eastern Colorado. A zenith-pointing Doppler radar was used to obtain data at ...

Louis J. Battan

1980-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Two Examples of Operational Tornado Warnings Using Doppler Radar Data  

Science Conference Proceedings (OSTI)

The National Weather Service Forecast Office in Denver, Colorado; has access to a variety of new observational datasets via an advanced, interactive workstation. This paper describes the impact of one of these datasets—Doppler radar—on the real-...

Lawrence B. Dunn

1990-02-01T23:59:59.000Z

42

Radar Wind Profiler Radial Velocity: A Comparison with Doppler Lidar  

Science Conference Proceedings (OSTI)

The accuracy of the radial wind velocity measured with a radar wind profiler will depend on turbulent variability and instrumental noise. Radial velocity estimates of a boundary layer wind profiler are compared with those estimated by a Doppler ...

Stephen A. Cohn; R. Kent Goodrich

2002-12-01T23:59:59.000Z

43

Objective Tropical Cyclone Center Tracking Using Single-Doppler Radar  

Science Conference Proceedings (OSTI)

This study presents an extension of the ground-based velocity track display (GBVTD)-simplex tropical cyclone (TC) circulation center–finding algorithm to further improve the accuracy and consistency of TC center estimates from single-Doppler radar ...

Michael M. Bell; Wen-Chau Lee

2012-05-01T23:59:59.000Z

44

Upscale Evolution of MCSs: Doppler Radar Analysis and Analytical Investigation  

Science Conference Proceedings (OSTI)

The development of two small mesoscale convective systems (MCSs) in northeastern Colorado is investigated via dual-Doppler radar analysis. The first system developed from several initially isolated cumulonimbi, which gradually coalesced into a ...

Ray L. McAnelly; Jason E. Nachamkin; William R. Cotton; Melville E. Nicholls

1997-06-01T23:59:59.000Z

45

VHF Doppler Radar Observations of Buoyancy Waves Associated with Thunderstorms  

Science Conference Proceedings (OSTI)

The Platteville VHF Doppler radar, located on the Colorado piedmont near Platteville, Colorado, continuously measured the vertical wind velocity during a 12-day period in late July and early August 1981. Measurements were made every 2.5 min on ...

Daren Lu; T. E. VanZandt; W. L. Clark

1984-01-01T23:59:59.000Z

46

Dealiasing of Doppler Radar Velocities Using a Torus Mapping  

Science Conference Proceedings (OSTI)

A novel dealiasing algorithm for Doppler radar velocity data has been developed at the Swedish Meteorological and Hydrological Institute (SMHI). Unlike most other methods, it does not need independent wind information from other instruments (e.g.,...

Günther Haase; Tomas Landelius

2004-10-01T23:59:59.000Z

47

Enclosing Shapes for Single-Doppler Radar Features  

Science Conference Proceedings (OSTI)

The primary function of the Terminal Doppler Weather Radar (TDWR) system is to issue microburst alerts when a microburst hazard endangers aircraft. The steps of the algorithm process include 1) determining that a microburst hazard is present, and ...

F. W. Wilson Jr.; R. K. Goodrich; K. Brislawn

1992-04-01T23:59:59.000Z

48

A 35-GHz Scanning Doppler Radar for Fog Observations  

Science Conference Proceedings (OSTI)

To observe fog, a 35-GHz scanning Doppler radar was designed, assembled, and tested. The radar, mounted on a flatbed vehicle for portability, transmits peak powers of 100 kW in a pulse of 0.5-µs width and a beamwidth of 0.3°. Thus, a reflectivity ...

Kyosuke Hamazu; Hiroyuki Hashiguchi; Toshio Wakayama; Tomoya Matsuda; Richard J. Doviak; Shoichiro Fukao

2003-07-01T23:59:59.000Z

49

A Comparison of Tornado Warning Lead Times with and without NEXRAD Doppler Radar  

Science Conference Proceedings (OSTI)

The installation of the network of NEXRAD (Next Generation Weather Radar) WSR-88D (Weather Surveillance Radar—1988 Doppler) radars has been an ongoing process for more than three years. An assessment is made on how these radars and related ...

Paul Bieringer; Peter S. Ray

1996-03-01T23:59:59.000Z

50

Smoke-Column Observations from Two Forest Fires Using Doppler Lidar and Doppler Radar  

Science Conference Proceedings (OSTI)

To demonstrate the usefulness of active remote-sensing systems in observing forest fire plume behavior, we studied two fires, one using a 3.2-cm-wavelength Doppler radar, and one more extensively, using Doppler lidar. Both instruments observed ...

R. M. Banta; L. D. Olivier; E. T. Holloway; R. A. Kropfli; B. W. Bartram; R. E. Cupp; M. J. Post

1992-11-01T23:59:59.000Z

51

Evaluation of Meteorological Airborne Doppler Radar. Part II: Triple-Doppler Analyses of Air Motions  

Science Conference Proceedings (OSTI)

This is Part II of a paper dealing with the capabilities and use of airborne Doppler radar to observe motions within storms. Part I deals with dual-Doppler analyses of convective storm structure, using airborne and combinations of airborne and ...

Cynthia K. Mueller; Peter H. Hildebrand

1985-09-01T23:59:59.000Z

52

The ELDORA/ASTRAIA Airborne Doppler Weather Radar: High-Resolution Observations from TOGA COARE  

Science Conference Proceedings (OSTI)

The ELDORA/ASTRAIA (Electra Doppler Radar/Analyese Stereoscopic par Impulsions Aeroporte) airborne Doppler weather radar was recently placed in service by the National Center for Atmospheric Research and the Centre d'étude des Environnements ...

Peter H. Hildebrand; Wen-Chau Lee; Craig A. Walther; Charles Frush; Mitchell Randall; Eric Loew; Richard Neitzel; Richard Parsons; Jacques Testud; François Baudin; Alain LeCornec

1996-02-01T23:59:59.000Z

53

Design and Deployment of a Portable, Pencil-Beam, Pulsed, 3-cm Doppler Radar  

Science Conference Proceedings (OSTI)

A portable, pencil-beam, pulsed, Doppler, 3-cm wavelength radar has been constructed to study a wide variety of meteorological phenomena including tornadoes, severe storms, and boundary layer processes. The new radar, the Doppler on Wheels (DOW), ...

Joshua Wurman; Jerry Straka; Erik Rasmussen; Mitch Randall; Allen Zahrai

1997-12-01T23:59:59.000Z

54

The Genesis of Three Nonsupercell Tornadoes Observed with Dual-Doppler Radar  

Science Conference Proceedings (OSTI)

Dual-Doppler radar analyses of three tornadoes associated with a multicellular line of storms are presented. The F2–F3 intensity tornadoes occurred on 15 June 1988 near Denver, Colorado, during the Terminal Doppler Weather Radar (TDWR) Project. ...

Rita D. Roberts; James W. Wilson

1995-12-01T23:59:59.000Z

55

Doppler Cloud Radar Derived Drop Size Distributions in Liquid Water Stratus Clouds  

Science Conference Proceedings (OSTI)

A cloud particle size retrieval algorithm that uses radar reflectivity factor and Doppler velocity obtained by a 35-GHz Doppler radar and liquid water path estimated from microwave radiometer radiance measurements is developed to infer the size ...

Seiji Kato; Gerald G. Mace; Eugene E. Clothiaux; James C. Liljegren; Richard T. Austin

2001-10-01T23:59:59.000Z

56

Observations of a Colorado Tornado. Part II: Combined Photogrammetric and Doppler Radar Analysis  

Science Conference Proceedings (OSTI)

An integrated analysis of photographic and Doppler radar observations of a tornadic storm during the Convection Initiation and Downburst Experiment (CINDE) is presented. High-resolution single-Doppler radar measurements are combined with cloud ...

Roger M. Wakimoto; Brooks E. Martner

1992-04-01T23:59:59.000Z

57

Eddy Dissipation Rates in Thunderstorms Estimated by Doppler Radar in Relation to Aircraft In Situ Measurements  

Science Conference Proceedings (OSTI)

High-resolution aircraft turbulence measurements, well coordinated with radar Doppler spectral width measurements, have been used to verify radar-estimated energy dissipation rates within thunderstorms anvils. The radar-estimated eddy dissipation ...

Peter Meischner; Robert Baumann; Hartmut Höller; Thomas Jank

2001-10-01T23:59:59.000Z

58

A Solo-based automated quality control algorithm for airborne tail Doppler radar data  

Science Conference Proceedings (OSTI)

An automated quality control pre-processing algorithm for removing non-weather radar echoes in airborne Doppler radar data has been developed. This algorithm can significantly reduce the time and experience level required for interactive radar ...

Michael M. Bell; Wen-Chau Lee; Cory A. Wolff; Huaqing Cai

59

Doppler Radar Observations of Dust Devils in Texas  

Science Conference Proceedings (OSTI)

Analyses of a dust-devil dataset collected in northwest Texas are presented. The data were collected just above the ground at close range with a mobile, W-band (3-mm wavelength) Doppler radar having an azimuthal (radial) resolution of 3–5 m (30 m)...

Howard B. Bluestein; Christopher C. Weiss; Andrew L. Pazmany

2004-01-01T23:59:59.000Z

60

Can a VHF Doppler Radar Provide Synoptic Wind Data? A Comparison of 30 Days of Radar and Radiosonde Data  

Science Conference Proceedings (OSTI)

A number of experiments have shown that UHF and VHF Doppler radars can make “clear air” wind measurements in the troposphere and lower stratosphere, even in the presence of clouds and precipitation. Past comparisons of radar and rawinsonde ...

Miguel Folkmar Larsen

1983-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Doppler Spectra and Estimated Windspeed of a Violent Tornado  

Science Conference Proceedings (OSTI)

Presented in this Paper are Doppler spectra of a very large tornado that occurred on 22 May 1981 near Binger, Oklahoma. Tracking of the tornado was accomplished with the help of a novel “polar spectra display.” Bimodal tornado spectral signatures ...

Dusan Zrni?; Donald W. Burgess; Larry Hennington

1985-10-01T23:59:59.000Z

62

The Influence of Airborne Doppler Radar Data Quality on Numerical Simulations of a Tropical Cyclone  

Science Conference Proceedings (OSTI)

The impact of airborne Doppler radar data assimilation on improving numerical simulations of tropical cyclones (TCs) has been well recognized. However, the influence of radar data quality on the numerical simulation of tropical cyclones has not ...

Lei Zhang; Zhaoxia Pu; Wen-Chau Lee; Qingyun Zhao

2012-02-01T23:59:59.000Z

63

A Doppler Radar Emulator with an Application to the Detectability of Tornadic Signatures  

Science Conference Proceedings (OSTI)

A Doppler radar emulator was developed to simulate the expected mean returns from scanning radar, including pulse-to-pulse variability associated with changes in viewing angle and atmospheric structure. Based on the user’s configuration, the ...

Ryan M. May; Michael I. Biggerstaff; Ming Xue

2007-12-01T23:59:59.000Z

64

Doppler-Radar Measurements of Clear Air Atmospheric Turbulence at 1290 MHz  

Science Conference Proceedings (OSTI)

We present Doppler-radar observations for the refractivity turbulence structure constant CN2 obtained with the Chatanika Radar Facility, near Fairbanks, Alaska, during a 7-day observing period in October 1976.

Ben Balsley; Vern L. Peterson

1981-03-01T23:59:59.000Z

65

High-Resolution, Mobile Doppler Radar Observations of Cyclic Mesocyclogenesis in a Supercell  

Science Conference Proceedings (OSTI)

On 15 May 2003, two ground-based, mobile, Doppler radars scanned a supercell that moved through the Texas Panhandle and cyclically produced mesocyclones. The two radars collected data from the storm during a rapid cyclic mesocyclogenesis stage ...

Michael M. French; Howard B. Bluestein; David C. Dowell; Louis J. Wicker; Matthew R. Kramar; Andrew L. Pazmany

2008-12-01T23:59:59.000Z

66

The Measurement of Doppler Wind Fields with Fast Scanning Radars: Signal Processing Techniques  

Science Conference Proceedings (OSTI)

This paper discusses signal processing techniques being developed for making Doppler wind velocity measurements using airport surveillance radars. Techniques are presented and evaluated for velocity estimation using fast-rotating radars. In ...

John R. Anderson

1987-12-01T23:59:59.000Z

67

A Wintertime Gulf Coast Squall Line Observed by EDOP Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

An extensive wintertime squall line on 13 January 1995 occurring along the U.S. Gulf of Mexico coastline is examined using airborne radar observations combined with conventional data analysis. Flight tracks with the ER-2 Doppler radar (EDOP) ...

G. M. Heymsfield; J. B. Halverson; I. J. Caylor

1999-12-01T23:59:59.000Z

68

Fixed-Antenna Pointing-Angle Calibration of Airborne Doppler Cloud Radar  

Science Conference Proceedings (OSTI)

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind ...

Samuel Haimov; Alfred Rodi

2013-10-01T23:59:59.000Z

69

Simulated Doppler Radar Observations of Inhomogeneous Clouds: Application to the EarthCARE Space Mission  

Science Conference Proceedings (OSTI)

A new simulation technique for spaceborne Doppler radar observations that was developed specifically for inhomogeneous targets is presented. Cloud inhomogeneity affects Doppler observations in two ways. First, line-of-sight velocities within the ...

N. A. J. Schutgens

2008-01-01T23:59:59.000Z

70

A Technique for Detecting a Tropical Cyclone Center Using a Doppler Radar  

Science Conference Proceedings (OSTI)

A ground-based Doppler radar technique is developed for detecting a tropical cyclone center position. Accurate determination of the cyclone center position, based on Doppler velocity measurements, will become essential for the issuance of ...

Vincent T. Wood

1994-10-01T23:59:59.000Z

71

Climatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Ice cloud properties are influenced by cloud-scale vertical air motion. Dynamical properties of ice clouds can be determined via Doppler measurements from ground-based, profiling cloud radars. Here, the decomposition of the Doppler velocities into ...

Heike Kalesse; Pavlos Kollias

72

Fixed-antenna Pointing-angle Calibration of Airborne Doppler Cloud Radar  

Science Conference Proceedings (OSTI)

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind ...

Samuel Haimov; Alfred Rodi

73

Rainfall Doppler Velocity Measurements from Spaceborne Radar: Overcoming Nonuniform Beam-Filling Effects  

Science Conference Proceedings (OSTI)

For vertical Doppler velocity measurements of a homogeneous rain field, the standard spectral moment estimation techniques commonly used by ground-based and airborne Doppler rain radars can be readily extended for spaceborne application, provided ...

Simone Tanelli; Eastwood Im; Stephen L. Durden; Luca Facheris; Dino Giuli; Eric A. Smith

2004-01-01T23:59:59.000Z

74

Using Doppler spectra to separate hydrometeor populations and analyze ice precipitation in multilayered mixed-phase clouds  

SciTech Connect

Multimodality of cloud radar Doppler spectra is used to partition cloud particle phases and to separate distinct ice populations in the radar sample volume, thereby facilitating analysis of individual ice showers in multilayered mixed-phase clouds. A 35-GHz cloud radar located at Barrow, Alaska, during the Mixed-Phase Arctic Cloud Experiment collected the Doppler spectra. Data from a pair of collocated depolarization lidars confirmed the presence of two liquid cloud layers reported in this study. Surprisingly, both of these cloud layers were embedded in ice precipitation yet maintained their liquid. Our spectral separation of the ice precipitation yielded two distinct ice populations: ice initiated within the two liquid cloud layers and ice precipitation formed in higher cloud layers. Comparisons of ice fall velocity versus radar reflectivity relationships derived for distinct showers reveal that a single relationship might not properly represent the ice showers during this period.

Rambukkange, Mahlon P.; Verlinde, J.; Eloranta, E. W.; Flynn, Connor J.; Clothiaux, Eugene E.

2011-01-31T23:59:59.000Z

75

The NIMA Method for Improved Moment Estimation from Doppler Spectra  

Science Conference Proceedings (OSTI)

The NCAR Improved Moments Algorithm (NIMA) for estimating moments from wind measurement devices that measure Doppler spectra as a function of range is described in some detail. Although NIMA's main application has been for real-time processing of ...

Corinne S. Morse; Robert K. Goodrich; Larry B. Cornman

2002-03-01T23:59:59.000Z

76

Sea Ice Identification and Derivation of Its Velocity Field by X-Band Doppler Radar  

Science Conference Proceedings (OSTI)

In this study a 3D scanning X-band Doppler radar (XDR) was deployed near the coast of the Sea of Okhotsk, Hokkaido, Japan, in November 2005 to simultaneously observe sea ice and snow clouds. Doppler radars are commonly used to detect wind fields ...

Yasushi Fujiyoshi; Koji Osumi; Masayuki Ohi; Yoshinori Yamada

2013-06-01T23:59:59.000Z

77

Scatter and Doppler Effect of Wind Power Plants to Land Radars  

Science Conference Proceedings (OSTI)

Wind power plant installations at different scales are in an increasing pattern starting from year 2000. A curiosity has been raised about 4-5 years ago for if wind turbines interfere with radars. The interference occurs when wind turbines reflect radar ... Keywords: clutter, Doppler, radar, scatter, turbine, wind

Derya Sozen; Mesut Kartal

2012-03-01T23:59:59.000Z

78

What Should Be Considered When Simulating Doppler Velocities Measured by Ground-Based Weather Radars?  

Science Conference Proceedings (OSTI)

A sophisticated and flexible simulator of Doppler velocities measured by ground-based weather radars is appended to a high-resolution nonhydrostatic atmospheric model. Sensitivity experiments are conducted by using different configurations for ...

Olivier Caumont; Véronique Ducrocq

2008-08-01T23:59:59.000Z

79

Clutter Filtering and Spectral Moment Estimation for Doppler Weather Radars Using Staggered Pulse Repetition Time (PRT)  

Science Conference Proceedings (OSTI)

In this paper, a new algorithm for the estimation of spectral parameters from the signal time series, collected using the staggered pulse repetition time (PRT) transmission in a Doppler weather radar, is presented. The algorithm uses the Fourier ...

M. Sachidananda; D. S. Zrni?

2000-03-01T23:59:59.000Z

80

Determination of Winds from Balloon Tracking with a Doppler Weather Radar  

Science Conference Proceedings (OSTI)

Computer programs for antenna control and data processing were prepared and interfacing was fabricated to enable the Doppler radar at Norman, Oklahoma, to track a reflectorized balloon, and define winds in the layer through which the balloon ...

Dúsan S. Zrni?; Dale Sirmans; Edwin Kessler

1988-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Terminal Doppler Weather Radar Observation of Atmospheric Flow over Complex Terrain during Tropical Cyclone Passages  

Science Conference Proceedings (OSTI)

A Terminal Doppler Weather Radar (TDWR) started operation in Hong Kong, China, in 1997 for monitoring wind shear associated with thunderstorms affecting the Hong Kong International Airport. The airport was built on land reclaimed from the sea and ...

C. M. Shun; S. Y. Lau; O. S. M. Lee

2003-12-01T23:59:59.000Z

82

A Millimeter-Wavelength Dual-Polarization Doppler Radar for Cloud and Precipitation Studies  

Science Conference Proceedings (OSTI)

A pulse Doppler radar system operating at 35 GHz and having full polarization (linear and circular) diversity capability is described. Separate antennas are used for the transmitter and the receiver because this design approach allows better ...

F. Pasqualucci; B. W. Bartram; R. A. Kropfli; W. R. Moninger

1983-05-01T23:59:59.000Z

83

A Dual-Doppler Radar Study of an OK PRE-STORM Heat Burst Event  

Science Conference Proceedings (OSTI)

Doppler and conventional radar, surface mesonetwork, and sounding data are used to investigate heat bursts that accompanied a mesoscale convective system (MCS) that traversed the OK PRE-STORM (Oklahoma–Kansas Preliminary Regional Experiment for ...

Ben C. Bernstein; Richard H. Johnson

1994-02-01T23:59:59.000Z

84

A Study of Embryo Production and Hail Growth Using Dual-Doppler and Multiparameter Radars  

Science Conference Proceedings (OSTI)

The origin and importance to embryo and hail production of a region of drops advected above the freezing level in the updraft of a severe Colorado hailstorm is examined using radar polarization measurements in conjunction with dual-Doppler and ...

John W. Conway; Dušan S. Zrni?

1993-09-01T23:59:59.000Z

85

Vector Winds from a Single-Transmitter Bistatic Dual-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A bistatic dual-Doppler weather radar network consisting of only one transmitter and a nontransmitting, nonscanning, low-cost bistatic receiver was deployed in the Boulder, Colorado, area during 1993.

Joshua Wurman

1994-06-01T23:59:59.000Z

86

Performance of Mean-Frequency Estimators for Doppler Radar and Lidar  

Science Conference Proceedings (OSTI)

The performance of mean-frequency estimators for Doppler radar and lidar measurements of winds is presented in terms of two basic parameters: ?, the ratio of the average signal energy per estimate to the spectral noise level; and ?, which is ...

R. G. Frehlich; M. J. Yadlowsky

1994-10-01T23:59:59.000Z

87

Pressure and Buoyancy Fields Derived from Doppler Radar Data in a Tornadic Thunderstorm  

Science Conference Proceedings (OSTI)

A method for retrieval of pressure and buoyancy distributions in deep convection is applied to Doppler radar data collected at two analysis times during the tornadic Del City (Oklahoma) thunderstorm of 20 May 1977. Change of a previous version of ...

Carl E. Hane; Peter S. Ray

1985-01-01T23:59:59.000Z

88

Recognizing Low-Altitude Wind Shear Hazards from Doppler Weather Radar: An Artificial Intelligence Approach  

Science Conference Proceedings (OSTI)

This paper describes an artificial intelligence-based approach for automated recognition of wind shear hazards. The design of a prototype system for recognizing low-attitude wind shear events from Doppler radar displays is presented. This system, ...

Steven D. Campbell; Stephen H. Olson

1987-03-01T23:59:59.000Z

89

Doppler Radar and Lightning Network Observations of a Severe Outbreak of Tropical Cyclone Tornadoes  

Science Conference Proceedings (OSTI)

Data from a single Weather Surveillance Radar-1988 Doppler (WSR-88D) and the National Lightning Detection Network are used to examine the characteristics of the convective storms that produced a severe tornado outbreak, including three tornadoes ...

Eugene W. McCaul Jr.; Dennis E. Buechler; Steven J. Goodman; Michael Cammarata

2004-07-01T23:59:59.000Z

90

Microburst Wind Structure and Evaluation of Doppler Radar for Airport Wind Shear Detection  

Science Conference Proceedings (OSTI)

Doppler weather radar data from the Joint Airport Weather Studies (JAWS) Project are used to determine the horizontal and vertical structure of airflow within microbursts. Typically, the associated downdraft is about 1 km wide and begins to ...

James W. Wilson; Rita D. Roberts; Cathy Kessinger; John McCarthy

1984-06-01T23:59:59.000Z

91

Cell Development and Merger in an Illinois Thunderstorm Observed by Doppler Radar  

Science Conference Proceedings (OSTI)

A reflectivity and triple-Doppler radar study of the development of several cells and their successive union within a nonsevere thunderstorm is presented. Two characteristic separations were found between the newly formed cells and the parent ...

Nancy E. Westcott; Patrick C. Kennedy

1989-01-01T23:59:59.000Z

92

Horizontal Divergence and Vertical Velocity Retrievals from Doppler Radar and Wind Profiler Observations  

Science Conference Proceedings (OSTI)

Vertical motion profiles can be diagnosed with the mass continuity equation using horizontal divergence fields derived from various single-Doppler radar techniques such as EVAD (extended velocity-azimuth display), CEVAD (concurrent extended ...

Robert Cifelli; Steven A. Rutledge; Dennis J. Boccippio; Thomas Matejka

1996-10-01T23:59:59.000Z

93

Investigation of the Turbulent Structure of a Cloud-Capped Mixed Layer Using Doppler Radar  

Science Conference Proceedings (OSTI)

A new method for retrieving air velocity fluctuations in the cloud-capped boundary layer (BL) using radar reflectivity and the Doppler velocity fields is proposed. The method was developed on the basis of data obtained by the Transportable ...

M. Pinsky; O. Krasnov; H. W. J. Russchenberg; A. Khain

2010-06-01T23:59:59.000Z

94

Errors in Fixed and Moving Frame of References: Applications for Conventional and Doppler Radar Analysis  

Science Conference Proceedings (OSTI)

Procedures for the estimation and correction of advection effects with single and multiple conventional and Doppler radars are developed. In the case of scalars or Cartesian vectors, the essence of the method is finding a moving frame of ...

Tzvi Gal-Chen

1982-10-01T23:59:59.000Z

95

The Structure of Thermals in Cumulus from Airborne Dual-Doppler Radar Observations  

Science Conference Proceedings (OSTI)

A newly developed technique for airborne dual-Doppler observations with the Wyoming Cloud Radar is used to characterize the velocity fields in vertical planes across cumulus turrets. The clouds sampled were continental in nature, with high bases (...

Rick Damiani; Gabor Vali; Samuel Haimov

2006-05-01T23:59:59.000Z

96

Environmental Flow Impacts on Tropical Cyclone Structure Diagnosed from Airborne Doppler Radar Composites  

Science Conference Proceedings (OSTI)

Following a recent demonstration of multicase compositing of axisymmetric tropical cyclone (TC) structure derived from airborne Doppler radar measurements, the authors extend the analysis to the asymmetric structure using an unprecedented database ...

Paul D. Reasor; Robert Rogers; Sylvie Lorsolo

2013-09-01T23:59:59.000Z

97

Improvement of Tornado Warnings by Doppler Radar Measurement of Mesocyclone Rotational Kinetic Energy  

Science Conference Proceedings (OSTI)

A significant improvement in the reliability and timeliness of tornado warnings can be achieved through quantitative measurement by Doppler radar of selected mesocyclone features. The mesocyclone, a midsize circulation found in some of the most ...

Ralph J. Donaldson Jr.; Paul R. Desrochers

1990-06-01T23:59:59.000Z

98

An Atmospheric Solitary Gust Observed with a Doppler Radar, a Tall Tower and a Surface Network  

Science Conference Proceedings (OSTI)

Doppler radar and a 444 m tall instrumented tower provide a detailed view of the kinematic and thermodynamic structure of a solitary gust. A study of the data fields, and comparison with theoretical and laboratory work leads to the conclusion ...

Richard J. Doviak; Runsheng Ge

1984-09-01T23:59:59.000Z

99

Least Squares Retrieval of Microburst Winds from Single-Doppler Radar Data  

Science Conference Proceedings (OSTI)

A least squares (LS) method is developed for retrieving low-altitude winds from single-Doppler radar scans. The method is tested with Denver airport microburst data and the results compared with the previously developed simple adjoint (SA) ...

Chong-Jian Qiu; Qin Xu

1996-06-01T23:59:59.000Z

100

Effects of Radar Proximity on Single-Doppler Velocity Signatures of Axisymmetric Rotation and Divergence  

Science Conference Proceedings (OSTI)

Geometrical and mathematical relationships are developed to explain the variation with radar range of idealized single-Doppler velocity patterns of axisymmetric rotation and divergence regions. The velocity patterns become distorted as they ...

Vincent T. Wood; Rodger A. Brown

1992-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Airflow and Precipitation Fields within Deep Alpine Valleys Observed by Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

Although airborne Doppler radar is increasingly relied upon to provide detailed descriptions of mesoscale precipitation systems in remote and complex meteorological settings, the utility of these observations has often been limited by the ...

Olivier Bousquet; Bradley F. Smull

2003-10-01T23:59:59.000Z

102

An Example of the Use of Mobile, Doppler Radar Data for Tornado Verification  

Science Conference Proceedings (OSTI)

On 16 May 2003, two ground-based, mobile, Doppler radars scanned a potentially tornadic supercell in the Texas Panhandle intermittently from 0200 to 0330 UTC. The storm likely was tornadic, but because it was dark, visual confirmation of any ...

Michael M. French; Howard B. Bluestein; Louis J. Wicker; David C. Dowell; Matthew R. Kramar

2009-06-01T23:59:59.000Z

103

Interpretation of Doppler Weather Radar Displays of Midlatitude Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

The utility of color displays of Doppler-radar data in revealing real-time kinematic information has been demonstrated in past studies, especially for extratropical cyclones and severe thunderstorms. Such displays can also indicate aspects of the ...

Robert A. Houze Jr.; M. I. Biggerstaff; S. A. Rutledge; B. F. Smull

1989-06-01T23:59:59.000Z

104

An FPGA-Based Doppler Processor for a Spaceborne Precipitation Radar  

Science Conference Proceedings (OSTI)

Measurement of precipitation Doppler velocity by spaceborne radar is complicated by the large velocity of the satellite platform. Even if successive pulses are well correlated, the velocity measurement may be biased if the precipitation target ...

S. L. Durden; M. A. Fischman; R. A. Johnson; A. J. Chu; M. N. Jourdan; S. Tanelli

2007-10-01T23:59:59.000Z

105

A Triple-Doppler Radar Analysis of a Discretely Propagating Multicell Convective Storm  

Science Conference Proceedings (OSTI)

A triple-Doppler radar case study of a regularly propagating multicell convective storm has been performed. The motion of the storm, observed on 7 June 1978 during Project NIMROD, was somewhat unusual with cell translation and propagation ...

Robert E. Peterson Jr.

1984-10-01T23:59:59.000Z

106

Recovery of Three-Dimensional Wind and Temperature Fields from Simulated Single-Doppler Radar Data  

Science Conference Proceedings (OSTI)

A method for recovering the full three-dimensional wind and temperature fields from single-Doppler radar data is developed and demonstrated. This method uses a dynamic model, and attempts to determine the initial conditions of the unobserved flow ...

Juanzhen Sun; Dawn W. Flicker; Douglas K. Lilly

1991-03-01T23:59:59.000Z

107

Real-Time Retrieval of the Wind from Aliased Velocities Measured by Doppler Radars  

Science Conference Proceedings (OSTI)

Doppler radar measurements provide the radial wind within an unambiguous interval due to the limited value of the sampling frequency (pulse repetition frequency). Many algorithms have been developed to retrieve true wind velocities from measured ...

Pierre Tabary; Georges Scialom; Urs Germann

2001-06-01T23:59:59.000Z

108

Observations of a Tropical Thunderstorm Using a Vertically Pointing, Dual-Frequency, Collinear Beam Doppler Radar  

Science Conference Proceedings (OSTI)

This paper describes an investigation of a thunderstorm that occurred in the summer of 1991 over the National Astronomy and Ionosphere Center in Arecibo, Puerto Rico. Observations were made using collinear dual-wavelength Doppler radars, which ...

P. B. Chilson; C. W. Ulbrich; M. F. Larsen; P. Perillat; J. E. Keener

1993-10-01T23:59:59.000Z

109

Significance of the Coupled Term in the Doppler Weather Radar Spectrum Width Equation  

Science Conference Proceedings (OSTI)

There is an additional zero mean random variable term that couples mean wind shear and turbulence in the Doppler radar spectrum width equation. This random variable, labeled the “coupled term,” has been neglected heretofore in the literature. ...

Ming Fang; Richard J. Doviak; Bruce A. Albrecht

2011-04-01T23:59:59.000Z

110

Polarization diversity for millimeter space-borne Doppler radars: an answer for observing deep convection?  

Science Conference Proceedings (OSTI)

Spaceborne Doppler radars have the potential to provide key missing observations of convective vertical air motions especially over the tropical oceans. Such measurements can improve our understanding of the role of tropical convection in vertical ...

Alessandro Battaglia; Simone Tanelli; Pavlos Kollias

111

Doppler Radar Study of the Trailing Anvil Region Associated with a Squall Line  

Science Conference Proceedings (OSTI)

The kinematic structure and reflectivity distribution within a region of widespread precipitation associated with a summertime midlatitude (Illinois) squall line, as revealed by an analysis of Doppler radar data, are presented and discussed. The ...

R. C. Srivastava; T. J. Matejka; T. J. Lorello

1986-02-01T23:59:59.000Z

112

Evaluation of the Hurricane Research Division Doppler Radar Analysis Software Using Synthetic Data  

Science Conference Proceedings (OSTI)

The Hurricane Research Division Doppler radar analysis software provides three-dimensional analyses of the three wind components in tropical cyclones. Although this software has been used for over a decade, there has never been a complete and in-...

Sylvie Lorsolo; John Gamache; Altug Aksoy

2013-06-01T23:59:59.000Z

113

Extended Velocity Track Display (EVTD): An Improved Processing Method for Doppler Radar Observations of Tropical Cyclones  

Science Conference Proceedings (OSTI)

The authors present an improved version of the velocity track display (VTD) method, proposed by Lee et al., to deduce the primary vortex circulation in hurricanes from airborne Doppler radar data obtained during straightline legs through the ...

Frank Roux; Frank D. Marks Jr.

1996-08-01T23:59:59.000Z

114

Diagnosing Short Term Changes in Temperature. Profiles from Single Doppler Radar Data  

Science Conference Proceedings (OSTI)

A method is outlined to diagnose temperature changes aloft from single Doppler radar data and an initial radiosonde observation. One aim is to deduce changes in inversion strength and stability between synoptic soundings, which is particularly ...

R. M. Raibin

1989-07-01T23:59:59.000Z

115

Doppler-Radar Analysis of a Tropical Cyclone over Land: Hurricane Alicia (1983) in Oklahoma  

Science Conference Proceedings (OSTI)

The center of the circulation of the remains of Hurricane Alicia passed to the west of the National Severe Storms Laboratory's Doppler radar in Norman, Oklahoma on 19 August 1983. Three types of mesoscale precipitation were noted: the central ...

Howard B. Bluestein; Dean S. Hazen

1989-11-01T23:59:59.000Z

116

Effects of Wind Field Inhomogeneities on Doppler Beam Swinging Revealed by an Imaging Radar  

Science Conference Proceedings (OSTI)

In this work, the accuracy of the Doppler beam-swinging (DBS) technique for wind measurements is studied using an imaging radar—the turbulent eddy profiler (TEP) developed by the University of Massachusetts, with data collected in summer 2003. ...

B. L. Cheong; R. D. Palmer; T-Y. Yu; K-F. Yang; M. W. Hoffman; S. J. Frasier; F. J. Lopez-Dekker

2008-08-01T23:59:59.000Z

117

Polarimetric and Dual-Doppler Radar Observations of the Lipscomb County, Texas, Supercell Thunderstorm on 23 May 2002  

Science Conference Proceedings (OSTI)

Polarimetric and dual-Doppler observations of a supercell observed by the National Center for Atmospheric Research (NCAR) S-band Polarimetric (SPOL) radar, two Doppler-On-Wheels (DOW) radars, and the Greek XPOL radar on 23 May 2002 during the ...

Jeffrey Frame; Paul Markowski; Yvette Richardson; Jerry Straka; Joshua Wurman

2009-02-01T23:59:59.000Z

118

History of Operational Use of Weather Radar by U.S. Weather Services. Part II: Development of Operational Doppler Weather Radars  

Science Conference Proceedings (OSTI)

The second part of a history of the use of storm surveillance radars by operational military and civil weather services in the United States is presented. This part describes the genesis and evolution of two operational Doppler weather radars, ...

Roger C. Whiton; Paul L. Smith; Stuart G. Bigler; Kenneth E. Wilk; Albert C. Harbuck

1998-06-01T23:59:59.000Z

119

Wind Profiling by Doppler Weather Radar Iwan Holleman (holleman@knmi.nl)  

E-Print Network (OSTI)

Wind Profiling by Doppler Weather Radar Iwan Holleman (holleman@knmi.nl) Royal Netherlands wind profiles at a high temporal resolution. Several algorithms and quality ensuring procedures for the extraction of wind profiles from radar volume data have been published. A comparison and verification

Stoffelen, Ad

120

Ensemble Kalman Filter Assimilation of Doppler Radar Data with a Compressible Nonhydrostatic Model: OSS Experiments  

Science Conference Proceedings (OSTI)

A Doppler radar data assimilation system is developed based on an ensemble Kalman filter (EnKF) method and tested with simulated radar data from a supercell storm. As a first implementation, it is assumed that the forward models are perfect and ...

Mingjing Tong; Ming Xue

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Doppler Radar Observations of the Development of a Boundary-Layer Nocturnal Jet  

Science Conference Proceedings (OSTI)

A single Doppler radar obtained detailed clear-air measurements of the development of a strong boundary-layer nocturnal jet in North Dakota during the summer of 1989. The evolution of the jet was monitored by the radar with a high degree of ...

A. Shelby Frisch; Brad W. Orr; Brooks E. Martner

1992-01-01T23:59:59.000Z

122

Real–Time Wind Synthesis from Doppler Radar Observations during the Mesoscale Alpine Programme  

Science Conference Proceedings (OSTI)

A real–time and automated multiple–Doppler analysis method for ground–based radar data, with an emphasis on observations conducted over complex terrain, is presented. It is the result of a joint effort of the radar groups of Centre National de ...

M. Chong; J-F. Georgis; O. Bousquet; S. R. Brodzik; C. Burghart; S. Cosma; U. Germann; V. Gouget; R. A. Houze Jr.; C. N. James; S. Prieur; R. Rotunno; F. Roux; J. Vivekanandan; Z-X. Zeng

2000-12-01T23:59:59.000Z

123

Mobile, Phased-Array, Doppler Radar Observations of Tornadoes at X Band  

Science Conference Proceedings (OSTI)

A mobile, phased-array Doppler radar, the Mobile Weather Radar, 2005 X-band, Phased Array (MWR-05XP), has been used since 2007 to obtain data in supercells and tornadoes. Rapidly-updating, volumetric data of tornadic vortex signatures (TVSs) ...

Michael M. French; Howard B. Bluestein; Ivan PopStefanija; Chad A. Baldi; Robert T. Bluth

124

Variational Pseudo-Multiple-Doppler Wind Retrieval in the Vertical Plane for Ground-Based Mobile Radar Data  

Science Conference Proceedings (OSTI)

A variational procedure is developed that utilizes mobile ground-based range–height indicator (RHI) Doppler radar velocity data for the synthesis of two-dimensional, RHI plane wind vectors. The radial component winds are obtained with the radar ...

Christopher C. Weiss; Howard B. Bluestein; Robert Conzemius; Evgeni Fedorovich

2007-07-01T23:59:59.000Z

125

Polarization Diversity Pulse-Pair Technique for Millimeter-WaveDoppler Radar Measurements of Severe Storm Features  

Science Conference Proceedings (OSTI)

The Polarization Diversity Pulse-Pair (PDPP) technique can extend simultaneously the maximum unambiguous range and the maximum unambiguous velocity of a Doppler weather radar. This technique has been applied using a high-resolution 95-GHz radar ...

Andrew L. Pazmany; John C. Galloway; James B. Mead; Ivan Popstefanija; Robert E. McIntosh; Howard W. Bluestein

1999-12-01T23:59:59.000Z

126

Cloud Layers, Particle Identification, and Rain-Rate Profiles from ZRVf Measurements by Clear-Air Doppler Radars  

Science Conference Proceedings (OSTI)

Networks of radars that point almost vertically and continuously measure the vertical profile of the horizontal wind will, in the future, be operated at many locations around the world. Although such radars are designed to measure the Doppler-...

E. E. Gossard; R. G. Strauch; D. C. Welsh; S. Y. Matrosov

1992-04-01T23:59:59.000Z

127

Capability of Surface-Based Clear-Air Doppler Radar for Monitoring Meteorological Structure of Elevated Layers  

Science Conference Proceedings (OSTI)

Radars and acoustic sounding systems sense properties of the turbulence structure of the atmosphere. If atmospheric turbulence can be related to the mean gradient parameters, Doppler radars and acoustic sounders can provide information about ...

Earl E. Gossard; Russell B. Chadwick; Thomas R. Detman; John Gaynor

1984-03-01T23:59:59.000Z

128

A Dual-Pulse Repetition Frequency Scheme for Mitigating Velocity Ambiguities of the NOAA P-3 Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

To mitigate some of the deleterious effects of the relatively small unambiguous Doppler velocity range (Nyquist interval) of airborne X-band Doppler radars, a technique has been developed to extend this interval. This technique, termed the batch-...

David P. Jorgensen; Tom R. Shepherd; Alan S. Goldstein

2000-05-01T23:59:59.000Z

129

Initialization of a Cloud-Resolving Model with Airborne Doppler Radar Observations of an Oceanic Tropical Convective System  

Science Conference Proceedings (OSTI)

Doppler radar–derived fields of wind and reflectivity, retrieved temperature perturbations, estimated water vapor, and cloud water contents are used to initialize a nonhydrostatic cloud-resolving model. Airborne Doppler data collected in a ...

Soline Bielli; Frank Roux

1999-06-01T23:59:59.000Z

130

In Situ, Doppler Radar, and Video Observations of the Interior Structure of a Tornado and the Wind–Damage Relationship  

Science Conference Proceedings (OSTI)

Direct observations of the winds inside a tornado were obtained with an instrumented armored vehicle, the Tornado Intercept Vehicle (TIV), and integrated with finescale mobile Doppler radar (Doppler on Wheels) data revealing, for the first time, the ...

Joshua Wurman; Karen Kosiba; Paul Robinson

2013-06-01T23:59:59.000Z

131

Procedures to Improve the Accuracy of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

The navigation correction method proposed in Testud et al. (referred to as the THL method) systematically identifies uncertainties in the aircraft Inertial Navigation System and errors in the radar-pointing angles by analyzing the radar returns ...

Brian L. Bosart; Wen-Chau Lee; Roger M. Wakimoto

2002-03-01T23:59:59.000Z

132

EnKF Assimilation of High-Resolution, Mobile Doppler Radar Data of the 4 May 2007 Greensburg, Kansas, Supercell into a Numerical Cloud Model  

Science Conference Proceedings (OSTI)

Mobile Doppler radar data, along with observations from a nearby Weather Surveillance Radar-1988 Doppler (WSR-88D), are assimilated with an ensemble Kalman filter (EnKF) technique into a nonhydrostatic, compressible numerical weather prediction ...

Robin L. Tanamachi; Louis J. Wicker; David C. Dowell; Howard B. Bluestein; Daniel T. Dawson II; Ming Xue

2013-02-01T23:59:59.000Z

133

Tropical Cyclone Kinematic Structure Retrieved from Single-Doppler Radar Observations. Part II: The GBVTD-Simplex Center Finding Algorithm  

Science Conference Proceedings (OSTI)

This paper is the second of a series and focuses on developing an algorithm to objectively identify tropical cyclone (TC) vorticity centers using single-Doppler radar data. The first paper dealt with the formulation of a single-Doppler radar TC ...

Wen-Chau Lee; Frank D. Marks Jr.

2000-06-01T23:59:59.000Z

134

Doppler Radar Signatures of Developing Thunderstorms and Their Potential to Indicate the Onset of Cloud-to-Ground Lightning  

Science Conference Proceedings (OSTI)

The capability of Doppler weather radars to short-term forecast the initiation of thunderstorms and the onset of cloud-to-ground (CG) lightning is examined. Doppler weather radar data from 28 thunderstorms were analyzed from August 1990 in the ...

Kurt D. Hondl; Michael D. Eilts

1994-08-01T23:59:59.000Z

135

Three-Dimensional Air Motions over the Baiu Front Observed by a VHF-Band Doppler Radar: A Case Study  

Science Conference Proceedings (OSTI)

Upper-tmpospheric three dimensional air motions have been observed for the first time during the Baiu period in 1984 by using a 46.5 MHz Doppler radar in Japan. This radar, called the MU radar, operates with an antenna aperture of 8330 m2 and ...

Shoichiro Fukao; Manabu D. Yamanaka; Toru Sato; Toshitaka Tsuda; Susumu Kato

1988-02-01T23:59:59.000Z

136

Retrieval of High-Resolution Wind Fields over the Southern Korean Peninsula Using the Doppler Weather Radar Network  

Science Conference Proceedings (OSTI)

The performance of a radar network for retrieving high-resolution wind fields over South Korea is examined. The network consists of a total of 18 operational radars. All of the radars possess the Doppler capability and carry out plan position ...

S-G. Park; Dong-Kyou Lee

2009-02-01T23:59:59.000Z

137

An Integrating Velocity–Azimuth Process Single-Doppler Radar Wind Retrieval Method  

Science Conference Proceedings (OSTI)

Among the single-Doppler radar wind analysis methods, the velocity–azimuth display (VAD), velocity–azimuth process (VAP), and uniform-wind (UW) methods are widely used because of their simplicity. This paper shows that the VAD, VAP, and UW ...

Xudong Liang

2007-04-01T23:59:59.000Z

138

Estimating the Most Steady Frame of Reference from Doppler Radar Data  

Science Conference Proceedings (OSTI)

A method is described to determine the most steady frame of reference of a weather system from data from one or more Doppler radars at three analysis times. The most steady frame of reference is that frame in which the velocity field displays the ...

Thomas Matejka

2002-07-01T23:59:59.000Z

139

Quality Control Algorithms for the Kennedy Space Center 50-MHz Doppler Radar Wind Profiler Winds Database  

Science Conference Proceedings (OSTI)

This paper presents the process used by the Marshall Space Flight Center Natural Environments Branch (EV44) to quality control (QC) data from the Kennedy Space Center’s 50-MHz Doppler radar wind profiler (DRWP) for use in vehicle wind loads and ...

Robert E. Barbré Jr.

2012-12-01T23:59:59.000Z

140

Unusually Long Duration, Multiple-Doppler Radar Observations of a Front in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Dual-Doppler observations acquired by a network of mobile radars deployed in the Oklahoma panhandle on 3 June 2002 are used to document the kinematic structure and evolution of a front. The data were collected during the International H2O Project ...

John R. Stonitsch; Paul M. Markowski

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Four-dimensional variational data assimilation for Doppler radar wind data  

Science Conference Proceedings (OSTI)

All forecast models, whether they represent the state of the weather, the spread of a disease, or levels of economic activity, contain unknown parameters. These parameters may be the model's initial conditions, its boundary conditions, or other tunable ... Keywords: 3D-Var, 4D-Var, Adjoint, Data assimilation, Doppler radar, NWP, Nonlinear bias, Sensitivity

Fathalla A. Rihan; Chris G. Collier; Ian Roulstone

2005-04-01T23:59:59.000Z

142

PATH TO NEXRAD: Doppler Radar Development at the National Severe Storms Laboratory  

Science Conference Proceedings (OSTI)

In this historical paper, we trace the scientific- and engineering-based steps at the National Severe Storms Laboratory (NSSL) and in the larger weather radar community that led to the development of NSSL's first 10-cm-wavelength pulsed Doppler ...

Rodger A. Brown; John M. Lewis

2005-10-01T23:59:59.000Z

143

ASSIMILATION OF DOPPLER RADAR DATA INTO NUMERICAL WEATHER MODELS  

Science Conference Proceedings (OSTI)

During the year 2008, the United States National Weather Service (NWS) completed an eight fold increase in sampling capability for weather radars to 250 m resolution. This increase is expected to improve warning lead times by detecting small scale features sooner with increased reliability; however, current NWS operational model domains utilize grid spacing an order of magnitude larger than the radar data resolution, and therefore the added resolution of radar data is not fully exploited. The assimilation of radar reflectivity and velocity data into high resolution numerical weather model forecasts where grid spacing is comparable to the radar data resolution was investigated under a Laboratory Directed Research and Development (LDRD) 'quick hit' grant to determine the impact of improved data resolution on model predictions with specific initial proof of concept application to daily Savannah River Site operations and emergency response. Development of software to process NWS radar reflectivity and radial velocity data was undertaken for assimilation of observations into numerical models. Data values within the radar data volume undergo automated quality control (QC) analysis routines developed in support of this project to eliminate empty/missing data points, decrease anomalous propagation values, and determine error thresholds by utilizing the calculated variances among data values. The Weather Research and Forecasting model (WRF) three dimensional variational data assimilation package (WRF-3DVAR) was used to incorporate the QC'ed radar data into input and boundary conditions. The lack of observational data in the vicinity of SRS available to NWS operational models signifies an important data void where radar observations can provide significant input. These observations greatly enhance the knowledge of storm structures and the environmental conditions which influence their development. As the increase in computational power and availability has made higher resolution real-time model simulations possible, the need to obtain observations to both initialize numerical models and verify their output has become increasingly important. The assimilation of high resolution radar observations therefore provides a vital component in the development and utility of numerical model forecasts for both weather forecasting and contaminant transport, including future opportunities to improve wet deposition computations explicitly.

Chiswell, S.; Buckley, R.

2009-01-15T23:59:59.000Z

144

Doppler Radar Analysis of the Northfield, Texas, Tornado of 25 May 1994  

Science Conference Proceedings (OSTI)

A large tornado was observed near Northfield, Texas, on 25 May 1994 during the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX). An analysis of the tornado and its parent storm is discussed. Doppler wind velocity spectra ...

Howard B. Bluestein; Wesley P. Unruh; David C. Dowell; Todd A. Hutchinson; Todd M. Crawford; Andrew C. Wood; Herbert Stein

1997-02-01T23:59:59.000Z

145

A New Relationship between Mean Doppler Velocity and Differential Reflectivity  

Science Conference Proceedings (OSTI)

A new relationship has been established linking the vertical mean Doppler velocity of raindrop spectra and the accompanying differential reflectivities. It is based upon the specific radar combination of a vertically pointing Doppler and a ...

Matthias Steiner

1991-06-01T23:59:59.000Z

146

A Fuzzy Logic Method for Improved Moment Estimation from Doppler Spectra  

Science Conference Proceedings (OSTI)

A new method for estimating moments from wind measurement devices that measure Doppler spectra as a function of range is presented. Quite often the spectra are contaminated by a wide variety of sources, including (but not limited to) birds, ...

Larry B. Cornman; Robert K. Goodrich; Corinne S. Morse; Warner L. Ecklund

1998-12-01T23:59:59.000Z

147

Structure and Evolution of Hurricane Claudette on 7 September 1991 from Airborne Doppler Radar Observations. Part I: Kinematics  

Science Conference Proceedings (OSTI)

On 7 September 1991, an experiment was conducted with the two National Oceanic and Atmospheric Administration (NOAA) WP-3D research aircraft to investigate the inner-core region of Hurricane Claudette. Both aircraft carried airborne Doppler radar,...

Frank Roux; Nicolas Viltard

1995-09-01T23:59:59.000Z

148

On the Use of Doppler Radar–Derived Wind Fields to Diagnose the Secondary Circulations of Tornadoes  

Science Conference Proceedings (OSTI)

A number of studies in recent years have used wind fields derived from portable Doppler radars in combination with the ground-based velocity track display (GBVTD) technique to diagnose the primary (tangential) and secondary (radial and vertical) ...

David S. Nolan

2013-04-01T23:59:59.000Z

149

Retrieval of Cloud Water and Water Vapor Contents from Doppler Radar Data in a Tropical Squall Line  

Science Conference Proceedings (OSTI)

This paper describes the retrieval of cloud water and water vapor contents from Doppler radar data. The convective part of a tropical squall line (22 June 1981) observed during the COPT 81 (Convection Profonde Tropicale 1981) West African ...

Danièle Hauser; Paul Amayenc

1986-04-01T23:59:59.000Z

150

Moving Cellular Structure of Fog Echoes Obtained with a Millimeter-Wave Scanning Doppler Radar at Kushiro, Japan  

Science Conference Proceedings (OSTI)

Observations of fogs with a millimeter-wave scanning Doppler radar were conducted at Kushiro in Hokkaido, Japan, in the summer seasons of 1999 and 2000. Three typical types of plan position indicator (PPI) displays were observed: cellular echoes ...

Akihisa Uematsu; Hiroyuki Hashiguchi; Michihiro Teshiba; Hisamichi Tanaka; Koichi Hirashima; Shoichiro Fukao

2005-08-01T23:59:59.000Z

151

Cloud-Resolving Hurricane Initialization and Prediction through Assimilation of Doppler Radar Observations with an Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

This study explores the assimilation of Doppler radar radial velocity observations for cloud-resolving hurricane analysis, initialization, and prediction with an ensemble Kalman filter (EnKF). The case studied is Hurricane Humberto (2007), the ...

Fuqing Zhang; Yonghui Weng; Jason A. Sippel; Zhiyong Meng; Craig H. Bishop

2009-07-01T23:59:59.000Z

152

Low-Wavenumber Structure and Evolution of the Hurricane Inner Core Observed by Airborne Dual-Doppler Radar  

Science Conference Proceedings (OSTI)

The asymmetric dynamics of the hurricane inner-core region is examined through a novel analysis of high temporal resolution, three-dimensional wind fields derived from airborne dual-Doppler radar. Seven consecutive composites of Hurricane Olivia’...

Paul D. Reasor; Michael T. Montgomery; Frank D. Marks Jr.; John F. Gamache

2000-06-01T23:59:59.000Z

153

Structure and Evolution of Hurricane Claudette on 7 September 1991 from Airborne Doppler Radar Observations. Part II: Thermodynamics  

Science Conference Proceedings (OSTI)

In Part I, the kinematic and precipitating fields of Hurricane Claudette have been analyzed, using airborne Doppler radar data collected on 7 September 1991 by the two National Oceanic and Atmospheric Administration (NOAA) WP-3D research ...

Nicolas Viltard; Frank Roux

1998-02-01T23:59:59.000Z

154

Multi-PRI Signal Processing for the Terminal Doppler Weather Radar. Part II: Range–Velocity Ambiguity Mitigation  

Science Conference Proceedings (OSTI)

Multiple pulse-repetition interval (multi-PRI) transmission is part of an adaptive signal transmission and processing algorithm being developed to combat range–velocity (RV) ambiguity for the Terminal Doppler Weather Radar (TDWR). In Part I of ...

John Y. N. Cho

2005-10-01T23:59:59.000Z

155

An Intense, Quasi-Steady Thunderstorm over Mountainous Terrain. Part II: Doppler Radar Observations of the Storm Morphological Structure  

Science Conference Proceedings (OSTI)

An analysis of an intense, quasi-steady thunderstorm which developed over mountainous terrain is presented. This storm, extensively analyzed using multiple Doppler radar and surface mesonet data, formed within an environment having strong low-...

Kevin R. Knupp; William R. Cotton

1982-02-01T23:59:59.000Z

156

The VDAC Technique: A Variational Method for Detecting and Characterizing Convective Vortices in Multiple-Doppler Radar Data  

Science Conference Proceedings (OSTI)

The vortex detection and characterization (VDAC) technique is designed to identify tornadoes, mesocyclones, and other convective vortices in multiple-Doppler radar data and retrieve their size, strength, and translational velocity. The technique ...

Corey K. Potvin; Alan Shapiro; Michael I. Biggerstaff; Joshua M. Wurman

2011-08-01T23:59:59.000Z

157

A Variational Analysis Method for Retrieval of Three-Dimensional Wind Field from Single-Doppler Radar Data  

Science Conference Proceedings (OSTI)

A variational method for retrieval of the three-dimensional wind field from single-Doppler radar observations is developed and tested. The method uses the conservation equation for reflectivity and the continuity equation as a constraining model. ...

Stéphane Laroche; Isztar Zawadzki

1994-09-01T23:59:59.000Z

158

Experiments of Hurricane Initialization with Airborne Doppler Radar Data for the Advanced Research Hurricane WRF (AHW) Model  

Science Conference Proceedings (OSTI)

Initialization of the hurricane vortex in weather prediction models is vital to intensity forecasts out to at least 48 h. Airborne Doppler radar (ADR) data have sufficiently high horizontal and vertical resolution to resolve the hurricane vortex ...

Qingnong Xiao; Xiaoyan Zhang; Christopher Davis; John Tuttle; Greg Holland; Patrick J. Fitzpatrick

2009-09-01T23:59:59.000Z

159

Dual-Doppler Radar Analysis of a Midlatitude Squall Line with a Trailing Region of Stratiform Rain  

Science Conference Proceedings (OSTI)

The mesoscale structure of a squall-line system that passed over Oklahoma on 22 May 1976 is investigated by dual-Doppler radar analysis. The mature storm consisted of a leading line of deep convection, which exhibited organized multicellular ...

Bradley F. Smull; Robert A. Houze Jr.

1987-08-01T23:59:59.000Z

160

Retrieval of Thermodynamic Fields from Multiple-Doppler Radar Data Using the Equations of Motion and the Thermodynamic Equation  

Science Conference Proceedings (OSTI)

A new method is proposed to determine completely the thermodynamic fields from the relative pressure and temperature perturbations, retrieved from the processing of multiple-Doppler radar data through the equations of motion. A simplified ...

Frank Roux

1985-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

The Gust-Front Detection and Wind-Shift Algorithms for the Terminal Doppler Weather Radar System  

Science Conference Proceedings (OSTI)

The Federal Aviation Administration's Terminal Doppler Weather Radar (TDWR) system was primarily designed to address the operational needs of pilots in the avoidance of low-altitude wind shears upon takeoff and landing at airports. One of the ...

Laurie G. Hermes; Arthur Witt; Steven D. Smith; Diana Klingle-Wilson; Dale Morris; Gregory J. Stumpf; Michael D. Eilts

1993-10-01T23:59:59.000Z

162

Assimilation of Satellite Infrared Radiances and Doppler Radar Observations during a Cool Season Observing System Simulation Experiment  

Science Conference Proceedings (OSTI)

An observing system simulation experiment is used to examine the impact of assimilating water vapor–sensitive satellite infrared brightness temperatures and Doppler radar reflectivity and radial velocity observations on the analysis accuracy of a ...

Thomas A. Jones; Jason A. Otkin; David J. Stensrud; Kent Knopfmeier

2013-10-01T23:59:59.000Z

163

Doppler Sodar and Radar Wind-Profiler Observations Of Gravity-Wave Activity Associated with a Gravity Current  

Science Conference Proceedings (OSTI)

Observations from two Doppler sodars and a radar wind profiler have been used in conjunction with data from a rawinsonde station and a mesoscale surface observation network to conduct a case study of a gravity current entering into an environment ...

F. M. Ralph; C. Mazaudier; M. Crochet; S. V. Venkateswaran

1993-02-01T23:59:59.000Z

164

Error Sources and Accuracy of Vertical Velocities Computed from Multiple-Doppler Radar Measurements in Deep Convective Storms  

Science Conference Proceedings (OSTI)

Actual data are used in one case to investigate the nature and source of vertical velocity errors resulting from analyses of multiple-Doppler radar measurements. Consistent with earlier analytical works, larger errors are found than would be ...

Stephan P. Nelson; Rodger A. Brown

1987-03-01T23:59:59.000Z

165

On the Performance of a Low-Cost K-Band Doppler Radar for Quantitative Rain Measurements  

Science Conference Proceedings (OSTI)

This paper deals with the ability of a vertically pointing, FM–CW Doppler radar to measure quantitatively raindrop size distributions and rainfall intensity. The wavelength of the radar is 12.5 mm (K band). To improve estimates of the rainfall ...

Martin Löffler-Mang; Michael Kunz; Willi Schmid

1999-03-01T23:59:59.000Z

166

3D-Var Assimilation of Insect-Derived Doppler Radar Radial Winds in Convective Cases Using a High-Resolution Model  

Science Conference Proceedings (OSTI)

The assimilation of Doppler radar radial winds for high-resolution NWP may improve short-term forecasts of convective weather. Using insects as the radar target, it is possible to provide wind observations during convective development. This study ...

S. J. Rennie; S. L. Dance; A. J. Illingworth; S. P. Ballard; D. Simonin

2011-04-01T23:59:59.000Z

167

Assimilation of T-TREC-Retrieved Winds from Single-Doppler Radar with an Ensemble Kalman Filter for the Forecast of Typhoon Jangmi (2008)  

Science Conference Proceedings (OSTI)

A tropical cyclone (TC) circulation Tracking Radar Echo by Correlation technique (T-TREC) developed recently is applied to derive horizontal winds from single Doppler radar reflectivity Z data (combined with radial velocity Vr data when available)...

Mingjun Wang; Ming Xue; Kun Zhao; Jili Dong

168

The Vertical Structure of a Tornado near Happy, Texas, on 5 May 2002: High-Resolution, Mobile, W-band, Doppler Radar Observations  

Science Conference Proceedings (OSTI)

A mobile, W-band Doppler radar scanned, at close range, portions of a tornado near Happy, Texas, on 5 May 2002. Simultaneous boresighted video images were also recorded, which facilitated correlating the radar-observed features of the tornado ...

Howard B. Bluestein; Christopher C. Weiss; Andrew L. Pazmany

2004-10-01T23:59:59.000Z

169

Three-Dimensional Air Circulation in a Squall Line from Airborne Dual-Beam Doppler Radar Data: A Test of Coplane Methodology Software  

Science Conference Proceedings (OSTI)

The detailed structure of a tropical squall line observed in central Florida was investigated from an airborne dual-beam Doppler radar, pointing respectively fore and aft. This allowed dual-Doppler observations from a straight flight path in a ...

Michel Chong; Jacques Testud

1996-02-01T23:59:59.000Z

170

Ka-Band ARM Zenith Radar (KAZR) Instrument Handbook  

SciTech Connect

The Ka-band ARM zenith radar (KAZR) is a zenith-pointing Doppler cloud radar operating at approximately 35 GHz. The KAZR is an evolutionary follow-on radar to ARM's widely successful millimeter-wavelength cloud radar (MMCR). The main purpose of the KAZR is to provide vertical profiles of clouds by measuring the first three Doppler moments: reflectivity, radial Doppler velocity, and spectra width. At the sites where the dual-polarization measurements are made, the Doppler moments for the cross-polarization channel are also available. In addition to the moments, velocity spectra are also continuously recorded for each range gate.

Widener, K; Bharadwaj, N; Johnson, K

2012-03-06T23:59:59.000Z

171

High-Resolution Directional Wave Spectra from Horizontally Mounted Acoustic Doppler Current Meters  

Science Conference Proceedings (OSTI)

The paper discusses the estimation of directional wave spectra by the Iterative Maximum Likelihood Method. The performance of the estimate is illustrated using data obtained by an Acoustic Doppler Current Meter in the CUrrent Measurement ...

Harald E. Krogstad; R. Lee Gordon; Martin C. Miller

1988-04-01T23:59:59.000Z

172

Remote Measurement of Turbulent Wind Spectra by Heterodyne DopplerLidar Technique  

Science Conference Proceedings (OSTI)

Heterodyne Doppler lidars (HDLs) are used to monitor atmospheric wind field and wind turbulence at remote distance. This last application calls for the derivation of wind spectra, which can be characterized by the dissipation rate and the ?-...

Philippe Drobinski; Alain M. Dabas; Pierre H. Flamant

2000-12-01T23:59:59.000Z

173

Simultaneous Measurement of Ocean Winds and Waves with an Airborne Coherent Real Aperture Radar  

Science Conference Proceedings (OSTI)

A coherent, X-band airborne radar has been developed to measure wind speed and direction simultaneously with directional wave spectra on the ocean. The coherent real aperture radar (CORAR) measures received power, mean Doppler shifts, and mean ...

William J. Plant; William C. Keller; Kenneth Hayes

2005-07-01T23:59:59.000Z

174

Observations of tornadoes and wall clouds with a portable FM-CW Doppler radar: 1989--1990 results  

SciTech Connect

The purpose of this paper is to report on our progress using a portable, 1 W,FM (frequency modulated)-CW (continuous wave) Doppler radar developed at the Los Alamos National Laboratory (LANL), to make measurements of the wind field in tornadoes and wall clouds along with simultaneous visual documentation. Results using a CW version of the radar in 1987--1988 are given in Bluestein and Unruh (1989). 18 refs., 2 figs., 1 tab.

Bluestein, H.B. (Oklahoma Univ., Norman, OK (USA). School of Meteorology); Unruh, W.P. (Los Alamos National Lab., NM (USA))

1990-01-01T23:59:59.000Z

175

On the measurement of wind speeds in tornadoes with a portable CW/FM-CW Doppler radar  

Science Conference Proceedings (OSTI)

Both the formation mechanism and structure of tornadoes are not yet well understood. The Doppler radar is probably the best remote-sensing instrument at present for determining the wind field in tornadoes. Although much has been learned about the non-supercell tornado from relatively close range using Doppler radars at fixed sites, close-range measurements in supercell tornadoes are relatively few. Doppler radar can increase significantly the number of high-resolution, sub-cloud base measurements of both the tornado vortex and its parent vortex in supercells, with simultaneous visual documentation. The design details and operation of the CW/FM-CW Doppler radar developed at the Los Alamos National Laboratory and used by storm-intercept teams at the Univ. of Oklahoma are described elsewhere. The radar transmits 1 W at 3 cm, and can be switched back and forth between CW and FM-CW modes. In the FM-CW mode the sweep repetition frequency is 15.575 kHz and the sweep width 1.9 MHz; the corresponding maximum unambiguous range and velocity, and range resolution are 5 km, {plus minus} 115 m s{sup {minus}1}, and 78 m respectively. The bistatic antennas, which have half-power beamwidths of 5{degree}, are easily pointed wit the aid of a boresighted VCR. FM-CW Data are recorded on the VCR, while voice documentation is recorded on the audio tape; video is recorded on another VCR. The radar and antennas are easily mounted on a tripod, and can be set up by three people in a minute or two. The purpose of this paper is to describe the signal processing techniques used to determine the Doppler spectrum in the FM-CW mode and a method of its interpretation in real time, and to present data gathered in a tornadic storm in 1990. 15 refs., 7 figs.

Bluestein, H.B. (Oklahoma Univ., Norman, OK (USA). School of Meteorology); Unruh, W.P. (Los Alamos National Lab., NM (USA))

1991-01-01T23:59:59.000Z

176

Mobile Doppler Radar Observations of a Tornado in a Supercell near Bassett, Nebraska, on 5 June 1999. Part I: Tornadogenesis  

Science Conference Proceedings (OSTI)

This two-part paper details an analysis of high-resolution wind and reflectivity data collected by a mobile, W-band Doppler radar: The dataset captures the near-surface life history of a tornado in a supercell in north-central Nebraska on 5 June ...

Howard B. Bluestein; Christopher C. Weiss; Andrew L. Pazmany

2003-12-01T23:59:59.000Z

177

The Retrieval of Asymmetric Tropical Cyclone Structures Using Doppler Radar Simulations and Observations with the Extended GBVTD Technique  

Science Conference Proceedings (OSTI)

The ground-based velocity track display (GBVTD) technique is extended to two Doppler radars to retrieve the structure of a tropical cyclone’s (TC’s) circulation. With this extension, it is found that the asymmetric part of the TC radial wind ...

Yu-Chieng Liou; Tai-Chi Chen Wang; Wen-Chau Lee; Ya-Ju Chang

2006-04-01T23:59:59.000Z

178

Investigations of a Winter Mountain Storm in Utah. Part III: Single-Doppler Radar Measurements of Turbulence  

Science Conference Proceedings (OSTI)

This Part III of a multipart paper deals with the analysis of turbulent motion in a winter storm, which occurred over the mountains of southwest Utah. The storm was documented with a long duration single Doppler radar dataset (21 h) comprised of ...

Bernard Campistron; Arlen W. Huggins; Alexis B. Long

1991-05-01T23:59:59.000Z

179

Observations of the Wind Field in Tornadoes, Funnel Clouds, and Wall Clouds with a Portable Doppler Radar  

Science Conference Proceedings (OSTI)

A severe-storm intercept field program was held in Oklahoma and nearby parts of Texas during the 1987–38 spring seasons. The purpose of the experiment was to use, for the first time, a low-power, portable, continuous-wave (CW), 3-cm Doppler radar ...

H. B. Bluestein; W. P. Unruh

1989-12-01T23:59:59.000Z

180

Fine Structure of Vertical Motion in the Stratiform Precipitation Region Observed by a VHF Doppler Radar Installed in Sumatra, Indonesia  

Science Conference Proceedings (OSTI)

Vertical motion W profiles in the stratiform precipitation region of mesoscale cloud clusters were investigated using wind data observed by VHF Doppler radar installed in western Sumatra Island (0.2°S, 100.32°E). A special mode for W observations ...

Noriyuki Nishi; Masayuki K. Yamamoto; Toyoshi Shimomai; Atsushi Hamada; Shoichiro Fukao

2007-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Tornadogenesis and Operational Considerations of the 11 August 1999 Salt Lake City Tornado as Seen from Two Different Doppler Radars  

Science Conference Proceedings (OSTI)

On 11 August 1999 a climatologically rare F2 tornado developed just west of downtown Salt Lake City, Utah (SLC), and moved directly through the city during the noon hour. Tornadogenesis was observed from a mountaintop WSR-88D Doppler radar 76 km (...

Lawrence B. Dunn; Steven V. Vasiloff

2001-08-01T23:59:59.000Z

182

A Variational Multiple–Doppler Radar Three-Dimensional Wind Synthesis Method and Its Impacts on Thermodynamic Retrieval  

Science Conference Proceedings (OSTI)

A multiple–Doppler radar synthesis method is developed to recover the three-dimensional wind field. In this method the solutions are obtained by variationally adjusting the winds to satisfy a series of constraints in weak formats. Among them, the ...

Yu-Chieng Liou; Ya-Ju Chang

2009-11-01T23:59:59.000Z

183

A Squall Line in Southern Germany: Kinematics and Precipitation Formation as Deduced by Advanced Polarimetric and Doppler Radar Measurements  

Science Conference Proceedings (OSTI)

A multiscale analysis of a squall line system is reported in this paper. It is shown that the squall line was initiated as part of a synoptic-scale frontal zone. The main emphasis then is on the polarimetric and Doppler radar measurements which ...

P. F. Meischner; V. N. Bringi; D. Heimann; H. Höller

1991-03-01T23:59:59.000Z

184

Polarization Radar Estimates of Raindrop Size Spectra and Rainfall Rates  

Science Conference Proceedings (OSTI)

The differential reflectivity (ZDR) measures the mean shape of hydrometeors and provides an estimate of the mean size of raindrops Observations of ZDR for rain may be combined with the conventional radar reflectivity factor (Z) and fitted to any ...

A. J. Illingworth; I. J. Caylor

1989-12-01T23:59:59.000Z

185

Measurement of Ocean Wave Directional Spectra Using Doppler Side-Scan Sonar Arrays  

Science Conference Proceedings (OSTI)

A technique is presented for extraction of ocean wave directional spectra using Doppler side-scan sonars. Two 103-kHz steerable side-scan beams from a freely drifting subsurface platform are used to estimate horizontal water surface velocity due ...

Mark V. Trevorrow

1995-06-01T23:59:59.000Z

186

Flux Measurements of Pulsating Rain with a Disdrometer and Doppler Radar during Phase II of the Joint Tropical Rain Experiment in Malaysia  

Science Conference Proceedings (OSTI)

During the Joint Tropical Rain Experiment of the Malaysian Meteorological Service and the University of Toronto, pulsating raindrop ensembles, hereafter pulses, were observed in and around Penang Island. Using a Doppler radar on 25 October 1990, ...

Greg M. McFarquhar; Roland List; David R. Hudak; Robert P. Nissen; J. S. Dobbie; N. P. Tung; T. S. Kang

1996-06-01T23:59:59.000Z

187

An Application of the Immersed Boundary Method for Recovering the Three-Dimensional Wind Fields over Complex Terrain Using Multiple-Doppler Radar Data  

Science Conference Proceedings (OSTI)

This study develops an extension of a variational-based multiple-Doppler radar synthesis method to construct the three-dimensional wind field over complex topography. The immersed boundary method (IBM) is implemented to take into account the ...

Yu-Chieng Liou; Shao-Fan Chang; Juanzhen Sun

2012-05-01T23:59:59.000Z

188

Precipitation Forecasting Using Doppler Radar Data, a Cloud Model with Adjoint, and the Weather Research and Forecasting Model: Real Case Studies during SoWMEX in Taiwan  

Science Conference Proceedings (OSTI)

The quantitative precipitation forecast (QPF) capability of the Variational Doppler Radar Analysis System (VDRAS) is investigated in the Taiwan area, where the complex topography and surrounding oceans pose great challenges to accurate rainfall ...

Sheng-Lun Tai; Yu-Chieng Liou; Juanzhen Sun; Shao-Fan Chang; Min-Chao Kuo

2011-12-01T23:59:59.000Z

189

Dynamical-Microphysical Evolution of a Convective Storm in a Weakly-Sheared Environment. Part II: Airflow and Precipitation Trajectories from Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Measurements from three Doppler radars of air motion and observations of the environment and storm reflectivity structure, supplemented by aircraft measurements of precipitation and cloud particles, are used to establish the dynamical framework ...

L. Jay Miller; James E. Dye; Brooks E. Martner

1983-09-01T23:59:59.000Z

190

A Proposed Solution to the Range–Doppler Dilemma of Weather Radar Measurements by Using the SMPRF Codes, Practical Results, and a Comparison with Operational Measurements  

Science Conference Proceedings (OSTI)

Based on the measurement principles used on incoherent scatter radars, the authors have developed the Simultaneous Multiple Pulse Repetition Frequency (SMPRF) code that is intended to solve the range–Doppler dilemma and that can be used with ...

Juha Pirttilä; Markku S. Lehtinen; Asko Huuskonen; Markku Markkanen

2005-09-01T23:59:59.000Z

191

A Variational Method for Real-Time Retrieval of Three-Dimensional Wind Field from Multiple-Doppler Bistatic Radar Network Data  

Science Conference Proceedings (OSTI)

A variational method for the retrieval of the 3D wind field from bistatic multiple-Doppler radar network data is developed, and its performance is evaluated. This bistatic network consists of one S-band weather radar and two passive low-gain ...

Alain Protat; Isztar Zawadzki

1999-04-01T23:59:59.000Z

192

Performance Characteristics of the Kennedy Space Center 50-MHz Doppler Radar Wind Profiler Using the Median Filter/First-Guess Data Reduction Algorithm  

Science Conference Proceedings (OSTI)

The performance of an improved signal-processing algorithm implemented on the NASA 50-MHz radar wind profiler at Kennedy Space Center is analyzed. In 1990, NASA began using a 50-MHz Doppler radar wind profiler to demonstrate the applicability of ...

Robin S. Schumann; Gregory E. Taylor; Francis J. Merceret; Timothy L. Wilfong

1999-05-01T23:59:59.000Z

193

Doppler Lidar (DL) Handbook  

SciTech Connect

The Doppler lidar (DL) is an active remote sensing instrument that provides range- and time-resolved measurements of radial velocity and attenuated backscatter. The principle of operation is similar to radar in that pulses of energy are transmitted into the atmosphere; the energy scattered back to the transceiver is collected and measured as a time-resolved signal. From the time delay between each outgoing transmitted pulse and the backscattered signal, the distance to the scatterer is inferred. The radial or line-of-sight velocity of the scatterers is determined from the Doppler frequency shift of the backscattered radiation. The DL uses a heterodyne detection technique in which the return signal is mixed with a reference laser beam (i.e., local oscillator) of known frequency. An onboard signal processing computer then determines the Doppler frequency shift from the spectra of the heterodyne signal. The energy content of the Doppler spectra can also be used to determine attenuated backscatter.

Newsom, RK

2012-02-13T23:59:59.000Z

194

The Coupling of Gravity Waves and Turbulence at White Sands, New Mexico, from VHF Radar Observations  

Science Conference Proceedings (OSTI)

Doppler spectra taken with the VHF Doppler radar at White Sands Missile Range are used to describe the winds and turbulence for 10 days in March?April 1991. The large power aperture product of this radar provides excellent data coverage in 150-m ...

G. D. Nastrom; F. D. Eaton

1993-01-01T23:59:59.000Z

195

Analysis of 11 june 2003 mesoscale convective vortex genesis using weather surveillance radar ??88 doppler (wsr-88d)  

E-Print Network (OSTI)

Mesoscale convective vortices (MCVs), which typically form within the stratiform rain of some mesoscale convective systems (MCSs), may persist for days, often regenerating convection daily. Long-lived MCVs can produce as much precipitation as a landfalling hurricane and lead to catastrophic flooding. The number of studies using multi-Doppler radar observations for validation of the kinematics, or three-dimensional (3-D) wind structure, of MCV genesis is limited. For this study, the Oklahoma City (KTLX) and Tulsa, Oklahoma (KINX) Weather Surveillance Radar – 1988 Doppler (WSR-88D) were used to examine the genesis of a long-lived MCV from 0000 to 0300 UTC on 11 June 2003. Traditional dual-Doppler techniques were used to determine the 3-D wind field. To relate MCV genesis within the associated larger MCS, time series of convective and stratiform precipitation, divergence, vertical vorticity, and vertical velocity were created for multiple levels within the MCS. The role of vertical vorticity generated in the convective region in MCV development was determined using vertical profiles of the terms in the vorticity tendency equation at 15 minute temporal resolution during the three hour period of investigation. The results of this study provide a detailed three hour examination for the initiation and early evolution of a long-lived MCV and can provide model validation of MCV generation.

Reynolds, Amber Elizabeth

2007-12-01T23:59:59.000Z

196

Proposal for a Spaceborne Dual-Beam Rain Radar with Doppler Capability  

Science Conference Proceedings (OSTI)

The potential characteristics and performances of a spaceborne dual-beam radar (or stereo radar) operating at 24 GHz, and devoted primarily to the retrieval of rain-rate structure by using the stereo-radar analysis, were presented in a previous ...

Paul Amayenc; Jacques Testud; Mongi Marzoug

1993-06-01T23:59:59.000Z

197

Characterization of Tornado Spectral Signatures Using Higher-Order Spectra  

Science Conference Proceedings (OSTI)

Distinct tornado spectral signatures (TSSs), which are similar to white noise spectra or have bimodal features, have been observed in both simulations and real data from Doppler radars. The shape of the tornado spectrum depends on several ...

Tian-You Yu; Yadong Wang; Alan Shapiro; Mark B. Yeary; Dusan S. Zrni?; Richard J. Doviak

2007-12-01T23:59:59.000Z

198

Modelling Solar Oscillation Power Spectra: II. Parametric Model of Spectral Lines Observed in Doppler Velocity Measurements  

E-Print Network (OSTI)

We describe a global parametric model for the observed power spectra of solar oscillations of intermediate and low degree. A physically motivated parameterization is used as a substitute for a direct description of mode excitation and damping as these mechanisms remain poorly understood. The model is targeted at the accurate fitting of power spectra coming from Doppler velocity measurements and uses an adaptive response function that accounts for both the vertical and horizontal components of the velocity field on the solar surface and for possible instrumental and observational distortions. The model is continuous in frequency, can easily be adapted to intensity measurements and extends naturally to the analysis of high-frequency pseudo modes (interference peaks at frequencies above the atmospheric acoustic cutoff).

Vorontsov, Sergei V

2013-01-01T23:59:59.000Z

199

A Mobile Rapid-Scanning X-band Polarimetric (RaXPol) Doppler Radar System  

Science Conference Proceedings (OSTI)

A novel, rapid-scanning, X-band (3-cm wavelength), polarimetric (RaXPol), mobile radar was developed for severe-weather research. The radar employs a 2.4-m-diameter dual-polarized parabolic dish antenna on a high-speed pedestal capable of rotating ...

Andrew L. Pazmany; James B. Mead; Howard B. Bluestein; Jeffrey C. Snyder; Jana B. Houser

2013-07-01T23:59:59.000Z

200

ON THE IMPACT OF SUPER RESOLUTION WSR-88D DOPPLER RADAR DATA ASSIMILATION ON HIGH RESOLUTION NUMERICAL MODEL FORECASTS  

SciTech Connect

Assimilation of radar velocity and precipitation fields into high-resolution model simulations can improve precipitation forecasts with decreased 'spin-up' time and improve short-term simulation of boundary layer winds (Benjamin, 2004 & 2007; Xiao, 2008) which is critical to improving plume transport forecasts. Accurate description of wind and turbulence fields is essential to useful atmospheric transport and dispersion results, and any improvement in the accuracy of these fields will make consequence assessment more valuable during both routine operation as well as potential emergency situations. During 2008, the United States National Weather Service (NWS) radars implemented a significant upgrade which increased the real-time level II data resolution to 8 times their previous 'legacy' resolution, from 1 km range gate and 1.0 degree azimuthal resolution to 'super resolution' 250 m range gate and 0.5 degree azimuthal resolution (Fig 1). These radar observations provide reflectivity, velocity and returned power spectra measurements at a range of up to 300 km (460 km for reflectivity) at a frequency of 4-5 minutes and yield up to 13.5 million point observations per level in super-resolution mode. The migration of National Weather Service (NWS) WSR-88D radars to super resolution is expected to improve warning lead times by detecting small scale features sooner with increased reliability; however, current operational mesoscale model domains utilize grid spacing several times larger than the legacy data resolution, and therefore the added resolution of radar data is not fully exploited. The assimilation of super resolution reflectivity and velocity data into high resolution numerical weather model forecasts where grid spacing is comparable to the radar data resolution is investigated here to determine the impact of the improved data resolution on model predictions.

Chiswell, S

2009-01-11T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Impact of 3DVAR assimilation of Doppler Weather Radar wind data and IMD observation for the prediction of a tropical cyclone  

Science Conference Proceedings (OSTI)

This study aims to investigate the impact of the Three-Dimensional Variational (3DVAR) assimilation of Doppler Weather Radar (DWR) wind data together with the India Meteorological Department (IMD) upper air and surface data for the prediction of a tropical ...

M. Govindankutty; A. Chandrasekar; Devendra Pradhan

2010-07-01T23:59:59.000Z

202

Three-Dimensional Wind Field Analysis from Dual-Doppler Radar Data. Part I: Filtering, Interpolating and Differentiating the Raw Data  

Science Conference Proceedings (OSTI)

This paper is the first of three dealing with the three-dimensional wind field analysis from dual-Doppler radar data. Here we deal with the first step of the analysis which consists in interpolating and filtering the raw radial velocity fields ...

J. Testud; M. Chong

1983-07-01T23:59:59.000Z

203

Comparison between a Three-Dimensional Simulation and Doppler Radar Data of a Tropical Squall Line: Transports of Mass, Momentum, Heat, and Moisture  

Science Conference Proceedings (OSTI)

Results from a detailed three-dimensional cloud model are extensively compared with Doppler radar data in the case of a fast-moving tropical squall line, observed during the COPT81 experiment. The comparisons use a two-dimensional statistical ...

Jean-Philippe Lafore; Jean-Luc Redelsperger; Geneviève Jaubert

1988-11-01T23:59:59.000Z

204

Three-Dimensional Wind Field Analysis from Dual-Doppler Radar Data. Part III: The Boundary Condition: An Optimum Determination Based on a Variational Concept  

Science Conference Proceedings (OSTI)

The choice of the boundary condition when integrating the air mass continuity equation, is a major problem of the 3D wind field analysis from dual (or multiple) Doppler radar data. A zero vertical velocity at ground level seems the most natural ...

M. Chong; J. Testud

1983-07-01T23:59:59.000Z

205

Finescale Doppler Radar Observation of a Tornado and Low-Level Misocyclones within a Winter Storm in the Japan Sea Coastal Region  

Science Conference Proceedings (OSTI)

Life histories of low-level misocyclones, one of which corresponded to a tornado vortex within a winter storm in the Japan Sea coastal region on 1 December 2007, were observed from close range by X-band Doppler radar of the East Japan Railway ...

Hanako Y. Inoue; Kenichi Kusunoki; Wataru Kato; Hiroto Suzuki; Toshiaki Imai; Tetsuya Takemi; Kotaro Bessho; Masahisa Nakazato; Shunsuke Hoshino; Wataru Mashiko; Syugo Hayashi; Takaaki Fukuhara; Toru Shibata; Hiroshi Yamauchi; Osamu Suzuki

2011-02-01T23:59:59.000Z

206

Dynamical and Microphysical Retrieval from Doppler Radar Observations Using a Cloud Model and Its Adjoint. Part I: Model Development and Simulated Data Experiments  

Science Conference Proceedings (OSTI)

The purpose of the research reported in this paper is to develop a variational data analysis system that can be used to assimilate data from one or more Doppler radars. In the first part of this two-part study, the technique used in this analysis ...

Juanzhen Sun; N. Andrew Crook

1997-06-01T23:59:59.000Z

207

Winds Measured by a UHF Doppler Radar and Rawinsondes: Comparisons Made on Twenty-Six Days (August-September 1977) at Arecibo, Puerto Rico  

Science Conference Proceedings (OSTI)

Vertical profiles of horizontal winds in the lower stratosphere and upper troposphere were measured by the UHF Doppler radar at Arecibo, Puerto Rico (18.35°N, 66.75°W) on 26 days in August and September 1977. On comparing these with horizontal ...

Shoichiro Fukao; Toru Sato; Norikazu Yamasaki; Robert M. Harper; Susumu Kato

1982-09-01T23:59:59.000Z

208

Ground-Based Velocity Track Display (GBVTD) Analysis of W-Band Doppler Radar Data in a Tornado near Stockton, Kansas, on 15 May 1999  

Science Conference Proceedings (OSTI)

On 15 May 1999, a storm intercept team from the University of Oklahoma collected high-resolution, W-band Doppler radar data in a tornado near Stockton, Kansas. Thirty-five sector scans were obtained over a period of approximately 10 min, ...

Robin L. Tanamachi; Howard B. Bluestein; Wen-Chau Lee; Michael Bell; Andrew Pazmany

2007-03-01T23:59:59.000Z

209

Multi-PRI Signal Processing for the Terminal Doppler Weather Radar. Part I: Clutter Filtering  

Science Conference Proceedings (OSTI)

Multiple pulse repetition interval (multi-PRI) transmission is part of an adaptive signal transmission and processing algorithm being developed to aggressively combat range–velocity ambiguity in weather radars. In the past, operational use of ...

John Y. N. Cho; Edward S. Chornoboy

2005-05-01T23:59:59.000Z

210

Cirrus Microphysical Properties and Air Motion Statistics Using Cloud Radar Doppler Moments. Part II: Climatology  

Science Conference Proceedings (OSTI)

The algorithm described in Part I has been applied to the millimeter cloud radar observations from January 1999 to December 2005 at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) and Tropical Western Pacific (...

Min Deng; Gerald G. Mace

2008-12-01T23:59:59.000Z

211

Real-Time Detection and Filtering of Chaff Clutter from Single-Polarization Doppler Radar Data  

Science Conference Proceedings (OSTI)

In countries with frequent aerial military exercises, chaff particles that are routinely spread by military aircraft represent significant noise sources for ground-based weather radar observation. In this study, a cost-effective procedure is ...

Yong Hyun Kim; Sungshin Kim; Hye-Young Han; Bok-Haeng Heo; Cheol-Hwan You

2013-05-01T23:59:59.000Z

212

Comparison of Target Detection Schemes in Doppler Radar with PSK Signals  

E-Print Network (OSTI)

of sensitive objectives and facilities (nuclear power plants, airports, warehouses, pipelines and borders Continuous Wave (FMCW) radar with Low probability of Intercept (LPI). In the paper are studied and compared

Borissova, Daniela

213

Simulated Vortex Detection Using a Four-Face Phased-Array Doppler Radar  

Science Conference Proceedings (OSTI)

The National Weather Radar Testbed was established in Norman, Oklahoma, in 2002 to evaluate, in part, the feasibility of eventually replacing mechanically scanned parabolic antennas with electronically scanned phased-array antennas on weather ...

Rodger A. Brown; Vincent T. Wood

2012-12-01T23:59:59.000Z

214

Observations of Polarimetric Signatures in Supercells by an X-Band Mobile Doppler Radar  

Science Conference Proceedings (OSTI)

Polarimetric weather radars significantly enhance the capability to infer the properties of scatterers within a resolution volume. Previous studies have identified several consistently seen polarimetric signatures in supercells observed in the ...

Jeffrey C. Snyder; Howard B. Bluestein; Vijay Venkatesh; Stephen J. Frasier

2013-01-01T23:59:59.000Z

215

Doppler Polarimetric Radar Measurements of the Gamma Drop Size Distribution of Rain  

Science Conference Proceedings (OSTI)

The conversion of radar reflections into rain intensities is dependent upon assumptions regarding the drop size distribution. The gamma drop size distribution contains three unknown parameters; the number of parameters that can be obtained ...

H. W. J. Russchenberg

1993-12-01T23:59:59.000Z

216

Accuracy of Wind Fields Observed by a Bistatic Doppler Radar Network  

Science Conference Proceedings (OSTI)

The accuracy of wind vectors derived from bistatic dual-Doppler synthesis was investigated. The investigation was based on mathematical examinations and observation data analyses in both convective and stratiform cases. Accurate wind vectors were ...

Shinsuke Satoh; Joshua Wurman

2003-08-01T23:59:59.000Z

217

Systematic Phase Codes for Resolving Range Overlaid Signals in a Doppler Weather Radar  

Science Conference Proceedings (OSTI)

This paper deals with the recovery of Doppler velocities in the presence of range overlaid echoes. Transmitted pulses are phase shifted to tag the echoes from scatterers, which are separated by the unambiguous range. A new systematic phase code ...

M. Sachidananda; Dusan S. Zrnic

1999-10-01T23:59:59.000Z

218

The Life Cycle of Thunderstorm Gust Fronts as Viewed with Doppler Radar and Rawinsonde Data  

Science Conference Proceedings (OSTI)

This paper presents the time-dependent analysis of the thunderstorm gust front with the use of Project NIMROD data. RHI cross sections of reflectivity and Doppler velocity are constructed to determine the entire vertical structure. The life cycle ...

Roger M. Wakimoto

1982-08-01T23:59:59.000Z

219

Multiple-Doppler Radar Observations of the Evolution of Vorticity Extrema in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Overdetermined, dual-Doppler wind syntheses are used to document the evolution, structure, and dynamics of vertical vorticity extrema observed in a convective boundary layer during the 12 June 2002 International H2O Project (IHOP) mission. ...

Paul Markowski; Christina Hannon

2006-01-01T23:59:59.000Z

220

Humidity Gradient Profiles from Wind Profiling Radars Using the NOAA/ETL Advanced Signal Processing System (SPS)  

Science Conference Proceedings (OSTI)

An algorithm to compute the magnitude of humidity gradient profiles from the measurements of the zeroth, first, and second moments of wind profiling radar (WPR) Doppler spectra was developed and tested. The algorithm extends the National Oceanic ...

B. Boba Stankov; Earl E. Gossard; Bob L. Weber; Richard J. Lataitis; Allen B. White; Daniel E. Wolfe; David C. Welsh; Richard G. Strauch

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

HIGH SPECTRAL RESOLUTION LIDAR EMULATION VIA DOPPLER CLOUD RADAR SPECTRUM PROCESSING AND ITS IMPLICATIONS FOR  

E-Print Network (OSTI)

targeting the liquid, and radar, the ice. Depolarization measurements can assist in resolving phase to identify liquid, ice, and mixed-phase clouds. __________ NOTICE: This manuscript has been authored IMPLICATIONS FOR CLOUD PHASE IDENTIFICATION E. Luke, P. Kollias, and M. Shupe Presented at the American

222

Single-Doppler Velocity Retrieval with Rapid-Scan Radar Data  

Science Conference Proceedings (OSTI)

An approximate (rapid scan) dynamical model for single-Doppler retrieval of the vector wind field is investigated. This approximate model is based on the Lagrangian form of the radial component of the equation of motion and is valid for retrieval ...

Alan Shapiro; Paul Robinson; Joshua Wurman; Jidong Gao

2003-12-01T23:59:59.000Z

223

Doppler-Radar Analysis of a Low-Precipitation Severe Storm  

Science Conference Proceedings (OSTI)

This is a detailed study of the structure and evolution of a convective storm that formed along the dryline in Oklahoma on 26 April 1984 and developed into a supercell. Dual-Doppler wind analyses, analyses of surface-mesonetwork and instrumented-...

Howard B. Bluestein; Gary R. Woodall

1990-08-01T23:59:59.000Z

224

Organization and Structure of Clouds and Precipitation on the Mid-Atlantic Coast of the United States. Part IV: Retrieval of the Thermodynamic and Cloud Microphysical Structures of a Frontal Rainband from Doppler Radar Data  

Science Conference Proceedings (OSTI)

The thermodynamic and cloud structure of a relatively weak wintertime frontal rainband are derived from dual-Doppler radar measurements, soundings and high resolution surface observations, and with a cloud model. These derivations are simplified ...

Bart Geerts; Peter V. Hobbs

1991-05-01T23:59:59.000Z

225

Radar Observations of Updrafts, Downdrafts, and Turbulence in Fair-Weather Cumuli  

Science Conference Proceedings (OSTI)

Observations from a 94-GHz radar are used to define the vertical structure of marine fair-weather cumuli. Doppler spectra obtained from the radar provide mean vertical velocities as well as detailed spectral shapes that can be used to infer small-...

P. Kollias; B. A. Albrecht; R. Lhermitte; A. Savtchenko

2001-07-01T23:59:59.000Z

226

Detection of supercooled liquid in mixedphase clouds using radar Doppler spectra  

E-Print Network (OSTI)

in the temperature range from 0 to -40°C, where both liquid and ice hydrometeor phases are sustainable of their hydrometeors (i.e., liquid or ice). Current cloud parameterizations that parti- tion water into liquid and ice 2010; published 1 October 2010. [1] Cloud phase identification from active remote sensors

Shupe, Matthew

227

The Refractive Index Spectra within Clouds from Forward-Scatter Radar Observations  

Science Conference Proceedings (OSTI)

When long-wavelength radars are used to observe the atmosphere, there are occasions when radar return from a volume of cloud is unexpectedly large relative to that predicted by the classical incoherent scatter from individual cloud droplets. The ...

Earl E. Gossard; Richard G. Strauch

1981-02-01T23:59:59.000Z

228

An Efficient Dual-Resolution Approach for Ensemble Data Assimilation and Tests with Simulated Doppler Radar Data  

Science Conference Proceedings (OSTI)

A new efficient dual-resolution (DR) data assimilation algorithm is developed based on the ensemble Kalman filter (EnKF) method and tested using simulated radar radial velocity data for a supercell storm. Radar observations are assimilated on ...

Jidong Gao; Ming Xue

2008-03-01T23:59:59.000Z

229

1230 MONTHLY WEATHER REVIEW VOLUME 137 Using a Low-Order Model to Detect and Characterize Tornadoes in Multiple-Doppler Radar Data  

E-Print Network (OSTI)

A new multiple-Doppler radar analysis technique is presented for the objective detection and characterization of tornado-like vortices. The technique consists of fitting radial wind data from two or more radars to a simple analytical model of a vortex and its near-environment. The model combines a uniform flow, linear shear flow, linear divergence flow (all of which compose a broadscale flow), and a modified combined Rankine vortex (representing the tornado). The vortex and its environment are allowed to translate. The parameters in the low-order model are determined by minimizing a cost function that accounts for the discrepancy between the model and observed radial winds. Since vortex translation is taken into account, the cost function can be evaluated over time as well as space, and thus the observations can be used at the actual times and locations where they were acquired. The technique is first tested using analytically simulated observations whose wind field and error characteristics are systematically varied. An Advanced Regional Prediction System (ARPS) high-resolution numerical simulation of a supercell and associated tornado is then used to emulate an observation dataset. The method is tested with two virtual radars for several radarsampling strategies. Finally, the technique is applied to a dataset of real dual-Doppler observations of a tornado that struck central Oklahoma on 8 May 2003. The method shows skill in retrieving the tornado path and radar-grid-scale features of the horizontal wind field in the vicinity of the tornado. The best results are obtained using a two-step procedure in which the broadscale flow is retrieved first. 1.

Corey K. Potvin; Alan Shapiro; Tian-you Yu; Jidong Gao; Ming Xue

2007-01-01T23:59:59.000Z

230

Waterspout Velocity Measurements by Airborne Doppler Lidar  

Science Conference Proceedings (OSTI)

A Doppler lidar measures the line-of-sight velocity of cloud droplets in a waterspout much as a meteorological Doppler radar measures the velocity of larger hydrometeors. We discuss details of the application of an airborne Doppler lidar to ...

R. L. Schwiesow; R. E. Cupp; P. C. Sinclair; R. F. Abbey Jr.

1981-04-01T23:59:59.000Z

231

A Proposal of Pulse-Pair Doppler Operation on a Spaceborne Cloud-Profiling Radar in the W Band  

Science Conference Proceedings (OSTI)

Pulse-pair Doppler operation is considered for the spaceborne mission. In a formalism, the condition that a measured Doppler velocity on pulse-pair operation corresponds to that on the FFT operation is derived. The coherent coupling effect of the ...

Satoru Kobayashi; Hiroshi Kumagai; Hiroshi Kuroiwa

2002-09-01T23:59:59.000Z

232

Assimilating Airborne Doppler Radar Observations with an Ensemble Kalman Filter for Convection-Permitting Hurricane Initialization and Prediction: Katrina (2005)  

Science Conference Proceedings (OSTI)

Through a Weather Research and Forecasting model (WRF)-based ensemble Kalman filter (EnKF) data assimilation system, the impact of assimilating airborne radar observations for the convection-permitting analysis and prediction of Hurricane Katrina (...

Yonghui Weng; Fuqing Zhang

2012-03-01T23:59:59.000Z

233

Tornado Damage Estimation Using Polarimetric Radar  

Science Conference Proceedings (OSTI)

This study investigates the use of tornadic debris signature (TDS) parameters to estimate tornado damage severity using Norman, Oklahoma (KOUN), polarimetric radar data (polarimetric version of the Weather Surveillance Radar-1988 Doppler radar). ...

David J. Bodine; Matthew R. Kumjian; Robert D. Palmer; Pamela L. Heinselman; Alexander V. Ryzhkov

2013-02-01T23:59:59.000Z

234

SWIMSAT: A Real-Aperture Radar to Measure Directional Spectra of Ocean Waves from Space—Main Characteristics and Performance Simulation  

Science Conference Proceedings (OSTI)

The project SWIMSAT aims to measure the directional spectra of waves from space using a real-aperture radar with a low-incidence, conical-scanning beam. This system’s design is based on airborne versions developed in France and the United States. ...

Danièle Hauser; Elbatoul Soussi; Eric Thouvenot; Laurent Rey

2001-03-01T23:59:59.000Z

235

Vibrational spectra of nanowires measured using laser doppler vibrometry and STM studies of epitaxial graphene : an LDRD fellowship report.  

Science Conference Proceedings (OSTI)

A few of the many applications for nanowires are high-aspect ratio conductive atomic force microscope (AFM) cantilever tips, force and mass sensors, and high-frequency resonators. Reliable estimates for the elastic modulus of nanowires and the quality factor of their oscillations are of interest to help enable these applications. Furthermore, a real-time, non-destructive technique to measure the vibrational spectra of nanowires will help enable sensor applications based on nanowires and the use of nanowires as AFM cantilevers (rather than as tips for AFM cantilevers). Laser Doppler vibrometry is used to measure the vibration spectra of individual cantilevered nanowires, specifically multiwalled carbon nanotubes (MWNTs) and silver gallium nanoneedles. Since the entire vibration spectrum is measured with high frequency resolution (100 Hz for a 10 MHz frequency scan), the resonant frequencies and quality factors of the nanowires are accurately determined. Using Euler-Bernoulli beam theory, the elastic modulus and spring constant can be calculated from the resonance frequencies of the oscillation spectrum and the dimensions of the nanowires, which are obtained from parallel SEM studies. Because the diameters of the nanowires studied are smaller than the wavelength of the vibrometer's laser, Mie scattering is used to estimate the lower diameter limit for nanowires whose vibration can be measured in this way. The techniques developed in this thesis can be used to measure the vibrational spectra of any suspended nanowire with high frequency resolution Two different nanowires were measured - MWNTs and Ag{sub 2}Ga nanoneedles. Measurements of the thermal vibration spectra of MWNTs under ambient conditions showed that the elastic modulus, E, of plasma-enhanced chemical vapor deposition (PECVD) MWNTs is 37 {+-} 26 GPa, well within the range of E previously reported for CVD-grown MWNTs. Since the Ag{sub 2}Ga nanoneedles have a greater optical scattering efficiency than MWNTs, their vibration spectra was more extensively studied. The thermal vibration spectra of Ag{sub 2}Ga nanoneedles was measured under both ambient and low-vacuum conditions. The operational deflection shapes of the vibrating Ag{sub 2}Ga nanoneedles was also measured, allowing confirmation of the eigenmodes of vibration. The modulus of the crystalline nanoneedles was 84.3 {+-} 1.0 GPa. Gas damping is the dominate mechanism of energy loss for nanowires oscillating under ambient conditions. The measured quality factors, Q, of oscillation are in line with theoretical predictions of air damping in the free molecular gas damping regime. In the free molecular regime, Q{sub gas} is linearly proportional to the density and diameter of the nanowire and inversely proportional to the air pressure. Since the density of the Ag{sub 2}Ga nanoneedles is three times that of the MWNTs, the Ag{sub 2}Ga nanoneedles have greater Q at atmospheric pressures. Our initial measurements of Q for Ag{sub 2}Ga nanoneedles in low-vacuum (10 Torr) suggest that the intrinsic Q of these nanoneedles may be on the order of 1000. The epitaxial carbon that grows after heating (000{bar 1}) silicon carbide (SiC) to high temperatures (1450-1600) in vacuum was also studied. At these high temperatures, the surface Si atoms sublime and the remaining C atoms reconstruct to form graphene. X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) were used to characterize the quality of the few-layer graphene (FLG) surface. The XPS studies were useful in confirming the graphitic composition and measuring the thickness of the FLG samples. STM studies revealed a wide variety of nanometer-scale features that include sharp carbon-rich ridges, moire superlattices, one-dimensional line defects, and grain boundaries. By imaging these features with atomic scale resolution, considerable insight into the growth mechanisms of FLG on the carbon-face of SiC is obtained.

Biedermann, Laura Butler

2009-09-01T23:59:59.000Z

236

Impacts of Beam Broadening and Earth Curvature on Storm-Scale 3D Variational Data Assimilation of Radial Velocity with Two Doppler Radars  

Science Conference Proceedings (OSTI)

The radar ray path and beam broadening equations are important for assimilation of radar data into numerical weather prediction (NWP) models. They can be used to determine the physical location of each radar measurement and to properly map the ...

Guoqing Ge; Jidong Gao; Keith Brewster; Ming Xue

2010-04-01T23:59:59.000Z

237

An Integrated Display and Analysis Methodology for Multivariable Radar Data  

Science Conference Proceedings (OSTI)

Polarimetric Doppler radars provide valuable information about the kinematic and microphysical structure of storms. However, in-depth analysis using radar products, such as Doppler-derived wind vectors and hydrometeor identification, has been ...

Brenda A. Dolan; Steven A. Rutledge

2007-08-01T23:59:59.000Z

238

Strengths and Limitations of Current Radar Systems for Two Stakeholder Groups in the Southern Plains  

Science Conference Proceedings (OSTI)

Advancements in radar technology since the deployment of the Weather Surveillance Radar-1988 Doppler (WSR-88D) network have prompted consideration of radar replacement technologies. In order for the outcomes of advanced radar research and ...

Daphne S. LaDue; Pamela L. Heinselman; Jennifer F. Newman

2010-07-01T23:59:59.000Z

239

The Removal of Turbulent Broadening in Radar Doppler Spectra Using Linear Inversion with Double-Sided Constraints  

Science Conference Proceedings (OSTI)

Remote sensing instruments have the ability to collect data over extensive temporal periods and spatial regions. A common thread between all these sensors is the need to relate the measured quantity to a meaningful observation of a system ...

David M. Babb; Johannes Verlinde; Bert W. Rust

2000-12-01T23:59:59.000Z

240

Millimeter Wave Cloud Radar (MMCR) Handbook  

SciTech Connect

The millimeter cloud radar (MMCR) systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing radar that operates at a frequency of 35 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar will also report radar reflectivity (dBZ) of the atmosphere up to 20 km. The radar possesses a doppler capability that will allow the measurement of cloud constituent vertical velocities.

KB Widener; K Johnson

2005-01-30T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Radar Detection of Turbulence in Precipitation Environments  

Science Conference Proceedings (OSTI)

Imperfect particle tracer response is incorporated into the relations describing the turbulent air motion contribution to Doppler radar spectrum mean and variance. Tracer effects on radar estimates of the eddy dissipation rate (?) increase with ...

Alan R. Bohne

1982-08-01T23:59:59.000Z

242

Understanding Radar Refractivity: Sources of Uncertainty  

Science Conference Proceedings (OSTI)

This study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (“Mesonet”) and sounding measurements and discusses some challenges to implementing radar ...

David Bodine; Dan Michaud; Robert D. Palmer; Pamela L. Heinselman; Jerry Brotzge; Nick Gasperoni; Boon Leng Cheong; Ming Xue; Jidong Gao

2011-12-01T23:59:59.000Z

243

Optimal Planning of a Weather Radar Network  

Science Conference Proceedings (OSTI)

An approach to the optimal planning of a weather radar network is presented. In the approach, several aspects affecting the planning decision, including terrain blockage, the need to measure with two Doppler weather radars in some regions, and ...

R. Minciardi; R. Sacile; F. Siccardi

2003-09-01T23:59:59.000Z

244

Transverse and Longitudinal Doppler Effects of the Sunbeam Spectra and Earth-Self Rotation and Orbital Velocities, the Mass of the Sun and Others  

E-Print Network (OSTI)

The transverse and longitudinal Doppler effects of the sunbeam spectra are shown to result in the earth parameters such as the earth-self rotation and revolution velocities, the earth orbit semi-major axis, the earth orbital angular momentum, the earth axial tilt, the earth orbit eccentricity, the local latitude and the mass of the sun. The sunbeam global positioning scheme is realized, including the earth orbital position. PACS numbers: 91.10.Fc, 95.10.Km, 91.10.Da, 91.10.Jf.

Sang Boo Nam

2009-11-17T23:59:59.000Z

245

Oscillations in Mesocyclone Signatures with Range Owing to Azimuthal Radar Sampling  

Science Conference Proceedings (OSTI)

When a thunderstorm mesocyclone changes range relative to a Doppler radar, the deduced core diameter and mean rotational velocity of the Doppler velocity mesocyclone signature oscillate back and forth, even though the radar beam’s physical width ...

Vincent T. Wood; Rodger A. Brown

2000-01-01T23:59:59.000Z

246

Efficient Dealiasing of Doppler Velocities Using Local Environment Constraints  

Science Conference Proceedings (OSTI)

A Doppler velocity dealiasing algorithm is described that processes one radial at a time by comparing that radial with a previous radial. This technique has worked reliably on numerous Doppler radar datasets for clear air, thunderstorm, and ...

Michael D. Eilts; Steven D. Smith

1990-02-01T23:59:59.000Z

247

Helicopter discrimination apparatus for the murine radar  

DOE Patents (OSTI)

A helicopter discrimination apparatus for a radar utilizing doppler filtering to discriminate between a missile and ground clutter. The short duration of the doppler filter pulses which are emitted by helicopter rotor blades are processed to prevent false alarms, thus allowing the radar-protected helicopter to operate in formation with other helicopters while maintaining protection against infra-red-seeking missiles.

Webb, Jr., John G. (Sandia Park, NM); Gray, Roger M. (Dallas, TX)

1977-01-01T23:59:59.000Z

248

W-band ARM Cloud Radar (WACR) Update and Status  

NLE Websites -- All DOE Office Websites (Extended Search)

W-band ARM Cloud Radar (WACR) Update and Status W-band ARM Cloud Radar (WACR) Update and Status PopStefanija, Ivan ProSensing, Inc. Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory Category: Instruments Two W-band ARM Cloud Radars (WACR) have been developed for the SGP and the ARM Mobile Facility (AMF) by ProSensing. The SGP WACR was successfully deployed in the same shelter as the MMCR in 2005. It is currently collecting co-polarization and cross-polarization spectral moments (reflectivity, Doppler velocity, and spectral width) along with spectra data. The AMF WACR will be deployed with the AMF in Niamey, Niger early in 2006. We will present ingested WACR data formats available from the ARM Archive, a selected comparisons of WACR and MMCR data at SGP, and data from

249

Weather Radar Polarimetry-Trends Toward Operational Applications  

Science Conference Proceedings (OSTI)

This is a version of a speech presented at the 27th Conference on Radar Meteorology. Relative advantages of polarimetry are contrasted with the advantages accrued by the introduction of radar into meteorology and by the addition of Doppler ...

Dušan S. Zrni?

1996-07-01T23:59:59.000Z

250

Evaluation of a 35 GHz Radar for Cloud Physics Research  

Science Conference Proceedings (OSTI)

A 1960 35 GHz radar has been modernized through the use of solid state electronics, Dopplerization and improved data-display capabilities. Radars of this frequency are particularly useful for observing the internal structures of clouds and for ...

Peter V. Hobbs; Nathan T. Funk; Richard R. Weiss Sr.; John D. Locatelli; Kumud R. Biswas

1985-03-01T23:59:59.000Z

251

Radar Observations of the 3 May 1999 Oklahoma City Tornado  

Science Conference Proceedings (OSTI)

The 3 May 1999 Oklahoma City storm is unique from a weather radar perspective because a long-track violent tornado passed within close range of several Doppler radars, because a detailed damage survey was conducted immediately after the event, ...

Donald W. Burgess; Michael A. Magsig; Joshua Wurman; David C. Dowell; Yvette Richardson

2002-06-01T23:59:59.000Z

252

Rapid Sampling of Severe Storms by the National Weather Radar Testbed Phased Array Radar  

Science Conference Proceedings (OSTI)

A key advantage of the National Weather Radar Testbed Phased Array Radar (PAR) is the capability to adaptively scan storms at higher temporal resolution than is possible with the Weather Surveillance Radar-1988 Doppler (WSR-88D): 1 min or less ...

Pamela L. Heinselman; David L. Priegnitz; Kevin L. Manross; Travis M. Smith; Richard W. Adams

2008-10-01T23:59:59.000Z

253

Investigation of a Severe Downburst Storm near Phoenix, Arizona, as Seen by a Mobile Doppler Radar and the KIWA WSR-88D  

Science Conference Proceedings (OSTI)

A Shared Mobile Atmospheric Research and Teaching Radar (SMART-R) was deployed near Phoenix, Arizona, during the summer of 2004. The goal was to capture a severe microburst at close range to understand the low-altitude wind structure and ...

Steven V. Vasiloff; Kenneth W. Howard

2009-06-01T23:59:59.000Z

254

Constructing Three-Dimensional Multiple-Radar Reflectivity Mosaics: Examples of Convective Storms and Stratiform Rain Echoes  

Science Conference Proceedings (OSTI)

The advent of Internet-2 and effective data compression techniques facilitates the economic transmission of base-level radar data from the Weather Surveillance Radar-1988 Doppler (WSR-88D) network to users in real time. The native radar spherical ...

Jian Zhang; Kenneth Howard; J. J. Gourley

2005-01-01T23:59:59.000Z

255

Impact of CASA Radar and Oklahoma Mesonet Data Assimilation on the Analysis and Prediction of Tornadic Mesovortices in an MCS  

Science Conference Proceedings (OSTI)

The impact of radar and Oklahoma Mesonet data assimilation on the prediction of mesovortices in a tornadic mesoscale convective system (MCS) is examined. The radar data come from the operational Weather Surveillance Radar-1988 Doppler (WSR-88D) ...

Alexander D. Schenkman; Ming Xue; Alan Shapiro; Keith Brewster; Jidong Gao

2011-11-01T23:59:59.000Z

256

Direct Measurements of Vertical-Velocity Power Spectra with the Sousy-VHF-Radar Wind Profiler System  

Science Conference Proceedings (OSTI)

We present power spectra of vertical velocities measured with the SOUSY-VHF-Radax wind profiler.over a 5-day period in October and November 1981. Most of the data consist of hourly vertical velocity profiles based on 12-rain averages, but, for ...

M. F. Larsen; J. Rutger; D. N. Holden

1987-12-01T23:59:59.000Z

257

High-Resolution Dual-Doppler Analyses of the 29 May 2001 Kress, Texas, Cyclic Supercell  

Science Conference Proceedings (OSTI)

On 29 May 2001, Doppler on Wheels radars collected data on a supercell near Kress, Texas. The supercellular storm, cyclic in nature, produced multiple mesocyclones throughout its lifetime. Dual-Doppler syntheses were conducted using a grid ...

Jeffrey R. Beck; John L. Schroeder; Joshua M. Wurman

2006-11-01T23:59:59.000Z

258

Comparison of Radar Reflectivity and Vertical Velocity Observed with a Scannable C-Band Radar and Two UHF Profilers in the Lower Troposphere  

Science Conference Proceedings (OSTI)

A C-band meteorological Doppler radar has been used to investigate the dynamic processes and the coherent organizations within a clear air atmospheric boundary layer (ABL). Depending on the atmospheric conditions, this moderate sensitive radar ...

M. Lothon; B. Campistron; S. Jacoby-Koaly; B. Bénech; F. Lohou; F. Girard-Ardhuin

2002-06-01T23:59:59.000Z

259

Thunderstorm characteristics of cloud-to-ground lightning at the Kennedy Space Center, Florida: a study of lightning initiation signatures as indicated by Doppler radar  

E-Print Network (OSTI)

A sum-nary of lightning characteristics was developed for the NASA Kennedy Space Center (KSC). From-n a 1989-1996 data set, the spatial patterns, temporal patterns, and first stroke mean peak current were analyzed. Forty five thunderstorms were chosen due to their isolated development over KSC. Forty of the storms representing summer (May through September) airmass thunderstorms and five storms representing winter were examined for their storms-n initiation characteristics. Radar reflectivity echoes at the -10 C,-15 C, and-20 C temperature heights were associated with cloud-to-ground (CG) lightning strike locations from the National Lightning Detection Network. A distinct region of high ground flash densities can be seen over land matching the topography of the KSC coastline. A maximum of values was observed during the summer months for both negative and positive flashes. The absolute i-magnitude of negative peak currents was found to be higher than positive peak currents in Florida. Although thunderstorms can Occur at any time during the day, the diurnal distribution of lightning flashes showed that the afternoon (2000-2200 UTC) was the time of maximum lightning activity. From a time history of radar-echoes, it was found that the 30 dBZ echo detected at the-I 5'C temperature height is the best indicator of the beginning of CG lightning activity. The observed median lag time between this lightning initiation signature and the beginning of CG lightning flashes was 15.5 minutes. Other lightning initiation signatures were also examined at all three temperature heights and did not yield as successful results.

Gremillion, Michael Shane

1998-01-01T23:59:59.000Z

260

Quality Assessment of Weather Radar Wind Profiles during Bird Migration  

Science Conference Proceedings (OSTI)

Wind profiles from an operational C-band Doppler radar have been combined with data from a bird tracking radar to assess the wind profile quality during bird migration. The weather radar wind profiles (WRWPs) are retrieved using the well-known ...

Iwan Holleman; Hans van Gasteren; Willem Bouten

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

DOW Radar Observations of Wind Farms  

Science Conference Proceedings (OSTI)

The growth of the wind industry in recent years has motivated investigation into wind farm interference with the operation of the nationwide Weather Surveillance Radar-1988 Doppler (WSR-88D) network. Observations of a wind farm were taken with a Doppler ...

Mallie Toth; Erin Jones; Dustin Pittman; David Solomon

2011-08-01T23:59:59.000Z

262

Radar Echo Structure, Air Motion and Hail Formation in a Large Stationary Multicellular Thunderstorm  

Science Conference Proceedings (OSTI)

Observations from aircraft, Doppler radars, surface mesonetwork, upper air network and surveillance radar are used to describe the structure and evolution of a large rain and hailstorm that occurred on 22 June 1976 in northeastern Colorado. In ...

L. J. Miller; J. C. Fankhauser

1983-10-01T23:59:59.000Z

263

Objective Optimization of Weather Radar Networks for Low-Level Coverage Using a Genetic Algorithm  

Science Conference Proceedings (OSTI)

The current Weather Surveillance Radar-1988 Doppler (WSR-88D) radar network is approaching 20 years of age, leading researchers to begin exploring new opportunities for a next-generation network in the United States. With a vast list of ...

James M. Kurdzo; Robert D. Palmer

2012-06-01T23:59:59.000Z

264

The Joint Polarization Experiment: Polarimetric Radar in Forecasting and Warning Decision Making  

Science Conference Proceedings (OSTI)

To test the utility and added value of polarimetric radar products in an operational environment, data from the Norman, Oklahoma (KOUN), polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) were delivered to the National Weather Service ...

Kevin A. Scharfenberg; Daniel J. Miller; Terry J. Schuur; Paul T. Schlatter; Scott E. Giangrande; Valery M. Melnikov; Donald W. Burgess; David L. Andra Jr.; Michael P. Foster; John M. Krause

2005-10-01T23:59:59.000Z

265

Spatially Variable Advection Correction of Radar Data. Part II: Test Results  

Science Conference Proceedings (OSTI)

The spatially variable advection-correction/analysis procedure introduced in Part I is tested using analytical reflectivity blobs embedded in a solid-body vortex, and Terminal Doppler Weather Radar (TDWR) and Weather Surveillance Radar-1988 ...

Alan Shapiro; Katherine M. Willingham; Corey K. Potvin

2010-11-01T23:59:59.000Z

266

The Turbulence Structure in a Continental Stratocumulus Cloud from Millimeter-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

The turbulent-scale vertical velocity structure in a continental stratocumulus cloud is studied using a 3-mm wavelength Doppler radar operating in a vertically pointing mode. The radar observations provided 30-m sampling in the vertical with 2-s ...

Pavlos Kollias; Bruce Albrecht

2000-08-01T23:59:59.000Z

267

Prognostic Equation for Radar Radial Velocity Derived by Considering Atmospheric Refraction and Earth Curvature  

Science Conference Proceedings (OSTI)

The prognostic equation for the radial velocity field observed with a Doppler radar is derived to include the effects of atmospheric refraction and earth curvature on radar-beam height and slope angle. The derived equation, called the radial ...

Qin Xu; Li Wei

2013-10-01T23:59:59.000Z

268

Studies of Precipitation Processes in the Troposphere Using an FM-CW Radar  

Science Conference Proceedings (OSTI)

In the field of FM-CW tropospheric radar, new breakthroughs have become possible due to progress in FM-CW radar hardware, in FM-CW radar signal processing and in the availability of the Doppler polarimetric FM-CW radar DARR. DARR has a high ...

L. P. Ligthart; L. R. Nieuwkerk

1989-10-01T23:59:59.000Z

269

A Real-Time, Three-Dimensional, Rapidly Updating, Heterogeneous Radar Merger Technique for Reflectivity, Velocity, and Derived Products  

Science Conference Proceedings (OSTI)

With the advent of real-time streaming data from various radar networks, including most Weather Surveillance Radars-1988 Doppler and several Terminal Doppler Weather Radars, it is now possible to combine data in real time to form 3D multiple-...

Valliappa Lakshmanan; Travis Smith; Kurt Hondl; Gregory J. Stumpf; Arthur Witt

2006-10-01T23:59:59.000Z

270

Sidelobe Contamination in Bistatic Radars  

Science Conference Proceedings (OSTI)

The problem of sidelobe contamination in a bistatic network is explored. The McGill bistatic network consists of one S-band Doppler radar and two low-gain passive receivers at remote sites. Operational experience with the bistatic network ...

Ramón de Elía; Isztar Zawadzki

2000-10-01T23:59:59.000Z

271

Performance of Maximum Likelihood Estimators of Mean Power and Doppler Velocity with A Priori Knowledge of Spectral Width  

Science Conference Proceedings (OSTI)

The performance of the maximum likelihood (ML) estimates of mean velocity and signal power for Doppler radar and Doppler lidar, assuming known signal spectral width, is presented. The results are compared with the theoretical limit of the Cramer–...

Rod Frehlich

1999-11-01T23:59:59.000Z

272

Use of the CSU–CHILL Radar in Radar Meteorology Education at Colorado State University  

Science Conference Proceedings (OSTI)

A recent example illustrating the use of the CSU–CHILL Doppler radar in a graduate-level course in radar meteorology at Colorado State University (CSU) is described. In addition to providing students in the Department of Atmospheric Science with “...

Steven A. Rutledge; Patrick C. Kennedy; David A. Brunkow

1993-01-01T23:59:59.000Z

273

Radial Wind Super-Obs from the WSR-88D Radars in the NCEP Operational Assimilation System  

Science Conference Proceedings (OSTI)

The spatial and temporal densities of Weather Surveillance Radar-1988 Doppler (WSR-88D) raw radar radial wind represent a rich source of high-resolution observations for initializing numerical weather prediction models. A characteristic of these ...

Jordan C. Alpert; V. Krishna Kumar

2007-03-01T23:59:59.000Z

274

The Vertical Profile of Radar Reflectivity of Convective Cells: A Strong Indicator of Storm Intensity and Lightning Probability?  

Science Conference Proceedings (OSTI)

Reflectivity data from Doppler radars are used to construct vertical profiles of radar reflectivity (VPRR) of convective cells in mesoscale convective systems (MCSS) in three different environmental regimes. The National Center for Atmospheric ...

Edward J. Zipser; Kurt R. Lutz

1994-08-01T23:59:59.000Z

275

Radar Observations and Simulation of the Melting Layer of Precipitation  

Science Conference Proceedings (OSTI)

The melting layer in precipitation is physically modeled and compared with high resolution Doppler radar data. The model includes a new formulation of the dielectric properties and can handle all ice particles with densities ranging from pure ...

Wim Klaassen

1988-12-01T23:59:59.000Z

276

Sensitivity Studies of the Models of Radar-Rainfall Uncertainties  

Science Conference Proceedings (OSTI)

It is well acknowledged that there are large uncertainties associated with the operational quantitative precipitation estimates produced by the U.S. national network of the Weather Surveillance Radar-1988 Doppler (WSR-88D). These errors result ...

Gabriele Villarini; Witold F. Krajewski

2010-02-01T23:59:59.000Z

277

Signal Processing System for the CASA Integrated Project I Radars  

Science Conference Proceedings (OSTI)

This paper describes the waveform design space and signal processing system for dual-polarization Doppler weather radar operating at X band. The performance of the waveforms is presented with ground clutter suppression capability and mitigation ...

Nitin Bharadwaj; V. Chandrasekar; Francesc Junyent

2010-09-01T23:59:59.000Z

278

The Assimilation of Radar Data for Weather Prediction  

Science Conference Proceedings (OSTI)

Assimilation of radar data is one of the key scientific challenges for numerical weather prediction of convective systems. Considerable progress has been made in recent years including retrieval of boundary layer winds from single-Doppler ...

Juanzhen Sun; James W. Wilson

2003-08-01T23:59:59.000Z

279

The Spaced Antenna Technique for Radar Wind Profiling  

Science Conference Proceedings (OSTI)

The Doppler method for radar wind profiling of the troposphere and stratosphere has been the standard technique used for operational and most research applications of the instrumentation. An alternative approach for measuring winds, by making use ...

M. F. Larsen; J. Röttger

1989-12-01T23:59:59.000Z

280

Quality Control and Verification of Weather Radar Wind Profiles  

Science Conference Proceedings (OSTI)

Weather radar wind profiles (WRWPs) have been retrieved from Doppler volume scans using different implementations of the velocity–azimuth display (VAD) and volume velocity processing (VVP) methods. An extensive quality control of the radial ...

Iwan Holleman

2005-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Prospects of the WSR-88D Radar for Cloud Studies  

Science Conference Proceedings (OSTI)

Sounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D allow observations of a ...

Valery M. Melnikov; Dusan S. Zrni?; Richard J. Doviak; Phillip B. Chilson; David B. Mechem; Yefim L. Kogan

2011-04-01T23:59:59.000Z

282

A Proposed Technique for Diagnosis by Radar of Hurricane Structure  

Science Conference Proceedings (OSTI)

A Doppler radar technique is proposed for remote estimation of hurricane structure by sampling the kinematic properties of the hurricane wind field in a relatively small circular area outside the radius of maximum winds. This technique uses ...

Ralph J. Donaldson Jr.

1991-12-01T23:59:59.000Z

283

Statistical Quality of Spectral Polarimetric Variables for Weather Radar  

Science Conference Proceedings (OSTI)

Spectral polarimetry for weather radar capitalizes on both Doppler and polarimetric measurements to reveal polarimetric variables as a function of radial velocity through spectral analysis. For example, spectral differential reflectivity at a ...

Tian-You Yu; Xiao Xiao; Yadong Wang

2012-09-01T23:59:59.000Z

284

Radar and Profiler Analysis of Colliding Boundaries: A Case Study  

Science Conference Proceedings (OSTI)

The kinematics of a head-on collision between two gust fronts, followed by a secondary collision between a third gust front and a bore generated by the initial collision, are described using analyses of Weather Surveillance Radar-1988 Doppler (...

Haldun Karan; Kevin Knupp

2009-07-01T23:59:59.000Z

285

Impacts of Polarimetric Radar Observations on Hydrologic Simulation  

Science Conference Proceedings (OSTI)

Rainfall estimated from the polarimetric prototype of the Weather Surveillance Radar-1988 Doppler [WSR-88D (KOUN)] was evaluated using a dense Micronet rain gauge network for nine events on the Ft. Cobb research watershed in Oklahoma. The ...

Jonathan J. Gourley; Scott E. Giangrande; Yang Hong; Zachary L. Flamig; Terry Schuur; Jasper A. Vrugt

2010-06-01T23:59:59.000Z

286

Finescale Radar Observations of Tornado and Mesocyclone Structures  

Science Conference Proceedings (OSTI)

A variety of vortex configurations observed at finescale with Doppler On Wheels (DOW) radars in and near the hook echoes of supercell thunderstorms are described. These include marginal/weak tornadoes, often with no documented condensation funnels,...

Joshua Wurman; Karen Kosiba

2013-10-01T23:59:59.000Z

287

Inversion of Marine Radar Images for Surface Wave Analysis  

Science Conference Proceedings (OSTI)

A method to estimate sea surface elevation maps from marine radar image sequences is presented. This method is the extension of an existing inverse modeling technique to derive wave spectra from marine radar images, which assumes linear wave ...

JoséC. Nieto Borge; Germán RodrÍguez RodrÍguez; Katrin Hessner; Paloma Izquierdo González

2004-08-01T23:59:59.000Z

288

The Measurement of Precipitation with Synthetic Aperture Radar  

Science Conference Proceedings (OSTI)

The radar equation for the measurement of precipitation by SAR is identical to that for a conventional radar. The achievable synthetic beamwidth, ?s, is proportional to ?v/U, the ratio of the spread of the precipitation Doppler spectrum to the ...

David Atlas; Richard K. Moore

1987-09-01T23:59:59.000Z

289

An Analysis of Errors in Drop Size Distribution Retrievals and Rain Bulk Parameters with a UHF Wind Profiling Radar and a Two-Dimensional Video Disdrometer  

Science Conference Proceedings (OSTI)

Vertically pointed wind profiling radars can be used to obtain measurements of the underlying drop size distribution (DSD) for a rain event by means of the Doppler velocity spectrum. Precipitation parameters such as rainfall rate, radar ...

Laura Kanofsky; Phillip Chilson

2008-12-01T23:59:59.000Z

290

Impact of Configurations of Rapid Intermittent Assimilation of WSR-88D Radar Data for the 8 May 2003 Oklahoma City Tornadic Thunderstorm Case  

Science Conference Proceedings (OSTI)

Various configurations of the intermittent data assimilation procedure for Level-II Weather Surveillance Radar-1988 Doppler radar data are examined for the analysis and prediction of a tornadic thunderstorm that occurred on 8 May 2003 near ...

Ming Hu; Ming Xue

2007-02-01T23:59:59.000Z

291

Latent Heating and Cooling Rates in Developing and Nondeveloping Tropical Disturbances during TCS-08: Radar-Equivalent Retrievals from Mesoscale Numerical Models and ELDORA  

Science Conference Proceedings (OSTI)

Latent heating and cooling rates have a critical role in predicting tropical cyclone formation and intensification. In a prior study, Park and Elsberry estimated the latent heating and cooling rates from aircraft Doppler radar [Electra Doppler ...

Myung-Sook Park; Andrew B. Penny; Russell L. Elsberry; Brian J. Billings; James D. Doyle

2013-01-01T23:59:59.000Z

292

Scanning ARM Cloud Radar Handbook  

SciTech Connect

The scanning ARM cloud radar (SACR) is a polarimetric Doppler radar consisting of three different radar designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.

Widener, K; Bharadwaj, N; Johnson, K

2012-06-18T23:59:59.000Z

293

Acoustic Radar Studies of Rain Microphysics  

Science Conference Proceedings (OSTI)

Raindrop size distributions are obtained from the Doppler frequency spectrum of an acoustic radar. Number concentrations of 12 drop diameters with a minimum diameter 0.14 cm are obtained and averaged over 3–15 min at 20-m range gates from 20 to ...

S. G. Bradley

1997-06-01T23:59:59.000Z

294

Wind Synthesis and Quality Control of Multiple-Doppler-Derived Horizontal Wind Fields  

Science Conference Proceedings (OSTI)

Horizontal wind vector fields can be measured in real time by a bistatic Doppler radar network and can be applied directly for hazard warnings and weather surveillance. Most applications, however, especially for meteorological research and ...

Katja Friedrich; Martin Hagen

2004-01-01T23:59:59.000Z

295

Airborne Dual-Doppler Observations of an Intense Frontal System Approaching the Pacific Northwest Coast  

Science Conference Proceedings (OSTI)

Airborne Doppler radar data, collected off the Pacific Northwest coast by a NOAA WP-3D Orion aircraft over an 8-h period on 8 December 1993 during the Coastal Observations and Simulations with Topography experiment, reveal the mesoscale structure ...

Scott A. Braun; Robert A. Houze Jr.; Bradley F. Smull

1997-12-01T23:59:59.000Z

296

An Improved Time Interpolation for Three-Dimensional Doppler Wind Analysis  

Science Conference Proceedings (OSTI)

A temporal interpolation is required for three-dimensional Doppler wind analysis when the precise measurement time is counted for each radar beam position. The time interpolation is traditionally done by a linear scheme either in the measurement ...

Shun Liu; Chongjian Qiu; Qin Xu; Pengfei Zhang

2004-10-01T23:59:59.000Z

297

Doppler flowmeter  

DOE Patents (OSTI)

A Doppler flowmeter impulses an ultrasonic fixed-frequency signal obliquely into a slurry flowing in a pipe and a reflected signal is detected after having been scattered off of the slurry particles, whereby the shift in frequencies between the signals is proportional to the slurry velocity and hence slurry flow rate. This flowmeter filters the Doppler frequency-shift signal, compares the filtered and unfiltered shift signals in a divider to obtain a ratio, and then further compares this ratio against a preset fractional ratio. The flowmeter utilizes a voltage-to-frequency convertor to generate a pulsed signal having a determinable rate of repetition precisely proportional to the divergence of the ratios. The pulsed signal serves as the input control for a frequency-controlled low-pass filter, which provides thereby that the cutoff frequency of the filtered signal is known. The flowmeter provides a feedback control by minimizing the divergence. With the cutoff frequency and preset fractional ratio known, the slurry velocity and hence flow will also be determinable.

Karplus, H.H.B.; Raptis, A.C.

1981-11-13T23:59:59.000Z

298

A Velocity Dealiasing Scheme for Synthetic C-Band Data from China’s New Generation Weather Radar System (CINRAD)  

Science Conference Proceedings (OSTI)

A velocity dealiasing algorithm is developed for C-band (5-cm wavelength) Doppler radars. With the shorter wavelength, C-band radars operating in a single PRF mode have a Nyquist interval about one-half that of S-band radars. As a proxy for C-band ...

Guangxin He; Gang Li; Xiaolei Zou; Peter Sawin Ray

2012-09-01T23:59:59.000Z

299

Measurements and Simulations of Nadir-Viewing Radar Returns from the Melting Layer at X and W Bands  

Science Conference Proceedings (OSTI)

Simulated radar signatures within the melting layer in stratiform rain—namely, the radar bright band—are checked by means of comparisons with simultaneous measurements of the bright band made by the ER-2 Doppler radar (EDOP; X band) and Cloud ...

Liang Liao; Robert Meneghini; Lin Tian; Gerald M. Heymsfield

2009-11-01T23:59:59.000Z

300

Pulse-to-Pulse Coherent Doppler Measurements of Waves and Turbulence  

Science Conference Proceedings (OSTI)

This paper presents laboratory and field testing of a pulse-to-pulse coherent acoustic Doppler profiler for the measurement of turbulence in the ocean. In the laboratory, velocities and wavenumber spectra collected from Doppler and digital ...

Fabrice Veron; W. Kendall Melville

1999-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Estimation and Mapping of Hurricane Turbulent Energy Using Airborne Doppler Measurements  

Science Conference Proceedings (OSTI)

Hurricane turbulent kinetic energy (TKE) was computed using airborne Doppler measurements from the NOAA WP-3D tail radars, and TKE data were retrieved for a variety of storms at different stages of their life cycle. The geometry of the radar ...

Sylvie Lorsolo; Jun A. Zhang; Frank Marks Jr.; John Gamache

2010-09-01T23:59:59.000Z

302

Radar Analysis of a Tropical Convective Boundary Layer with Shallow Cumulus Clouds  

Science Conference Proceedings (OSTI)

A situation of fair weather cloudy convection is examined using a dual Doppler radar, environmental measurements and cloud photogrammetry. The convective layer is characterized by the interaction between the northward monsoon wind at low levels ...

Laurence Eymard

1984-04-01T23:59:59.000Z

303

Use of Real-Time Multisatellite and Radar Data to Support Forest Fire Management  

Science Conference Proceedings (OSTI)

Combined digital data from multiple satellites and Doppler radar can provide fire weather meteorologists and resource managers with accurate information on forest fire location, intensity, growth, smoke plumes, and associated mesoscale weather. ...

Gary L. Hufford; H. Lee Kelley; William Sparkman; Raymond K. Moore

1998-09-01T23:59:59.000Z

304

The BMRC/NCAR C-Band Polarimetric (C-POL) Radar System  

Science Conference Proceedings (OSTI)

The development of the first Australian C-band polarimetric/Doppler meteorological radar system (C-POL) is described. Motivated by the need to obtain improved rainfall estimation and the vertical profile of hydrometeors, C-POL was developed ...

T. Keenan; K. Glasson; F. Cummings; T. S. Bird; J. Keeler; J. Lutz

1998-08-01T23:59:59.000Z

305

Wideband Reception and Processing for Dual-Polarization Radars with Dual Transmitters  

Science Conference Proceedings (OSTI)

Oversampling pulsed Doppler radar returns at a rate larger than the pulse bandwidth, whitening the range samples, and subsequent averaging has been pursued as a potential way to decrease the measured standard deviation of signal parameter ...

Sutanay Choudhury; V. Chandrasekar

2007-01-01T23:59:59.000Z

306

Radar Observations and Numerical Modeling of a Precipitating Line during MAP IOP 5  

Science Conference Proceedings (OSTI)

During the special observing period of the Mesoscale Alpine Programme, a narrow north–south-oriented frontal precipitation band was observed by two airborne and one operational Doppler radar on 4 October 1999, over the Friuli target area in ...

Stéphanie Pradier; Michel Chong; Frank Roux

2002-11-01T23:59:59.000Z

307

The Shared Mobile Atmospheric Research and Teaching Radar: A Collaboration to Enhance Research and Teaching  

Science Conference Proceedings (OSTI)

A group of scientists from three universities across two different states and from one federal research laboratory joined together to build and deploy two mobile C-band Doppler weather radars to enhance research and promote meteorological ...

Michael I. Biggerstaff; Louis J. Wicker; Jerry Guynes; Conrad Ziegler; Jerry M. Straka; Erik N. Rasmussen; Arthur Doggett IV; Larry D. Carey; John L. Schroeder; Chris Weiss

2005-09-01T23:59:59.000Z

308

The 10-cm-Wavelength Polarimetric Weather Radar at NOAA's National Severe Storms Laboratory  

Science Conference Proceedings (OSTI)

The NSSL Doppler radar has been upgraded to include polarimetric measurements and remote operations. We discuss details of thew upgrades and specifics concerning real-time computations of polarimetric variables. Tests and calibrations have proven ...

A. Zahrai; D. S. Zrni?

1993-10-01T23:59:59.000Z

309

Identification of the Melting Layer through Dual-Polarization Radar Measurements at Vertical Incidence  

Science Conference Proceedings (OSTI)

Features of the melting layer of precipitation such as height and thickness are important in many meteorological applications. Doppler radar observations with a vertically pointing antenna have often been used in order to derive these features ...

Luca Baldini; Eugenio Gorgucci

2006-06-01T23:59:59.000Z

310

Centrifuging of Hydrometeors and Debris in Tornadoes: Radar-Reflectivity Patterns and Wind-Measurement Errors  

Science Conference Proceedings (OSTI)

High-resolution Doppler radar observations of tornadoes reveal a distinctive tornado-scale signature with the following properties: a reflectivity minimum aloft inside the tornado core (described previously as an “eye”), a high-reflectivity tube ...

David C. Dowell; Curtis R. Alexander; Joshua M. Wurman; Louis J. Wicker

2005-06-01T23:59:59.000Z

311

Radar Observations of the Diurnally Forced Offshore Convective Lines along the Southeastern Coast of Taiwan  

Science Conference Proceedings (OSTI)

This study documents offshore convective lines along the southeastern coast of Taiwan, a frequent but poorly understood mesoscale phenomenon that influences coastal weather during the Taiwan mei-yu season. Doppler radar and surface observations ...

Cheng-Ku Yu; Ben Jong-Dao Jou

2005-06-01T23:59:59.000Z

312

Measurement of Clear-Air Gradients and Turbulence Properties with Radar Wind Profilers  

Science Conference Proceedings (OSTI)

An experiment comparing balloon and profiler observations was carried out to evaluate the capability of Doppler radar wind profilers to remotely measure useful meteorological quantities other than wind. The site chosen was in Southern California ...

E. E. Gossard; D. E. Wolfe; K. P. Moran; R. A. Paulus; K. D. Anderson; L. T. Rogers

1998-04-01T23:59:59.000Z

313

Evaluation of the Simultaneous Multiple Pulse Repetition Frequency Algorithm for Weather Radar  

Science Conference Proceedings (OSTI)

Performance of the simultaneous multiple pulse repetition frequency algorithm (SMPRF) for recovery of mean power and mean Doppler velocity is investigated using simulated weather radar data. Operation and functionality of the algorithm is ...

Evan Ruzanski; John C. Hubbert; V. Chandrasekar

2008-07-01T23:59:59.000Z

314

An Examination of Radar and Rain Gauge–Derived Mean Areal Precipitation over Georgia Watersheds  

Science Conference Proceedings (OSTI)

Compared to conventional rain gauge networks, the Weather Surveillance Radar-1988 Doppler provides precipitation estimates at enhanced spatial and temporal resolution that River Forecast Centers can use to improve streamflow forecasts. This study ...

Keith M. Stellman; Henry E. Fuelberg; Reggina Garza; Mary Mullusky

2001-02-01T23:59:59.000Z

315

An Evaluation of the Accuracy of Some Radar Wind Profiling Techniques  

Science Conference Proceedings (OSTI)

Advances in clear air Doppler radar measurement have made practical the monitoring of radial velocities in the troposphere and lower stratosphere and even the vector wind, under some assumptions. Because the objective of wind profiling is to ...

Albert J. Koscielny; Richard J. Doviak; Dusan S. Zrnic

1984-12-01T23:59:59.000Z

316

Finescale Radar Observations of the Dimmitt, Texas (2 June 1995), Tornado  

Science Conference Proceedings (OSTI)

The mature and dissipating stages of a strong tornado were observed from close range by the prototype Doppler On Wheels mobile radar. Volumetric observations repeated eight times over an 840-s period with resolution volumes at the center of the ...

Joshua Wurman; Swarndeep Gill

2000-07-01T23:59:59.000Z

317

Single- and Dual-Doppler Analysis of a Tornadic Vortex and Surrounding Storm-Scale Flow in the Crowell, Texas, Supercell of 30 April 2000  

Science Conference Proceedings (OSTI)

Fine-resolution single- and dual-Doppler data were collected in the tornadic region of a supercell storm intercepted by two Doppler-on-Wheels radars on 30 April 2000 near Crowell, Texas. Eleven dual-Doppler analyses characterize the 2D and 3D ...

James Marquis; Yvette Richardson; Joshua Wurman; Paul Markowski

2008-12-01T23:59:59.000Z

318

A Real-Time Four-Dimensional Doppler Dealiasing Scheme  

Science Conference Proceedings (OSTI)

A new dealiasing scheme uses the full four-dimensionality available in an operational Doppler radar data stream. It examines one tilt angle at a time, beginning at the highest elevation where clutter is minimal and gate-to-gate shear is typically ...

Curtis N. James; Robert A. Houze Jr.

2001-10-01T23:59:59.000Z

319

The Case of Sharp Velocity Transitions in High Vertical Wind Shear When Measuring Doppler Velocities with Narrow Nyquist Intervals  

Science Conference Proceedings (OSTI)

An investigation was launched following unexpected observations of step-function transitions in Doppler velocities from scanning radars in regions of high vertical wind shear. It revealed that, if wind velocity transitions are sufficiently sharp ...

Frédéric Fabry; Clotilde Augros; Aldo Bellon

2013-03-01T23:59:59.000Z

320

Statistical Errors in Variational Data Assimilation–A Theoretical One-Dimensional Analysis Applied to Doppler Wind Retrieval  

Science Conference Proceedings (OSTI)

When the velocity field is retrieved by a variational data assimilation method from the tracer (reflectivity) pattern movement observed by a Doppler radar, the accuracy of the retrieved velocity is affected by the observational error and data ...

Shuowen Yang; Qin Xu

1996-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

A High Resolution Spatial and Temporal Multiple Doppler Analysis of a Microburst and Its Application to Aircraft Flight Simulation  

Science Conference Proceedings (OSTI)

Multiple Doppler radar data collected during the Joint Airport Weather Studies (JAWS) Project is used to synthesize the three-dimensional wind in the region of a microburst. The particular microburst used in this study is the strongest one to ...

K. L. Elmore; J. McCarthy; W. Frost; H. P. Chang

1986-10-01T23:59:59.000Z

322

Directional Surface Wave Estimates from Doppler Sonar Data  

Science Conference Proceedings (OSTI)

A quick analysis for deriving directional-frequency spectra from surface grazing Doppler sonar data is presented. Here, “quick” refers to both the short time span of data required and computational ease. The technique employs time and space ...

Jerome A. Smith; Gregory T. Bullard

1995-06-01T23:59:59.000Z

323

Doppler Sonar and Surface Waves: Range and Resolution  

Science Conference Proceedings (OSTI)

The performance limitations of an acoustic Doppler sonar system are explored and compared with anticipated requirements for the measurement of surface wave directional/frequency spectra. To obtain measurements to a range D requires a delay ?t ...

Jerome A. Smith

1989-08-01T23:59:59.000Z

324

A 94-GHz Cloud Radar System on a NASA High-Altitude ER-2 Aircraft  

Science Conference Proceedings (OSTI)

The 94-GHz (W band) Cloud Radar System (CRS) has been developed and flown on a NASA ER-2 high-altitude (20 km) aircraft. The CRS is a fully coherent, polarimetric Doppler radar that is capable of detecting clouds and precipitation from the ...

Lihua Li; Gerald M. Heymsfield; Paul E. Racette; Lin Tian; Ed Zenker

2004-09-01T23:59:59.000Z

325

The DeTect Inc. RAPTOR VAD-BL Radar Wind Profiler  

Science Conference Proceedings (OSTI)

The DeTect Inc. RAPTOR VAD-BL (Velocity-Azimuth Display Boundary Layer) radar wind profiler is a pulsed Doppler radar used to make automatic unattended measurements of wind profiles in the lower atmosphere. All data products are produced on site, ...

Elías Lau; Scott McLaughlin; Frank Pratte; Bob Weber; David Merritt; Maikel Wise; Gary Zimmerman; Matthew James; Megan Sloan

326

The DeTect Inc. RAPTOR VAD-BL Radar Wind Profiler  

Science Conference Proceedings (OSTI)

The DeTect Inc. RAPTOR velocity–azimuth display boundary layer (VAD-BL) radar wind profiler is a pulsed Doppler radar used to make automatic unattended measurements of wind profiles in the lower atmosphere. All data products are produced on site, ...

Elías Lau; Scott McLaughlin; Frank Pratte; Bob Weber; David Merritt; Maikel Wise; Gary Zimmerman; Matthew James; Megan Sloan

2013-09-01T23:59:59.000Z

327

Radar Nowcasting of Cloud-to-Ground Lightning over Houston, Texas  

Science Conference Proceedings (OSTI)

Ten years (1997–2006) of summer (June–August) daytime (1400–0000 UTC) Weather Surveillance Radar-1988 Doppler data for Houston, Texas, were examined to determine the best radar-derived predictors of the first cloud-to-ground lightning flash from a ...

Richard M. Mosier; Courtney Schumacher; Richard E. Orville; Lawrence D. Carey

2011-04-01T23:59:59.000Z

328

Virtual Doppler Lidar Instrument  

Science Conference Proceedings (OSTI)

Doppler lidars measure the range-resolved line-of-sight wind component by extracting the Doppler shift of radiation backscattered from atmospheric aerosols and molecules. A virtual instrument was developed to simulate wind measurements by flying ...

Ines Leike; Jürgen Streicher; Christian Werner; Viktor Banakh; Igor Smalikho; Werner Wergen; Alexander Cress

2001-09-01T23:59:59.000Z

329

Title: Radar-observed convective characteristics during TWP-ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

330

The Analysis and Prediction of Microphysical States and Polarimetric Radar Variables in a Mesoscale Convective System Using Double-Moment Microphysics, Multi-Network Radar Data, and the Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

Doppler radar data are assimilated with an ensemble Kalman Filter (EnKF) in combination with a double-moment (DM) microphysics scheme in order to improve the analysis and forecast of microphysical states and precipitation structures within a ...

Bryan J. Putnam; Ming Xue; Youngsun Jung; Nathan Snook; Guifu Zhang

331

Multiple-Radar Data Assimilation and Short-Range Quantitative Precipitation Forecasting of a Squall Line Observed during IHOP_2002  

Science Conference Proceedings (OSTI)

The impact of multiple–Doppler radar data assimilation on quantitative precipitation forecasting (QPF) is examined in this study. The newly developed Weather Research and Forecasting (WRF) model Advanced Research WRF (ARW) and its three-...

Qingnong Xiao; Juanzhen Sun

2007-10-01T23:59:59.000Z

332

Alternating Dual-Pulse, Dual-Frequency Techniques for Range and Velocity Ambiguity Mitigation on Weather Radars  

Science Conference Proceedings (OSTI)

This paper introduces a family of alternating dual-pulse, dual-frequency (ADPDF) techniques. These are based on frequency diversity and are proposed as a means to mitigate range and velocity ambiguities on Doppler weather radars. ADPDF techniques ...

Sebastián Torres; Richard Passarelli Jr.; Alan Siggia; Pentti Karhunen

2010-09-01T23:59:59.000Z

333

An Airborne Profiling Radar Study of the Impact of Glaciogenic Cloud Seeding on Snowfall from Winter Orographic Clouds  

Science Conference Proceedings (OSTI)

Data from an airborne vertically pointing millimeter-wave Doppler radar are used to study the cloud microphysical effect of glaciogenic seeding of cold-season orographic clouds. Fixed flight tracks were flown downstream of ground-based silver ...

Bart Geerts; Qun Miao; Yang Yang; Roy Rasmussen; Daniel Breed

2010-10-01T23:59:59.000Z

334

The Advantages of a Mixed-Band Radar Network for Severe Weather Operations: A Case Study of 13 May 2009  

Science Conference Proceedings (OSTI)

Adding a mix of X- or C-band radars to the current Weather Surveillance Radar-1988 Doppler (WSR-88D) network could address several limitations of the network, including improvements to spatial gaps in low-level coverage and temporal sampling of ...

Vivek N. Mahale; Jerald A. Brotzge; Howard B. Bluestein

335

Observations of Quasi-Symmetric Echo Patterns in Clear Air with the CSU–CHILL Polarimetric Radar  

Science Conference Proceedings (OSTI)

On a few occasions during the summer and fall of 2002, and again in the fall of 2003, the Colorado State University (CSU)–University of Chicago–Illinois State Water Survey (CHILL) S-band polarimetric Doppler radar observed dumbbell-shaped radar ...

Timothy J. Lang; Steven A. Rutledge; Jeffrey L. Stith

2004-08-01T23:59:59.000Z

336

HF Radar Performance in a Low-Energy Environment: CODAR SeaSonde Experience on the West Florida Shelf  

Science Conference Proceedings (OSTI)

Three long-range (5 MHz) Coastal Ocean Dynamics Application Radar (CODAR) SeaSonde HF radars overlooking an array of as many as eight moored acoustic Doppler current profilers (ADCPs) have operated on the West Florida Shelf since September 2003 ...

Yonggang Liu; Robert H. Weisberg; Clifford R. Merz; Sage Lichtenwalner; Gary J. Kirkpatrick

2010-10-01T23:59:59.000Z

337

Radar-cross-section reduction of wind turbines. part 1.  

SciTech Connect

In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techniques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

Brock, Billy C.; Loui, Hung; McDonald, Jacob J.; Paquette, Joshua A.; Calkins, David A.; Miller, William K.; Allen, Steven E.; Clem, Paul Gilbert; Patitz, Ward E.

2012-03-05T23:59:59.000Z

338

A Frequent-Updating Analysis System Based on Radar, Surface, and Mesoscale Model Data for the Beijing 2008 Forecast Demonstration Project  

Science Conference Proceedings (OSTI)

The Variational Doppler Radar Analysis System (VDRAS) was implemented in Beijing, China, and contributed to the Beijing 2008 Forecast Demonstration Project (B08FDP) in support of the Beijing Summer Olympics. VDRAS is a four-dimensional ...

Juanzhen Sun; Mingxuan Chen; Yingchun Wang

2010-12-01T23:59:59.000Z

339

Application of a Bayesian Wind Profile Retrieval Technique to Radar Data Collected in the Alpine Southern Upslope Region and Comparison with Upstream Wind Profiler Measurements  

Science Conference Proceedings (OSTI)

In this paper, a new operational technique to retrieve the horizontal wind profile from Doppler radar measurements is used to carry out a statistical comparison of upslope and upstream wind profiles in the southern flank of the European Alps. The ...

P. Tabary; M. Petitdidier

2002-06-01T23:59:59.000Z

340

Statistical Location and Timing of the Convective Lines off the Mountainous Coast of Southeastern Taiwan from Long-Term Radar Observations  

Science Conference Proceedings (OSTI)

In this study, observations from the C-band Doppler radar on Green Island, which is located off the southeastern coast of Taiwan, during 1998–2004 were analyzed to investigate the statistical characteristics of the convective lines occurring off ...

Cheng-Ku Yu; Che-Yu Lin

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

The Accuracy of Vertical Air Velocities from Doppler Radar Data  

Science Conference Proceedings (OSTI)

Eight methods of calculating vertical air velocity in a column are compared. Each method requires some or all of the following data: horizontal divergence, vertical precipitation velocity, hydrometeor terminal fall speed, and vertical air ...

Thomas Matejka; Diana L. Bartels

1998-01-01T23:59:59.000Z

342

Doppler Radar Analysis of a Snake River Plain Convergence Event  

Science Conference Proceedings (OSTI)

A convergence zone periodically forms in the Snake River plain (SRP) of eastern Idaho as a result of terrain-induced boundary layer flow under synoptic northwesterly flow at low and midlevels. Complex terrain in central and eastern Idaho is ...

Thomas A. Andretta; Dean S. Hazen

1998-06-01T23:59:59.000Z

343

Wavelet Applications for Mesocyclone Identification in Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Severe weather often emanates from thunderstorms that have persistent, well organized, rotating updrafts. These rotating updrafts, which are generally referred to as mesocyclones, appear as couplets of incoming and outgoing radial velocities to a ...

Paul R. Desrochers; Samuel Y. K. Yee

1999-07-01T23:59:59.000Z

344

Influence of Wave Propagation on the Doppler Spreading of Atmospheric Gravity Waves  

Science Conference Proceedings (OSTI)

The “Doppler spread” theory of atmospheric gravity waves has developed rapidly in recent years, from an initial theory of wave spectra into a general parameterization of gravity wave effects for use in global models of the middle atmosphere. Yet ...

Stephen D. Eckermann

1997-11-01T23:59:59.000Z

345

A Correction Method for Turbulence Measurements with a 3D Acoustic Doppler Velocity Profiler  

Science Conference Proceedings (OSTI)

A method is proposed to reduce the noise contribution to mean turbulence parameters obtained by 3D acoustic Doppler velocity profiler measurements. It is based on a noise spectrum reconstruction from cross-spectra evaluations of two independent ...

D. Hurther; U. Lemmin

2001-03-01T23:59:59.000Z

346

Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Radar Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Active Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: Detect fault and ground movement Hydrological: Can give indications about subsurface geothermal fluid flow Thermal: Dictionary.png Radar: Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. Other definitions:Wikipedia Reegle Introduction RAdio Detection And Ranging (RADAR) is used in a wide variety of applications. In remote sensing applications, the source of the radio waves

347

Science Goals for the ARM Recovery Act Radars  

SciTech Connect

Science Goals for the ARM Recovery Act Radars. In October 2008, an ARM workshop brought together approximately 30 climate research scientists to discuss the Atmospheric Radiation Measurement (ARM) Climate Research Facility's role in solving outstanding climate science issues. Through this discussion it was noted that one of ARM's primary contributions is to provide detailed information about cloud profiles and their impact on radiative fluxes. This work supports cloud parameterization development and improved understanding of cloud processes necessary for that development. A critical part of this work is measuring microphysical properties (cloud ice and liquid water content, cloud particle sizes, shapes, and distribution). ARM measurements and research have long included an emphasis on obtaining the best possible microphysical parameters with the available instrumentation. At the time of the workshop, this research was reaching the point where additional reduction in uncertainties in these critical parameters required new instrumentation for applications such as specifying radiative heating profiles, measuring vertical velocities, and studying the convective triggering and evolution of three-dimensional (3D) cloud fields. ARM was already operating a subset of the necessary instrumentation to make some progress on these problems; each of the ARM sites included (and still includes) a cloud radar (operating at 35 or 94 GHz), a cloud lidar, and balloon-borne temperature and humidity sensors. However, these measurements were inadequate for determining detailed microphysical properties in most cases. Additional instrumentation needed to improve retrievals of microphysical processes includes radars at two additional frequencies for a total of three at a single site (35 GHz, 94 GHz, and a precipitation radar) and a Doppler lidar. Evolving to a multi-frequency scanning radar is a medium-term goal to bridge our understanding of two-dimensional (2D) retrievals to the 3D cloud field. These additional microphysical measurements would allow detailed cloud properties to be derived even in the presence of light precipitation. It is important to couple these detailed measurements of cloud microphysics to vertical motion on the cloud scale to couple microphysics with meteorological processes. Vertically pointing Doppler radars provide the vertical motion of cloud particles but, to separate particle motion from air motion, a wind profiler is required. The American Recovery and Reinvestment Act provided the means to address these needs and implement a multi-frequency suite of radars, including scanning radars, at each of the ARM sites. In addition, Doppler lidars have been deployed at several sites. With these new measurement capabilities, ARM has the measurement capabilities to tackle the problems of improving microphysical profile descriptions and evaluating the relationship between our current narrow-field-of view, zenith perspective on clouds to a description of the full 3D cloud field and its temporal evolution.

JH Mather

2012-05-29T23:59:59.000Z

348

Wideband Waveform Design principles for Solid-state Weather Radars  

Science Conference Proceedings (OSTI)

The use of solid-state transmitter is becoming a key part of the strategy to realize a network of low cost electronically steered radars. However, solid-state transmitters have low peak powers and this necessitates the use of pulse compression waveforms. In this paper a frequency diversity wideband waveforms design is proposed to mitigate low sensitivity of solid-state transmitters. In addition, the waveforms mitigate the range eclipsing problem associated with long pulse compression. An analysis of the performance of pulse compression using mismatched compression filters designed to minimize side lobe levels is presented. The impact of range side lobe level on the retrieval of Doppler moments are presented. Realistic simulations are performed based on CSU-CHILL radar data and Center for Collaborative Adaptive Sensing of the Atmosphere (CASA) Integrated Project I (IP1) radar data.

Bharadwaj, Nitin; Chandrasekar, V.

2012-01-01T23:59:59.000Z

349

An investigation of the Goshen County, Wyoming, tornadic supercell of 5 June 2009 using EnKF assimilation of mobile mesonet and radar observations collected during VORTEX2. Part I: Experiment design and verification of the EnKF analyses  

Science Conference Proceedings (OSTI)

High-resolution Doppler radar velocities and in situ surface observations collected in a tornadic supercell on 5 June 2009 during the second Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX2) are assimilated into a simulated ...

James Marquis; Yvette Richardson; Paul Markowski; David Dowell; Joshua Wurman; Karen Kosiba; Paul Robinson; Glen Romine

350

The EDOP Radar System on the High-Altitude NASA ER-2 Aircraft  

Science Conference Proceedings (OSTI)

The NASA ER-2 high-altitude (20 km) aircraft that emulates a satellite view of precipitation systems carries a variety of passive and active (lidar) remote sensing instruments. A new Doppler weather radar system at X band (9.6 GHz) called the ER-...

Gerald M. Heymsfield; Steven W. Bidwell; I. Jeff Caylor; Syed Ameen; Shaun Nicholson; Wayne Boncyk; Lee Miller; Doug Vandemark; Paul E. Racette; Louis R. Dod

1996-08-01T23:59:59.000Z

351

A Study on Optimum Tilt Angle for Wind Estimation Using Indian MST Radar  

Science Conference Proceedings (OSTI)

The effect of tilt angle on horizontal wind estimation is studied using Indian mesosphere–stratosphere–troposphere (MST) radar located at Gadanki (13.45°N, 79.18°E). It operates in Doppler beam swinging (DBS) mode with a beamwidth of 3°. ...

V. K. Anandan; I. Srinivasa Rao; P. Narasimha Reddy

2008-09-01T23:59:59.000Z

352

Comparison of Lake-Effect Snow Precipitation Rates Determined from Radar and Aircraft Measurements  

Science Conference Proceedings (OSTI)

Snow-particle size-mass relations derived from radar reflectivity and particle-size spectra obtained from Particle Measuring Systems (PMS) probes in nonconvective clouds predict greater masses for large particles than are indicated by most direct ...

R. R. Braham Jr.; D. A. R. Kristovich; M. J. Dungey

1992-03-01T23:59:59.000Z

353

Retrieval of Raindrop Size Distribution from Simulated Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

Observations of raindrop size distributions (DSDs) have validated the use of three-parameter distribution functions in representing the observed spectra. However, dual-frequency radar measurements are limited to retrieving two independent ...

S. Joseph Munchak; Ali Tokay

2008-01-01T23:59:59.000Z

354

Synthetic Aperture Radar -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Contacts Synthetic Aperture Radar Sandia synthetic aperture radar image of Washington, DC Sandia synthetic aperture radar image of Washington, DC Sandia synthetic...

355

Synthetic Aperture Radar Interferometry  

E-Print Network (OSTI)

Synthetic aperture radar interferometry is an imaging technique for measuring the topography of a surface, its changes over time, and other changes in the detailed characteristics of the surface. By exploiting the phase of the coherent radar signal, interferometry has transformed radar remote sensing from a largely interpretive science to a quantitative tool, with applications in cartography, geodesy, land cover characterization, and natural hazards. This paper reviews the techniques of interferometry, systems and limitations, and applications in a rapidly growing area of science and engineering.

Paul A. Rosen; Scott Hensley; Ian R. Joughin; Fuk K. Li; Søren N. Madsen; Senior Member; Ernesto Rodríguez; Richard M. Goldstein

2000-01-01T23:59:59.000Z

356

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole. 7 figs.

Chang, Hsi-Tien

1987-09-28T23:59:59.000Z

357

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.

Chang, Hsi-Tien (Albuquerque, NM)

1989-01-01T23:59:59.000Z

358

Radar remote sensing of the lower atmosphere  

E-Print Network (OSTI)

on the observed radar clutter power. Marine ducts and theiron observed radar clutter power. Marine ducts and their

Karimian, Ali

2012-01-01T23:59:59.000Z

359

A Physically Based Radar Simulator  

Science Conference Proceedings (OSTI)

There is a growing use of multiparameter radars for observation of the atmosphere and, in particular, for remote sensing of rain. Radar systems have the undeniable advantage of being able to monitor very large areas with a single installation in ...

Carlo Capsoni; Michele D’Amico

1998-04-01T23:59:59.000Z

360

Vertical Motions in the Upper Middle Atmosphere from the Saskatoon (52°N, 107°W) M.F. Radar  

Science Conference Proceedings (OSTI)

The Saskatoon M.F. radar (52°N, 107°W) was operated in a Doppler mode to measure the vertical motions in the middle atmosphere (60–110 km). The 5-min and 1-h mean velocities were accumulated for a full calendar year.

C. E. Meek; A. H. Manson

1989-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Mapping of Near-Surface Winds in Hurricane Rita Using Finescale Radar, Anemometer, and Land-Use Data  

Science Conference Proceedings (OSTI)

Data collected from a Doppler on Wheels (DOW) mobile radar deployed in Port Arthur, Texas, near the point of landfall of Hurricane Rita (2005) and from two Florida Coastal Monitoring Program 10-m weather stations (FCMP-WSs) are used to ...

Karen Kosiba; Joshua Wurman; Forrest J. Masters; Paul Robinson

2013-12-01T23:59:59.000Z

362

Snow studies, Part III-B: Ensemble retrieval of snow microphysics from dual wavelength vertically pointing radars  

Science Conference Proceedings (OSTI)

Based on the theory developed in Part III-A, this paper introduces a new method to retrieve snow microphysics from ground-based collocated X- and W-band vertically pointing Doppler radars. To take into account the variety of microphysical ...

Wanda Szyrmer; Isztar Zawadzki

363

ARM - Measurement - Radar polarization  

NLE Websites -- All DOE Office Websites (Extended Search)

polarization polarization ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Radar polarization The temporal and geometric behavior of the electric field vector of an electromagnetic wave transmitted or received by a radar system, e.g. elliptical polarization, differential reflectivity, phase shift, co-polar correlation coefficient, linear depolarization ratio. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CSAPR : C-Band ARM Precipitation Radar

364

X-band Scanning ARM Precipitation Radar (X-SAPR) Instrument Handbook  

SciTech Connect

The X-band scanning ARM cloud radar (X-SAPR) is a full-hemispherical scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 200 kW magnetron transmitter, this puts 100 kW of transmitted power for each polarization. The receiver for the X-SAPR is a Vaisala Sigmet RVP-900 operating in a coherent-on-receive mode. Three X-SAPRs are deployed around the Southern Great Plains (SGP) Central Facility in a triangular array. A fourth X-SAPR is deployed near Barrow, Alaska on top of the Barrow Arctic Research Center.

Widener, K; Bharadwaj, N

2012-10-29T23:59:59.000Z

365

Definition: Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search Dictionary.png Radar Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. View on Wikipedia Wikipedia Definition Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter. Radar was secretly developed by several nations before and

366

A Comparison of Radar Reflectivity Estimates of Rainfall from Collocated Radars  

Science Conference Proceedings (OSTI)

Radar reflectivity–based rainfall estimates from collocated radars are examined. The usual large storm-to-storm variations in radar bias and high correlation between radar estimates and rain gauge observations are found. For three storms in ...

Edward A. Brandes; J. Vivekanandan; James W. Wilson

1999-09-01T23:59:59.000Z

367

Reflectivity, Rain Rate, and Kinetic Energy Flux Relationships Based on Raindrop Spectra  

Science Conference Proceedings (OSTI)

The relationships between radar reflectivity factor Z, rainfall rate R, and rainfall kinetic energy flux E were analyzed based on a multiyear raindrop spectra dataset recorded by a Joss–Waldvogel disdrometer in the Goodwin Creek research ...

Matthias Steiner; James A. Smith

2000-11-01T23:59:59.000Z

368

The Evolution of Hurricane Danny (1997) at Landfall: Doppler-Observed Eyewall Replacement, Vortex Contraction/Intensification, and Low-Level Wind Maxima  

Science Conference Proceedings (OSTI)

Danny made landfall as a minimal hurricane on the Alabama coast on 19 July 1997 after drifting over Mobile Bay for over 10 h. Danny’s unusually close proximity to the Doppler radar (WSR-88D) in Mobile provided an unprecedented view of the storm’s ...

Keith G. Blackwell

2000-12-01T23:59:59.000Z

369

Validation of NCAR 10.6-?m CO2 Doppler Lidar Radial Velocity Measurements and Comparison with a 915-MHz Profiler  

Science Conference Proceedings (OSTI)

The capability of the NCAR 10.6-?m-wavelength CO2 Doppler lidar to measure radial air motion is validated by examining hard-target test data, comparing measurements with those from a two-axis propeller anemometer and a 915-MHz profiling radar, ...

Shane D. Mayor; Donald H. Lenschow; Ronald L. Schwiesow; Jakob Mann; Charles L. Frush; Melinda K. Simon

1997-10-01T23:59:59.000Z

370

The Operational Weather Radar Network in Europe  

Science Conference Proceedings (OSTI)

The operational weather radar network in Europe covers more than 30 countries and contains more than 200 weather radars. The radar network is heterogeneous in hardware, signal processing, transmit/receive frequency, and scanning strategy, thus making it ...

Asko Huuskonen; Elena Saltikoff; Iwan Holleman

371

How Radar Works | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for How Radar Works Citation Institute For Geophysics. How Radar Works...

372

The Synthetic Dual-Doppler Analysis Technique  

Science Conference Proceedings (OSTI)

Synthetic dual-Doppler (SDD) is a single-Doppler analysis technique that combines measurements from two different times, provided the viewing angle changes significantly. In this study, the viability of the SDD technique is investigated through ...

Brian A. Klimowski; John D. Marwitz

1992-12-01T23:59:59.000Z

373

The quiet Sun average Doppler shift of coronal lines up to 2 MK  

E-Print Network (OSTI)

The average Doppler shift shown by spectral lines formed from the chromosphere to the corona reveals important information on the mass and energy balance of the solar atmosphere, providing an important observational constraint to any models of the solar corona. Previous spectroscopic observations of vacuum ultra-violet (VUV) lines have revealed a persistent average wavelength shift of lines formed at temperatures up to 1 MK. At higher temperatures, the behaviour is still essentially unknown. Here we analyse combined SUMER/SoHO and EIS/Hinode observations of the quiet Sun around disk centre to determine, for the first time, the average Doppler shift of several spectral lines formed between 1 and 2 MK, where the largest part of the quiet coronal emission is formed. The measurements are based on a novel technique applied to EIS spectra to measure the difference in Doppler shift between lines formed at different temperatures. Simultaneous wavelength-calibrated SUMER spectra allow establishing the absolute value a...

Dadashi, Neda; Solanki, Sami K

2011-01-01T23:59:59.000Z

374

Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas  

E-Print Network (OSTI)

Ten years (1997 - 2006) of summer (June, July, August) daytime (14 - 00 Z) Weather Surveillance Radar - 1988 Doppler data for Houston, TX were examined to determine the best radar-derived lightning forecasting predictors. Convective cells were tracked using a modified version of the Storm Cell Identification and Tracking (SCIT) algorithm and then correlated to cloud-to-ground lightning data from the National Lightning Detection Network (NLDN). Combinations of three radar reflectivity values (30, 35, and 40 dBZ) at four isothermal levels (-10, -15, -20, and updraft -10 degrees C) and a new radar-derived product, vertically integrated ice (VII), were used to optimize a radar-based lightning forecast algorithm. Forecasts were also delineated by range and the number of times a cell was identified and tracked by the modified SCIT algorithm. This study objectively analyzed 65,399 unique cells, and 1,028,510 to find the best lightning forecast criteria. Results show that using 30 dBZ at the -20 degrees C isotherm on cells within 75 km of the radar that have been tracked for at least 2 consecutive scan produces the best forecasts with a critical success index (CSI) of 0.71. The best VII predictor was 0.734 kg m-2 on cells within 75 km of the radar that have been tracked for at least 2 consecutive scans producing a CSI of 0.68. Results of this study further suggest that combining the radar reflectivity and VII methods can result in a more accurate lightning forecast than either method alone.

Mosier, Richard Matthew

2009-12-01T23:59:59.000Z

375

A Marine Radar Wind Sensor  

Science Conference Proceedings (OSTI)

A new method for retrieving the wind vector from radar-image sequences is presented. This method, called WiRAR, uses a marine X-band radar to analyze the backscatter of the ocean surface in space and time with respect to surface winds. Wind ...

Heiko Dankert; Jochen Horstmann

2007-09-01T23:59:59.000Z

376

Ultrasonic radar and its applications  

Science Conference Proceedings (OSTI)

A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); ... Keywords: PIC, radar, rangefinder, surveying, target, ultrasonic, weapon

Mansoor-Ul-Hassan Siddique

2009-08-01T23:59:59.000Z

377

Value of a Dual-Polarized Gap-Filling Radar in Support of Southern California Post-Fire Debris-Flow Warnings  

Science Conference Proceedings (OSTI)

A portable truck-mounted C-band Doppler weather radar was deployed to observe rainfall over the Station Fire burn area near Los Angeles, California, during the winter of 2009/10 to assist with debris-flow warning decisions. The deployments were a ...

David P. Jorgensen; Maiana N. Hanshaw; Kevin M. Schmidt; Jayme L. Laber; Dennis M. Staley; Jason W. Kean; Pedro J. Restrepo

2011-12-01T23:59:59.000Z

378

Range dependent errors in the convective and stratiform partitioning of a radar precipitation estimation algorithm  

E-Print Network (OSTI)

The Tropical Rainfall Measuring Mission (TRMM), designed to assist climate and atmospheric circulation modeling efforts by providing accurate information on tropical precipitation and latent-heat release, will require ground based validation of satellite derived rainfall totals and type classification. A key element in ground validation is the precipitation classification method authored by Steiner and Houze. The method partitions precipitation by type using a radar reflectivity threshold technique. Steiner and Houze report a lack of any significant range dependency, despite the normal problems associated with beam spreading and increasing altitude with range. This study will examine the Steiner and Houze classification method to quantify the effect of range dependent problems in discerning precipitation type. Radar data for this study were collected on January 10 and 18, 1993 during the Tropical Ocean Global Atmosphere (TOGA) Coupled Ocean-Atmosphere Response Experiment (COARE), by the National Oceanic and Atmospheric Administration (NOAA) N42RF WP-3D Orion aircraft's tail Doppler radar as well as the Massachusetts Institute of Technology's (MIT) Doppler radar deployed on board the United States research vessel Vickers. The data were chosen so the PW-3D tail radar data set maintained low ranges to precipitation of interest while the MIT radar data set possessed a wide variation of range. Possible error sources such as position error, radar calibration error, and temporal data collection differences, were minimized so that range dependency could be focused on. Range dependent beam spreading influenced precipitation classification over the largest span of ranges, and the greatest portion of the data. Also, beam spreading was found to increase the horizontal extent of precipitation areas in a direction perpendicular to the central axis of the radar beam. Overall, using the Steiner and Houze classification method, 24.0% and 21.6% of the precipitation with reflectivity greater than 15 dBZ was classified differently by the two radar data sets at the 1.5 km and 3.0 km analysis levels respectively. The percentage of total rainfall from all precipitation classified differently was 26% for the 1.5 km analysis level, and 28% for the 3.0 km level.

Wood, David Richard

1996-01-01T23:59:59.000Z

379

ARM Climate Research Facility Radar Operations Plan  

SciTech Connect

Roles, responsibilities, and processes associated with Atmospheric Radiation Measurement (ARM) Radar Operations.

Voyles, JW

2012-05-18T23:59:59.000Z

380

The Atmospheric Imaging Radar: Simultaneous Volumetric Observations Using a Phased Array Weather Radar  

Science Conference Proceedings (OSTI)

Mobile weather radars often utilize rapid-scan strategies when collecting observations of severe weather. Various techniques have been used to improve volume update times, including the use of agile and multibeam radars. Imaging radars, similar in ...

Bradley Isom; Robert Palmer; Redmond Kelley; John Meier; David Bodine; Mark Yeary; Boon-Leng Cheong; Yan Zhang; Tian-You Yu; Michael I. Biggerstaff

2013-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Effects of Radar Beam Shielding on Rainfall Estimation for the Polarimetric C-Band Radar  

Science Conference Proceedings (OSTI)

Radar reflectivity (Zh), differential reflectivity (Zdr), and specific differential phase (Kdp) measured from the operational, polarimetric weather radar located in Trappes, France, were used to examine the effects of radar beam shielding on ...

Katja Friedrich; Urs Germann; Jonathan J. Gourley; Pierre Tabary

2007-11-01T23:59:59.000Z

382

Polarimetry for Weather Surveillance Radars  

Science Conference Proceedings (OSTI)

This paper is an overview of weather radar polarimetry emphasizing surveillance applications. The following potential benefits to operations are identified: improvement of quantitative precipitation measurements, discrimination of hail from rain ...

Dusan S. Zrnic; Alexander V. Ryzhkov

1999-03-01T23:59:59.000Z

383

Radar Reflectivity of Cumulus Clouds  

Science Conference Proceedings (OSTI)

The relationships between the radar reflectivity factor Z and significant physical cloud parameters are studied from a dataset collected with an instrumented aircraft in non- or very weakly precipitating warm clouds. The cloud droplet populations ...

Henri Sauvageot; Jilani Omar

1987-06-01T23:59:59.000Z

384

Radar Calibration: Some Simple Approaches  

Science Conference Proceedings (OSTI)

The proper calibration of weather radars has been at the heart of the problem of accurate reflectivity measurements for more than five decades. This paper summarizes a number of methods that have been used previously and others that areworthy of ...

David Atlas

2002-09-01T23:59:59.000Z

385

C NMR Spectra C NMR Spectra  

E-Print Network (OSTI)

S16 1 H and 13 C NMR Spectra (see p S3) Me N-i-Pr #12;S17 1 H and 13 C NMR Spectra (see p S3) Me NBn #12;S18 1 H and 13 C NMR Spectra (see p S4) NBn #12;S19 1 H and 13 C NMR Spectra (see p S4) NBn Me Me Me #12;S20 1 H and 13 C NMR Spectra (see p S4) N-n-Bu Me Me Me #12;S21 1 H and 13 C NMR Spectra

Collum, David B.

386

Establishing a Conventional Doppler Sodar cum Doppler Minisodar at the National Physical Laboratory  

Science Conference Proceedings (OSTI)

A personal computer–based three-axis Doppler sodar, capable of working in Doppler minisodar mode too, has been established at the National Physical Laboratory, New Delhi, India. The fast Fourier transform technique has been used to extract the ...

B. S. Gera; S. P. Singal; Neeraj Saxena

1997-06-01T23:59:59.000Z

387

Definition: Synthetic Aperture Radar | Open Energy Information  

Open Energy Info (EERE)

Aperture Radar Aperture Radar Jump to: navigation, search Dictionary.png Synthetic Aperture Radar Synthetic-aperture radar (SAR) is an active microwave remote sensing technology that measures the phase difference between a radar wave emitted from an antennae attached to a satellite or aircraft to generate high-resolution images of a surface.[1] View on Wikipedia Wikipedia Definition Also Known As SAR Related Terms radar References ↑ Synthetic Aperature Radar: Systems and Signal Processing (Curlander and McDonough - 1991 - book) fue LikeLike UnlikeLike You like this.Sign Up to see what your friends like. l cell, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Synthetic_Aperture_Radar&oldid=493069" Category: Definitions What links here Related changes

388

Definition: Interferometric Synthetic Aperture Radar | Open Energy  

Open Energy Info (EERE)

Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar Jump to: navigation, search Dictionary.png Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar (InSAR) utilizes SAR images from two different time periods to generate maps of surface deformation. The technique can potentially measure millimeter-scale changes in the Earth's surface.[1][2] View on Wikipedia Wikipedia Definition Also Known As InSAR, IfSAR Related Terms Synthetic Aperture Radar, radar, sustainability References ↑ Synthetic Aperture Radar Interferometry to Measure Earth's Surface Topography and Its Deformation (Burgmann et al. 2000) ↑ Improved Visulaization of Satellite Radar InSAR Observed Structural Controls at Producing Geothermal Field Using Modeled Horizontal Surface Displacements(Opplinger et al. 2006)

389

Obstacle penetrating dynamic radar imaging system  

DOE Patents (OSTI)

An obstacle penetrating dynamic radar imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband radar units that produce a set of return radar signals from the individual, animal, or object, and a processing system for said set of return radar signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a radar video system for detecting and tracking an individual, animal, or object by producing a set of return radar signals from the individual, animal, or object with a multiplicity of low power ultra wideband radar units, and processing said set of return radar signals for detecting and tracking of the individual, animal, or object.

Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)

2006-12-12T23:59:59.000Z

390

Synthetic Aperture Radar Imagery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Imagery Sandia has collected and real-time processed over 400,000 synthetic aperture radar images. The following is a selection of imagery available for...

391

ARMAR: An Airborne Rain-Mapping Radar  

Science Conference Proceedings (OSTI)

A new airborne rain-mapping radar (ARMAR) has been developed by NASA and the Jet Propulsion Laboratory for operation on the NASA Ames DC-8 aircraft. The radar operates at 13.8 GHz, the frequency to be used by the radar on the Tropical Rainfall ...

S. L. Durden; E. Im; F. K. Li; W. Ricketts; A. Tanner; W. Wilson

1994-06-01T23:59:59.000Z

392

Near-Surface Vortex Structure in a Tornado and in a Sub-Tornado-Strength, Convective-Storm Vortex Observed by a Mobile, W-Band Radar During VORTEX2  

Science Conference Proceedings (OSTI)

As part of the VORTEX2 field campaign, a very high-resolution, mobile, W-band Doppler radar collected near-surface (?200 m AGL) observations in an EF-0 tornado near Tribune, Kansas on 25 May 2010 and in sub-tornado-strength vortices near Prospect ...

Robin L. Tanamachi; Howard B. Bluestein; Ming Xue; Wen-Chau Lee; Krzysztof A. Orzel; Stephen J. Frasier; Roger M. Wakimoto

393

C-Band Scanning ARM Precipitation Radar (C-SAPR) Handbook  

Science Conference Proceedings (OSTI)

The C-band scanning ARM precipitation radar (C-SAPR) is a scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 350-kW magnetron transmitter, this puts 125 kW of transmitted power for each polarization. The receiver for the C-SAPR is a National Center for Atmospheric Research (NCAR) -developed Hi-Q system operating in a coherent-on-receive mode. The ARM Climate Research Facility operates two C-SAPRs; one of them is deployed near the Southern Great Plains (SGP) Central Facility near the triangular array of X-SAPRs, and the second C-SAPR is deployed at ARM’s Tropical Western Pacific (TWP) site on Manus Island in Papua New Guinea.

Widener, K; Bharadwaj, N

2012-11-13T23:59:59.000Z

394

Microwave emissions from police radar  

E-Print Network (OSTI)

The purpose of this study was to evaluate police officers exposures to microwaves emitted by traffic radar units at the ocular and testicular level. Additionally, comparisons were made of the radar manufacturers published maximum power density specifications and actual measured power densities taken at the antenna face of those units. Four different speed enforcement agencies and one transportation research institute provided fifty four different radar units for evaluation. Of those units, nine dash mounted. five rear mounted, and three hand held models were included. During this study, only four of the 986 measurements taken exceeded the American National Standards Institute(ANSI) limit of 5 MW/CM2 , and none exceeded the American Conference of Governmental Industrial Hygienists(ACGIH), Institute of Electrical and Electronic Engineers(IEEE), or Occupational Safety and Health Administration(OSHA) standard of 10 MW/CM2 . None of the 812 measurements taken at the officers seated ocular and testicular positions exceeded .04 MW/CM2. In fact, the highest reading observed in the drivers' position was .034 MW/CM2 taken at the 5th percentile testicular level, less than 1% of the lowest current safety standard. Because of the confusion that exists in the medical and scientific communities concerning non-ionizing radiation, the extent of health risks associated with long term exposure to police radar is not yet known. Until science has indisputably proven that long term, low power exposure is not harmful, it is recommended that police departments take steps to limit officer exposure. There are several ways that police departments can limit exposure cheaply and with minimal effort. The purchasing department should first consider radar units with the lowest published maximum power densities. New hand held radar units should not be purchased because they leave open the opportunity for operators to place their bodies in the radar beam path. Purchasing units whose antennae mount outside the patrol vehicle will also lower exposure to microwaves. Finally, training that stresses the importance of using the radar units' stand-by mode when not actually monitoring traffic will further limit exposure.

Fink, John Michael

1994-01-01T23:59:59.000Z

395

Tornado Detection Using a Neuro–Fuzzy System to Integrate Shear and Spectral Signatures  

Science Conference Proceedings (OSTI)

Tornado vortices observed from Doppler radars are often associated with strong azimuthal shear and Doppler spectra that are wide and flattened. The current operational tornado detection algorithm (TDA) primarily searches for shear signatures that ...

Yadong Wang; Tian-You Yu; Mark Yeary; Alan Shapiro; Shamim Nemati; Michael Foster; David L. Andra Jr.; Michael Jain

2008-07-01T23:59:59.000Z

396

Chromospheric Doppler Velocity Oscillations in a Sunspot  

E-Print Network (OSTI)

We analyse the chromospheric Doppler velocity oscillations in a sunspot using the high resolution spectral observations obtained from the Fast Imaging Solar Spectrograph(FISS) of the New Solar Telescope at the Big Bear Solar Observatory. The Doppler velocity maps are constructed from the bisectors of the spectral observations. The time series analysis of Doppler velocity maps show enhanced power in the sunspot umbra at higher frequencies and in the penumbra at lower frequencies. We find that the peak power frequency decreases gradually from the umbra to outward.

Maurya, R A

2013-01-01T23:59:59.000Z

397

Field Training in Radar Meteorology  

Science Conference Proceedings (OSTI)

The NSF Division of Mesoscale Meteorology and the University of Nevada—Reno (UNR) provided support for a two-week field course at the CSU—CHILL radar during 12—24 May 1991. Ten atmospheric science graduate students and two faculty from the Desert ...

John Hallett; Melanie Wetzel; Steven Rutledge

1993-01-01T23:59:59.000Z

398

An Autonomous Doppler Sodar Wind Profiling System  

Science Conference Proceedings (OSTI)

An autonomous Doppler sodar wind profiling system has been designed, built, tested, and then deployed for 2 years at a remote site in Coats Land, Antarctica. The system is designed around a commercially available phased-array sodar (a Scintec ...

Philip S. Anderson; Russell S. Ladkin; Ian A. Renfrew

2005-09-01T23:59:59.000Z

399

Doppler Lidar Observations of a Downslope Windstorm  

Science Conference Proceedings (OSTI)

During January and February 1987, the NOAA/WPL pulsed Doppler lidar was deployed in the foothills west of Boulder, Colorado, to study orographically induced flows over the Continental Divide. On 29 January 1987, the lidar, with its unique spatial ...

Paul J. Neiman; R. M. Hardesty; M. A. Shapiro; R. E. Cupp

1988-11-01T23:59:59.000Z

400

High-Temporal-Resolution Capabilities of the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

Since 2007 the advancement of the National Weather Radar Testbed Phased-Array Radar (NWRT PAR) hardware and software capabilities has been supporting the implementation of high-temporal-resolution (1 min) sampling. To achieve the increase in ...

Pamela L. Heinselman; Sebastián M. Torres

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect  

Science Conference Proceedings (OSTI)

The aspect angle, a measurement of the aspect sensitivity of atmospheric refractivity irregularities, was estimated with multiple-receiver coherent radar imaging (CRI) of very high frequency (VHF) atmospheric radar. Two CRI parameters retrieved by ...

Jenn-Shyong Chen; Jun-ichi Furumoto

2013-02-01T23:59:59.000Z

402

The Use of TRMM Precipitation Radar Observations in Determining Ground Radar Calibration Biases  

Science Conference Proceedings (OSTI)

Since the successful launch of the Tropical Rainfall Measuring Mission (TRMM) satellite, measurements of a wide variety of precipitating systems have been obtained with unprecedented detail from the first space-based radar [precipitation radar (...

Emmanouil N. Anagnostou; Carlos A. Morales; Tufa Dinku

2001-04-01T23:59:59.000Z

403

Monitoring the Reflectivity Calibration of a Scanning Radar Using a Profiling Radar and a Disdrometer  

Science Conference Proceedings (OSTI)

This paper describes a method of absolutely calibrating and routinely monitoring the reflectivity calibration from a scanning weather radar using a vertically profiling radar that has been absolutely calibrated using a collocated surface ...

Christopher R. Williams; Kenneth S. Gage; Wallace Clark; Paul Kucera

2005-07-01T23:59:59.000Z

404

Mean winds observed with Indian MST radar over tropical mesosphere and comparison with various techniques  

E-Print Network (OSTI)

Abstract. Temporal variation of mean winds between the 65 to 85 km height region from the data collected over the course of approximately four years (1995–99), using the Indian MST radar located at Gadanki (13.5 ? N, 79.2 ? E), India is presented in this paper. Mesospheric mean winds and their seasonal variation in the horizontal and vertical components are presented in detail. Westward flows during each of the equinoxes and eastward flows during the solstices are observed in the zonal component. The features of the semiannual oscillation (SAO) and the quasi-biennial oscillation (QBO) in the zonal component are noted. In the meridional component, contours reveal a northward motion during the winter and a southward motion during the summer. Large inter-annual variability is found in the vertical component with magnitudes of the order of ±2 ms ?1. The MST observed winds are also compared with the winds observed by the MF radar located at Tirunelveli (8.7 ? N, 77.8 ? E), India, the High Resolution Doppler Imager (HRDI) onboard the Upper Atmospheric Research Satellite (UARS), and with the CIRA-86 model. A very good agreement is found between both the ground-based instruments (MST radar and MF radar) in the zonal component and there are few discrepancies in the meridional component. UARS/HRDI observed winds usually have larger magnitudes than the ground-based mean winds. Comparison of the MST derived winds with the CIRA-86 model in the zonal component shows that during the spring equinox and the summer, the winds agree fairly well, but there are a lot of discrepancies in the other seasons and the observed winds with the MST radar are less in magnitude, though the direction is same. The strengths and limitations in estimating reliable mesospheric mean winds using

M. Venkat Ratnam; D. Narayana Rao; T. Narayana Rao; S. Thulasiraman; J. B. Nee; S. Gurubaran; R. Rajaram

2000-01-01T23:59:59.000Z

405

The 30th International Conference on Radar Meteorology  

Science Conference Proceedings (OSTI)

The 30th International Conference on Radar Meteorology, held in Munich, Germany, 19–24 July 2001, highlighted recent progress in the field of radar meteorology and demonstrated how radar is used in many integrated ways to better understand and ...

Matthias Steiner; Peter F. Meischner

2002-11-01T23:59:59.000Z

406

Application of the Multigrid Method to the Two-Dimensional Doppler Radar Radial Velocity Data Assimilation  

Science Conference Proceedings (OSTI)

In recent years, the Earth System Research Laboratory (ESRL) of the National Oceanic and Atmospheric Administration (NOAA) has developed a space and time mesoscale analysis system (STMAS), which is currently a sequential three-dimensional ...

Wei Li; Yuanfu Xie; Shiow-Ming Deng; Qi Wang

2010-02-01T23:59:59.000Z

407

Phase Coding for Range Ambiguity Mitigation in Dual-Polarized Doppler Weather Radars  

Science Conference Proceedings (OSTI)

This paper evaluates the retrieval of polarimetric variables when phase-coded waveforms are employed to suppress range overlaid echoes. A phase-coded waveform tags transmitted pulses with a phase code and then decodes the received signal to ...

N. Bharadwaj; V. Chandrasekar

2007-08-01T23:59:59.000Z

408

The Kellerville Tornado during VORTEX: Damage Survey and Doppler Radar Analyses  

Science Conference Proceedings (OSTI)

A detailed aerial and ground survey of a long-track (50 km) F5 tornado is presented. The survey revealed that the tornado exhibited unusual nonlinear movements at two different locations. One portion of the track was associated with a pronounced ...

Roger M. Wakimoto; Hanne V. Murphey; David C. Dowell; Howard B. Bluestein

2003-10-01T23:59:59.000Z

409

Mesovortex Circulations Seen by Airborne Doppler Radar within a Bow-Echo Mesoscale Convective System  

Science Conference Proceedings (OSTI)

During the spring of 1991, scientists from the National Severe Storms Laboratory conducted a field observational program to obtain a better understanding of the processes responsible for organizing and maintaining the dynamical and electrical ...

David P. Jorgensen; Bradley F. Smull

1993-11-01T23:59:59.000Z

410

Dual-Doppler and Multiparameter Radar Observations of a Bow-Echo Hailstorm  

Science Conference Proceedings (OSTI)

During the afternoon and evening hours of 23 May 1991 a hail-producing multicellular severe thunderstorm developed near Denver, Colorado, and tracked eastward for more than 100 km. Along this path, hailstone diameters of 2–7 cm (0.75–2.75 in.) ...

Patrick C. Kennedy; Steven A. Rutledge

1995-04-01T23:59:59.000Z

411

Finescale Vertical Structure of a Cold Front as Revealed by an Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

In the afternoon of 24 May 2002, a well-defined and frontogenetic cold front moved through the Texas panhandle. Detailed observations from a series of platforms were collected near the triple point between this cold front and a dryline boundary.

Bart Geerts; Rick Damiani; Samuel Haimov

2006-01-01T23:59:59.000Z

412

A Method to Identify Convective Cells within Multicell Thunderstorms from Multiple Doppler Radar Data  

Science Conference Proceedings (OSTI)

Convective cell identification methods, besides their operational utility, are useful to identify cells, to understand cell interactions within multicell thunderstorms, and to distinguish between convective and stratiform regions within mesoscale ...

James R. Stalker; Kevin R. Knupp

2002-01-01T23:59:59.000Z

413

Retrieval of Vertical Profiles of Cirrus Cloud Microphysical Parameters from Doppler Radar and Infrared Radiometer Measurements  

Science Conference Proceedings (OSTI)

This paper describes a new method to retrieve vertical profiles of the parameters of cirrus cloud microphysics that are important for the estimation of climatic feedback. These parameters are the particle characteristic size and ice mass content. ...

S. Y. Matrosov; B. W. Orr; R. A. Kropfli; J. B. Snider

1994-05-01T23:59:59.000Z

414

Signal Processing Algorithms for the Terminal Doppler Weather Radar: Build 2  

E-Print Network (OSTI)

, Massachusetts Prepared for the Federal Aviation Administration, Washington, DC 20591 This document is available Administration, Washington, DC 20591 This document is available to the public through the National Technical # > N_GATES_BD? Compute W PDC > DC_THRES? Window data Compute clutter spectral width Spectral GCF PC > 0

Cho, John Y. N.

415

Sampling Strategies for Tornado and Mesocyclone Detection Using Dynamically Adaptive Doppler Radars: A Simulation Study  

Science Conference Proceedings (OSTI)

Increasing tornado and severe storm warning lead time (lead time is defined here as the elapsed time between the issuance of a watch or warning and the time at which the anticipated weather event first impacts the specified region) through the ...

Jessica L. Proud; Kelvin K. Droegemeier; Vincent T. Wood; Rodger A. Brown

2009-03-01T23:59:59.000Z

416

Doppler Profiler and Radar Observations of Boundary Layer Variability during the Landfall of Tropical Storm Gabrielle  

Science Conference Proceedings (OSTI)

Detailed observations of boundary layer structure were acquired on 14 September 2001, prior to and during the landfall of Tropical Storm Gabrielle. The Mobile Integrated Profiling System (MIPS) and the Shared Mobile Atmospheric Research and ...

Kevin R. Knupp; Justin Walters; Michael Biggerstaff

2006-01-01T23:59:59.000Z

417

Studies of Velocity Fluctuations in the Lower Atmosphere Using the MU Radar. Part II: Momentum Fluxes and Energy Densities  

Science Conference Proceedings (OSTI)

This paper describes a study of the frequency spectra, the vertical profiles of energy density, and the momentum flux of the motion field observed during a six-day campaign in March 1986 using the MU Radar in Shigaraki, Japan. Our results reveal ...

David C. Fritts; Toshitaka Tsuda; Thomas E. VanZandt; Steven A. Smith; Toru Sato; Shoichiro Fukao; Susumu Kato

1990-01-01T23:59:59.000Z

418

Two terminal micropower radar sensor  

DOE Patents (OSTI)

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground. 3 figs.

McEwan, T.E.

1995-11-07T23:59:59.000Z

419

Two terminal micropower radar sensor  

SciTech Connect

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

420

Ultra-wideband radar motion sensor  

DOE Patents (OSTI)

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion. 15 figs.

McEwan, T.E.

1994-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Power Spectra of Oblique Velocities in the Troposphere and Lower Stratosphere Observed at Arecibo, Puerto Rico  

Science Conference Proceedings (OSTI)

Wind profiles measured with the Arecibo Observatory 430 MHz radar during 1979 and 1980 have been used to calculate frequency and radial wavenumber power spectra. Periods between 2 min and 6 h and vertical wavelength between 300 m and 13.5 km are ...

M. F. Larsen; R. F. Woodman; T. Sato; M. K. Davis

1986-10-01T23:59:59.000Z

422

Retrieval of Precipitation Profiles from Airborne Radar and Passive Radiometer Measurements: Comparison with Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

This study compares precipitation rate profiles derived from a single frequency radar and radiometer with such profiles derived from a dual-frequency radar.

J. A. Weinman; R. Meneghini; K. Nakamura

1990-10-01T23:59:59.000Z

423

Laser Doppler Velocimeter particle velocity measurement system  

DOE Green Energy (OSTI)

This report gives a detailed description of the operation of the Laser Doppler Velocimeter (LDV) system maintained by DIAL at MSU. LDV is used for the measurement of flow velocities and turbulence levels in various fluid flow settings. Ills report details the operation and maintenance of the LDV system and provides a first-time user with pertinent information regarding the system`s setup for a particular application. Particular attention has been given to the use of the Doppler signal analyzer (DSA) and the burst spectrum analyzer (BSA) signal processors and data analysis.

Wilson, W.W.; Srikantaiah, D.V.; Philip, T.; George, A.

1993-10-01T23:59:59.000Z

424

Evaluated Infrared Spectra  

Science Conference Proceedings (OSTI)

... usually not very far from the “natural” resolution of ... be significantly different as a pure liquid or solid ... and can differ drastically from gas phase spectra. ...

2013-07-15T23:59:59.000Z

425

Ultra-wideband radar sensors and networks  

DOE Patents (OSTI)

Ultra wideband radar motion sensors strategically placed in an area of interest communicate with a wireless ad hoc network to provide remote area surveillance. Swept range impulse radar and a heart and respiration monitor combined with the motion sensor further improves discrimination.

Leach, Jr., Richard R; Nekoogar, Faranak; Haugen, Peter C

2013-08-06T23:59:59.000Z

426

Radar Determination of Snowfall Rate and Accumulation  

Science Conference Proceedings (OSTI)

A unique method that provides for relating radar-measured reflectivity factors to snowfall rates at the ground is presented. Data were provided by a CPS-9, 3.2 cm radar from six 1978 Massachusetts snowstorms A best-fit power-law relationship ...

Roland J. Boucher; James G. Wieler

1985-01-01T23:59:59.000Z

427

Utilizing Spaceborne Radars to Retrieve Dry Snowfall  

Science Conference Proceedings (OSTI)

A dataset consisting of one year of CloudSat Cloud Profiling Radar (CPR) near-surface radar reflectivity Z associated with dry snowfall is examined in this study. The CPR observations are converted to snowfall rates S using derived Ze–S ...

Mark S. Kulie; Ralf Bennartz

2009-12-01T23:59:59.000Z

428

Evaluation of the Acoustic Doppler Velocimeter (ADV) for Turbulence Measurements*  

Science Conference Proceedings (OSTI)

Accuracy of the acoustic Doppler velocimeter (ADV) is evaluated in this paper. Simultaneous measurements of open-channel flow were undertaken in a 17-m flume using an ADV and a laser Doppler velocimeter. Flow velocity records obtained by both ...

G. Voulgaris; J. H. Trowbridge

1998-02-01T23:59:59.000Z

429

Doppler cooling to the Quantum limit M. Chalony,1  

E-Print Network (OSTI)

atom is cooled because of the difference in absorption probabilities, induced by the Doppler effectDoppler cooling to the Quantum limit M. Chalony,1 A. Kastberg,2 B. Klappauf,3 and D. Wilkowski1, 4: July 12, 2011) Doppler cooling on a narrow transition is limited by the noise of single scattering

430

Dual-Doppler and Single-Doppler Analysis of a Tornadic Storm Undergoing Mergers and Repeated Tornadogenesis  

Science Conference Proceedings (OSTI)

Dual-Doppler observations with unprecedented finescale spatial and temporal resolution are used to characterize the vector wind field in and near a tornado occurring near Kiefer, Oklahoma, on 26 May 1997. Analyses of the dual-Doppler vector wind ...

Joshua Wurman; Yvette Richardson; Curtis Alexander; Stephen Weygandt; Peng Fei Zhang

2007-03-01T23:59:59.000Z

431

Intercomparison of Wind Measurements from Two Acoustic Doppler Sodars, a Laser Doppler Lidar, and In Situ Sensors  

Science Conference Proceedings (OSTI)

Intercomparative measurements of wind speed, wind direction, wind direction standard deviation, and vertical wind standard deviation from two acoustic Doppler sodars and a laser Doppler lidar are studied, using the BAO tower to provide reference ...

Prasan Chintawongvanich; Robert Olsen; Christopher A. Biltoft

1989-10-01T23:59:59.000Z

432

Airborne Doppler Lidar Wind Field Measurements  

Science Conference Proceedings (OSTI)

A coherent Doppler lidar has been used in an aircraft to measure the 2-dimensional wind field in a number of different atmospheric situations. The lidar, a pulsed CO2 system, was installed in the NASA Convair 990. Galileo II, and flown in a ...

J. Bilbro; G. Fichtl; D. Fitzjarrald; M. Krause; R. Lee

1984-04-01T23:59:59.000Z

433

LLNL-TR-534931 Doppler Broadening Update  

E-Print Network (OSTI)

LLNL-TR-534931 Doppler Broadening Update: Broadening near the Unresolved Resonance Region.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. #12;3 LLNL version of this paper: John Scorby (LLNL), Robert MacFarlane (LANL), Maurice Greene (ORNL), S. Ganesan

Cullen, Red

434

DOE/SC-ARM-12-009 ARM Radar Organization JW Voyles  

NLE Websites -- All DOE Office Websites (Extended Search)

Bharadwaj Radar Calibration Plan, controlled document Nitin Bharadwaj Instrument Handbooks, controlled documents Kevin Widener Radar status and information: www.radar.arm.gov...

435

IMPROVED CAPABILITIES FOR SITING WIND FARMS AND MITIGATING IMPACTS ON RADAR OBSERVATIONS  

DOE Green Energy (OSTI)

The development of efficient wind energy production involves challenges in technology and interoperability with other systems critical to the national mission. Wind turbines impact radar measurements as a result of their large reflectivity cross section as well as through the Doppler phase shift of their rotating blades. Wind farms can interfere with operational radar in multiple contexts, with degradation impacts on: weather detection such as tornado location, wind shear, and precipitation monitoring; tracking of airplanes where air traffic control software can lose the tracks of aircraft; and in identification of other low flying targets where a wind farm located close to a border might create a dead zone for detecting intruding objects. Objects in the path of an electromagnetic wave affect its propagation characteristics. This includes actual blockage of wave propagation by large individual objects and interference in wave continuity due to diffraction of the beam by individual or multiple objects. As an evolving industry, and the fastest growing segment of the energy sector, wind power is poised to make significant contributions in future energy generation requirements. The ability to develop comprehensive strategies for designing wind turbine locations that are mutually beneficial to both the wind industry that is dependent on production, and radar sites which the nation relies on, is critical to establishing reliable and secure wind energy. The mission needs of the Department of Homeland Security (DHS), Department of Defense (DOD), Federal Aviation Administration (FAA), and National Oceanographic and Atmospheric Administration (NOAA) dictate that the nation's radar systems remain uninhibited, to the maximum extent possible, by man-made obstructions; however, wind turbines can and do impact the surveillance footprint for monitoring airspace both for national defense as well as critical weather conditions which can impact life and property. As a result, a number of potential wind power locations have been contested on the basis of radar line of site. Radar line of site is dependent on local topography, and varies with atmospheric refractive index which is affected by weather and geographic conditions.

Chiswell, S.

2010-01-15T23:59:59.000Z

436

Virtual CSU-CHILL Radar: The VCHILL  

Science Conference Proceedings (OSTI)

The Virtual CHILL (VCHILL) system makes it possible to transfer the educational and research experience of the Colorado State University dual polarization radar to remote locations over the Internet. The VCHILL operation includes remote control ...

V. Chandrasekar; Yoong-Goog Cho; D. Brunkow; A. Jayasumana

2005-07-01T23:59:59.000Z

437

Mean Radar Echo Characteristics during Project GALE  

Science Conference Proceedings (OSTI)

The mean radar echo characteristics during the Genesis of Atlantic Lows Experiment (GALE) are presented for the southeastern United States during the 15 January–15 March 1986 field phase of the program. The echo characteristics were derived from ...

Thomas J. Trunk; Lance F. Bosart

1990-02-01T23:59:59.000Z

438

Optimization of Multiparameter Radar Estimates of Rainfall  

Science Conference Proceedings (OSTI)

The estimates of rainfall rate derived from a multiparameter radar based on reflectivity factor (RZH), differential reflectivity (RDR), and specific differential propagation phase (RDP) have widely varying accuracies over the dynamic range of the ...

V. Chandrasekar; Eugenio Gorgucci; Gianfranco Scarchilli

1993-07-01T23:59:59.000Z

439

On the Sensitivity of Weather Radars  

Science Conference Proceedings (OSTI)

This paper discusses the subject of weather radar system sensitivity from a general point of view, with emphasis an the influence of wavelength. Expressions for the echo signal-to-noise ratio are examined using a detection theory approach to ...

Paul L. Smith

1986-12-01T23:59:59.000Z

440

Radar Backscattering by Inhomogeneous Precipitation Particles  

Science Conference Proceedings (OSTI)

Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. ...

Craig F. Bohren; Louis J. Battan

1980-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Radar and Radiation Properties of Ice Clouds  

Science Conference Proceedings (OSTI)

The authors derive relations of the equivalent radar reflectivity Ze and extinction coefficient ? of ice clouds and confirm the theory by in situ aircraft observations during the First International Satellite Cloud Climatology Project Regional ...

David Atlas; Sergey Y. Matrosov; Andrew J. Heymsfield; Ming-Dah Chou; David B. Wolff

1995-11-01T23:59:59.000Z

442

Radar Observations of a Major Industrial Fire  

Science Conference Proceedings (OSTI)

On 23 May 1996, a Montreal suburban paint factory containing several hundred thousand gallons of paints, solvents, and other chemicals burned to the ground in a spectacular fire. The smoke plume from the fire was readily detected by three radars ...

R. R. Rogers; W. O. J. Brown

1997-05-01T23:59:59.000Z

443

Radar System Errors in Polarization Diversity Measurements  

Science Conference Proceedings (OSTI)

The measurement capability of a polarization diversity radar is limited by several characteristics of the system and particularly by the performance of the antenna, which is characterized by the integrated cancellation ratio or integrated cross-...

James I. Metcalf; James S. Ussailis

1984-06-01T23:59:59.000Z

444

Doppler cooling three-electronic-level molecules  

E-Print Network (OSTI)

Analogous to the extension of laser cooling techniques from two-level to three-level atoms, Doppler cooling of molecules with an intermediate electronic state is considered. In particular, we use a rate-equation approach to simulate cooling of SiO+, in which population buildup in the intermediate state is prevented by its short lifetime. We determine that Doppler cooling of SiO+ can be accomplished without optically repumping from the intermediate state, at the cost of causing undesirable parity flips and rotational diffusion. Since the necessary repumping would require a large number of continuous-wave lasers, optical pulse shaping of a femtosecond laser is proposed as an attractive alternative. Other candidate three-electron-level molecules are also discussed.

Nguyen, J H V

2010-01-01T23:59:59.000Z

445

ROTATIONAL DOPPLER BEAMING IN ECLIPSING BINARIES  

SciTech Connect

In eclipsing binaries the stellar rotation of the two components will cause a rotational Doppler beaming during eclipse ingress and egress when only part of the eclipsed component is covered. For eclipsing binaries with fast spinning components this photometric analog of the well-known spectroscopic Rossiter-McLaughlin effect can exceed the strength of the orbital effect. Example light curves are shown for a detached double white dwarf binary, a massive O-star binary and a transiting exoplanet case, similar to WASP-33b. Inclusion of the rotational Doppler beaming in eclipsing systems is a prerequisite for deriving the correct stellar parameters from fitting high-quality photometric light curves and can be used to determine stellar obliquities as well as, e.g., an independent measure of the rotational velocity in those systems that may be expected to be fully synchronized.

Groot, Paul J., E-mail: pgroot@astro.ru.nl [Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)

2012-01-20T23:59:59.000Z

446

Ground Penetrating Imaging Radar Phase II  

Science Conference Proceedings (OSTI)

EPRI project "Ground Penetrating Imaging Radar Phase II," also called the "GPiR Project," started in August 1998 at Schlumberger-Doll Research, a division of Schlumberger Technology Corporation. Its goal was to determine if modern ground-penetrating radar (GPR) could make three-dimensional (3D) images of buried utility lines accurate and detailed enough to help utility companies better manage their underground infrastructure. Work began with a comparison of commercial and prototype GPR systems in the lab...

2001-06-20T23:59:59.000Z

447

Nonuniform Beamfilling Correction for Spaceborne Radar Rainfall Measurement: Implications from TOGA COARE Radar Data Analysis  

Science Conference Proceedings (OSTI)

A method is studied to make a nonuniform beamfilling (NUBF) correction for the path-integrated attenuation (PIA) derived from spaceborne radar measurement. The key of this method is to estimate rain-rate variability within a radar field of view ...

Toshiaki Kozu; Toshio Iguchi

1999-11-01T23:59:59.000Z

448

An 11-cm Coherent Polarimetric Radar for Meteorological Research  

Science Conference Proceedings (OSTI)

The Geophysics Directorate of the U.S. Air Force developed a unique 11-cm (S-band) coherent polarimetric radar. The radar can transmit signals of alternating orthogonal polarizations, with either circular or linear basis, and receive signals of ...

James I. Metcalf; Alexander W. Bishop; Richard C. Chanley; Timothy C. Hiett; Pio J. Petrocchi

1993-06-01T23:59:59.000Z

449

Dual-Polarization Radar Characteristics of an Apartment Fire  

Science Conference Proceedings (OSTI)

Dual-polarimetric microwave wavelength radar observations of an apartment fire in Huntsville, Alabama, on 3 March 2008 are examined to determine the radar-observable properties of ash and fire debris lofted into the atmosphere. Dual-polarimetric ...

Thomas A. Jones; Sundar A. Christopher; Walt Petersen

2009-10-01T23:59:59.000Z

450

Retrieval of Reflectivity in a Networked Radar Environment  

Science Conference Proceedings (OSTI)

A system for reflectivity and attenuation retrieval for rain medium in a networked radar environment is described. Electromagnetic waves backscattered from a common volume in networked radar systems are attenuated differently along the different ...

V. Chandrasekar; S. Lim

2008-10-01T23:59:59.000Z

451

Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach  

Science Conference Proceedings (OSTI)

From the Publisher:Spotlight-mode Synthetic Aperture Radar: A Signal Processing Approach describes an important mode of synthetic aperture radar (SAR) imaging, known as spotlight-mode SAR. By treating the subject via the principles of signal processing, ...

Paul Thompson; Daniel E. Wahl; Paul H. Eichel; Dennis C. Ghiglia; Charles V. Jakowatz

1996-01-01T23:59:59.000Z

452

Auxiliary Signal Processing System for a Multiparameter Radar  

Science Conference Proceedings (OSTI)

The design of an auxiliary signal processor for a multiparameter radar is described with emphasis on low cost, quick development, and minimum disruption of radar operations. The processor is based around a low-cost digital signal processor card ...

V. Chandrasekar; G. R. Gray; I. J. Caylor

1993-06-01T23:59:59.000Z

453

Factors Affecting the Accuracy of SHOWEX HF Radar Wave Measurements  

Science Conference Proceedings (OSTI)

Ocean Surface Current Radar (OSCR) HF radar measurements of ocean waves and currents were made during the Shoaling Waves Experiment (SHOWEX) in the fall of 1999. During some periods, at some locations, good quality wave measurements were ...

Lucy R. Wyatt; Guennadi Liakhovetski; Hans C. Graber; Brian K. Haus

2005-07-01T23:59:59.000Z

454

A Dual-Wavelength Radar Method to Measure Snowfall Rate  

Science Conference Proceedings (OSTI)

A dual-wavelength radar method to estimate snowfall rate has been developed. The method suggests taking simultaneous and collocated reflectivity measurements at two radar wavelengths. Snowfall backscattering at one of these wavelengths should be ...

Sergey Y. Matrosov

1998-11-01T23:59:59.000Z

455

International Weather-Radar Networking in Western Europe  

Science Conference Proceedings (OSTI)

During the last few years there has been considerable activity in Western Europe aimed at establishing national radar networks. Concurrent with this work, several bilateral agreements to exchange weather-radar data across national boundaries have ...

C. G. Collier; C. A. Fair; D. H. Newsome

1988-01-01T23:59:59.000Z

456

95-GHz Polarimetric Radar Measurements of Orographic Cap Clouds  

Science Conference Proceedings (OSTI)

The use of millimeter-wavelength radars for cloud microphysical research was investigated in experiments at the Elk Mountain Observatory near Laramie, Wyoming, between April 1990 and March 1992. The 95-GHz polarimetric radar used in these ...

Andrew Pazmany; James Mead; Robert McIntosh; Mark Hervig; Robert Kelly; Gabor Vali

1994-02-01T23:59:59.000Z

457

Comparison of Dual-Polarization Radar Estimators of Rain  

Science Conference Proceedings (OSTI)

Several polarimetric radar estimators of rain rate R and rainwater content M are examined. The accuracy of the estimators is analyzed using a gamma drop size distribution (DSD) simulation and a radar wavelength of 11 cm. The estimators that use ...

A. V. Ryzhkov; D. S. Zrni?

1995-04-01T23:59:59.000Z

458

On the Use of Radars for Operational Wind Profiling  

Science Conference Proceedings (OSTI)

The application of clear-air radars to operational wind profiling is considered. Several alternative techniques for determining atmospheric winds from radars are surveyed and, in light of the current interest in operational applications, the ...

B. B. Balsley; K. S. Gage

1982-09-01T23:59:59.000Z

459

The Effect of Radar Pulse Length on Cloud Reflectivity Statistics  

Science Conference Proceedings (OSTI)

When observing clouds with radars, there are a number of design parameters, such as transmitted power, antenna size, and wavelength, that can affect the detection threshold. In making calculations of radar thresholds, also known as minimum ...

Taneil Uttal; Robert A. Kropfli

2001-06-01T23:59:59.000Z

460

A Radar Study of the Plasma and Geometry of Lightning  

Science Conference Proceedings (OSTI)

Radar measurements and model studies are combined to investigate the plasma condition and the physical structure of lightning in thunderclouds. The lightning radar target is inferred to be an arclike plasma whose temperature exceeds 5000 K, ...

Earle R. Williams; Spiros G. Geotis; A. B. Bhattacharya

1989-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Heating Profiles Derived From Cm-wavelength Radar During TWP...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Courtney Schumacher and Kaycee Frederick Courtney...

462

Tracking system for photon-counting laser radar  

E-Print Network (OSTI)

The purpose of this thesis is to build the tracking system for a photon-counting laser radar specifically a laser radar that has the ability to perform direct and coherent detection measurement at low signal levels with ...

Chang, Joshua TsuKang

2007-01-01T23:59:59.000Z

463

Mean Vertical Motions Seen by Radar Wind Profilers  

Science Conference Proceedings (OSTI)

Radar wind profilers have been used to measure directly the vertical motion above the radar site. Mean values of vertical motions in the troposphere and lower stratosphere reported at sites in and near mountains are often several centimeters per ...

G. D. Nastrom; T. E. VanZandt

1994-08-01T23:59:59.000Z

464

A Statistical Approach to Ground Radar-Rainfall Estimation  

Science Conference Proceedings (OSTI)

This paper presents development of a statistical procedure for estimation of ensemble rainfall fields from a combination of ground radar observations and in situ rain gauge measurements. The uncertainty framework characterizes radar-rainfall ...

Alemu Tadesse; Emmanouil N. Anagnostou

2005-11-01T23:59:59.000Z

465

Estimation of Atmospheric Duct Structure Using Radar Sea Clutter  

Science Conference Proceedings (OSTI)

Retrieving atmospheric refractivity profiles from the sea surface backscattered radar clutter is known as the refractivity-from-clutter (RFC) technique. Because the relationship between refractivity and radar sea clutter is clearly nonlinear and ...

Zhao Xiaofeng; Huang Sixun

2012-09-01T23:59:59.000Z

466

The New French Operational Radar Rainfall Product. Part II: Validation  

Science Conference Proceedings (OSTI)

A new operational radar-based rainfall product has been developed at Météo-France and is currently being deployed within the French operational network. The new quantitative precipitation estimation (QPE) product is based entirely on radar data ...

P. Tabary; J. Desplats; K. Do Khac; F. Eideliman; C. Gueguen; J-C. Heinrich

2007-06-01T23:59:59.000Z

467

RADIAL-BASED NOISE POWER ESTIMATION FOR WEATHER RADARS  

Science Conference Proceedings (OSTI)

A radar antenna intercepts thermal radiation from various sources including the ground, the sun, the sky, precipitation and man-made radiators. In the radar receiver, this external radiation produces noise that constructively adds to the receiver ...

Igor R. Ivi?; Christopher Curtis; Sebastián M. Torres

468

Estimating Urban Canopy Parameters Using Synthetic Aperture Radar Data  

Science Conference Proceedings (OSTI)

This paper introduces a remote sensing–based approach to rapidly derive urban morphological characteristics using radar satellite data. The approach is based on the expectation that the magnitude of the synthetic aperture radar (SAR) backscatter ...

Indumathi Jeyachandran; Steven J. Burian; Stephen W. Stetson

2010-04-01T23:59:59.000Z

469

Operational Monitoring of Radar Differential Reflectivity Using the Sun  

Science Conference Proceedings (OSTI)

A method for the daily monitoring of the differential reflectivity bias for polarimetric weather radars is presented. Sun signals detected in polar volume data produced during operational scanning of the radar are used. This method is an ...

Iwan Holleman; Asko Huuskonen; Rashpal Gill; Pierre Tabary

2010-05-01T23:59:59.000Z

470

The Rain Profiling Algorithm Applied to Polarimetric Weather Radar  

Science Conference Proceedings (OSTI)

The algorithm developed in this paper for ground-based polarimetric radars is derived from those used for the spaceborne rain radar of TRMM (Tropical Rainfall Measurement Mission)—the so-called rain profiling algorithms. The characteristic of ...

Jacques Testud; Erwan Le Bouar; Estelle Obligis; Mustapha Ali-Mehenni

2000-03-01T23:59:59.000Z

471

Beam Multiplexing Using the Phased-Array Weather Radar  

Science Conference Proceedings (OSTI)

The recently installed S-band phased-array radar (PAR) at the National Weather Radar Testbed (NWRT) offers fast and flexible beam steering through electronic beam forming. This capability allows the implementation of a novel scanning strategy ...

Tian-You Yu; Marko B. Orescanin; Christopher D. Curtis; Dusan S. Zrni?; Douglas E. Forsyth

2007-04-01T23:59:59.000Z

472

Dual-wavelength polarimetric radar analyses of tornadic debris signatures  

Science Conference Proceedings (OSTI)

Statistical properties of tornado debris signatures (TDSs) are investigated using S- and C-band polarimetric radar data with comparisons to damage surveys and satellite imagery. Close proximity of the radars to the 10 May 2010 Moore-Oklahoma City ...

David J. Bodine; Robert D. Palmer; Guifu Zhang

473

Coastal Oceanography Applications of Digital Image Data from Marine Radar  

Science Conference Proceedings (OSTI)

A marine radar attached to a digital image capture system has been adapted for deployment from shore sites. Optimum operating parameters have been identified in relation to the resolution and sampling capabilities of both the radar and the ...

I. S. Robinson; N. P. Ward; C. P. Gommenginger; M. A. Tenorio-Gonzales

2000-05-01T23:59:59.000Z

474

Adaptive Range Oversampling to Achieve Faster Scanning on the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

This paper describes a real-time implementation of adaptive range oversampling processing on the National Weather Radar Testbed phased-array radar. It is demonstrated that, compared to conventional matched-filter processing, range oversampling can ...

Christopher D. Curtis; Sebastián M. Torres

2011-12-01T23:59:59.000Z

475

Polarization Radar Measurements in Rain at 5 and 9 GHz  

Science Conference Proceedings (OSTI)

There is increased interest in dual-polarization radar measurements at 9 and 5 GHz not only for scientific reasons but also because such radars are less expensive to build and are easier to transport than 3-GHz S-band radars. Unfortunately, ...

A. R. Jameson

1991-11-01T23:59:59.000Z

476

The New French Operational Polarimetric Radar Rainfall Rate Product  

Science Conference Proceedings (OSTI)

In 2012 the Météo France metropolitan operational radar network consists of 24 radars operating at C and S bands. In addition, a network of four X-band gap-filler radars is being deployed in the French Alps. The network combines polarimetric and ...

Jordi Figueras i Ventura; Pierre Tabary

2013-08-01T23:59:59.000Z

477

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

478

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range, high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

2013-09-01T23:59:59.000Z

479

Transcranial Doppler: A Tool for Augmented Cognition in Virtual Environments  

Science Conference Proceedings (OSTI)

In this work, we propose the use of Transcranial Doppler Monitoring (TCD) as a tool to measure brain activity during the exposure to virtual environments (VE) that can be used in Augmented Cognition (AugCog) systems. The technique is non-invasive, and ... Keywords: Augmented Cognition, Cognitive State Assessment, Neurophysiological Data, Transcranial Doppler, Virtual Reality

Beatriz Rey; Mariano Alcañiz; Valery Naranjo; Jose Tembl; Vera Parkhutik

2009-07-01T23:59:59.000Z

480

32 JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY VOLUME 29 Impact of a Vertical Vorticity Constraint in Variational Dual-Doppler Wind Analysis: Tests with Real and Simulated Supercell Data  

E-Print Network (OSTI)

One of the greatest challenges to dual-Doppler retrieval of the vertical wind is the lack of low-level divergence information available to the mass conservation constraint. This study examines the impact of a vertical vorticity equation constraint on vertical velocity retrievals when radar observations are lacking near the ground. The analysis proceeds in a three-dimensional variational data assimilation (3DVAR) framework with the anelastic form of the vertical vorticity equation imposed along with traditional data, mass conservation, and smoothness constraints. The technique is tested using emulated radial wind observations of a supercell storm simulated by the Advanced Regional Prediction System (ARPS), as well as real dual-Doppler observations of a supercell storm that occurred in Oklahoma on 8 May 2003. Special attention is given to procedures to evaluate the vorticity tendency term, including spatially variable advection correction and estimation of the intrinsic evolution. Volume scan times ranging from 5 min, typical of operational radar networks, down to 30 s, achievable by rapid-scan mobile radars, are considered. The vorticity constraint substantially improves the vertical velocity retrievals in our experiments, particularly for volume scan times smaller than 2 min. 1.

Corey K. Potvin

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radar doppler spectra" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Multifrequency and multistatic inverse synthetic aperture radar, with application to FM passive radar  

Science Conference Proceedings (OSTI)

This paper deals with the imaging of a moving target using a multifrequency and multistatic radar consisting in one receiver and several narrowband transmitters. Considering two hypotheses about the studied target, we derive two multistatic inverse synthetic ...

Guillaume Ginolhac; Françoise Schmitt; Franck Daout; Philippe Forster

2010-01-01T23:59:59.000Z

482

Effects of Raindrop-Size Distribution Variation within the Radar Scattering Volume on Radar Observables  

Science Conference Proceedings (OSTI)

Dual linear polarization weather radars measure as primary observables the mean power P?H, and P?V, corresponding to returns at horizontal and vertical polarizations, respectively. Differential reflectivity ZDR is defined as the ratio between ...

G. Scarchilli; E. Gorgucci; T. A. Seliga; K. Aydin

1990-12-01T23:59:59.000Z

483

Discover the Benefits of Radar Imaging | Open Energy Information  

Open Energy Info (EERE)

Discover the Benefits of Radar Imaging Discover the Benefits of Radar Imaging Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Discover the Benefits of Radar Imaging Author William V. Parker Published EIJ Earth Imaging Journal, 2012 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Discover the Benefits of Radar Imaging Citation William V. Parker. Discover the Benefits of Radar Imaging [Internet]. 2012. N/A. EIJ Earth Imaging Journal. [updated 2013/09/20;cited 2013/09/20]. Available from: http://eijournal.com/2012/discover-the-benefits-of-radar-imaging GEOTHERMAL ENERGYGeothermal Home Web Site: Discover the Benefits of Radar imaging Details Abstract: Unavailable Author(s): William V. Parker Published: EIJ Earth Imaging Journal, 2012

484

Transmitter passband requirements for imaging radar.  

SciTech Connect

In high-power microwave power amplifiers for radar, distortion in both amplitude and phase should generally be expected. Phase distortions can be readily equalized. Some amplitude distortions are more problematic than others. In general, especially for SAR using LFM chirps, low frequency modulations such as gain slopes can be tolerated much better than multiple cycles of ripple across the passband of the waveform.

Doerry, Armin Walter

2012-12-01T23:59:59.000Z

485

Insects Observed Using Dual-Polarization Radar  

Science Conference Proceedings (OSTI)

Two radars of different characteristics were used on a clear night in early summer to investigate the nature of the clear air echoes. It is deduced that most of the echoes on this evening were due to insects rather than atmospheric turbulence or ...

Eugene A. Mueller; Ronald P. Larkin

1985-03-01T23:59:59.000Z

486

A Typhoon Observed with the MU Radar  

Science Conference Proceedings (OSTI)

During the passage of Typhoon 8719 a 60-h continuous observation was made of the troposphere and the lower stratosphere with the MU (middle and upper atmosphere) radar. Height profiles of the wind velocity vector were measured every 2.5 min with ...

Toru Sato; Naoki Ao; Mamoru Yamamoto; Shoichiro Fukao; Toshitaka Tsuda; Susumu Kato

1991-03-01T23:59:59.000Z

487

Radar Measurement of Cooling Tower Drift  

Science Conference Proceedings (OSTI)

A method of radar measurement of drift, generated by the wet cooling towers of power plants, is proposed. The water given off by the evaporative towers consists of two kinds of droplets: the recondensation droplets—generally less than 20 ?m in ...

Henri Sauvageot

1989-09-01T23:59:59.000Z

488

Generating nonlinear FM chirp waveforms for radar.  

SciTech Connect

Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.

Doerry, Armin Walter

2006-09-01T23:59:59.000Z

489

The Vertical Resolution of the Kennedy Space Center 50-MHz Wind Profiler  

Science Conference Proceedings (OSTI)

The effective vertical resolution of the Kennedy Space Center 50-MHz Doppler radar wind profiler is determined using vertical wavenumber spectra and temporal coherence. The resolution ranges from being Nyquist limited at 300 m to as coarse as 900 ...

Francis J. Merceret

1999-09-01T23:59:59.000Z

490

Attenuation and Scattering of Millimeter Wavelength Radiation by Clouds and Precipitation  

Science Conference Proceedings (OSTI)

This article is concerned with investigations of scattering and absorption of 35, 94, 140, and 240 GHz radiation by clouds and precipitation. The computations of radar reflectivity, Doppler spectra, and absorption coefficients are performed using ...

Roger Lhermitte

1990-06-01T23:59:59.000Z

491

Scale Dependence of Radar-Rainfall Rates—An Assessment Based on Raindrop Spectra  

Science Conference Proceedings (OSTI)

Scale differences may introduce a bias when comparing, merging, or assimilating rainfall measurements because the dynamic range of values representing the underlying physical process strongly depends on the resolution of the data. The present ...

Matthias Steiner; James A. Smith

2004-12-01T23:59:59.000Z

492

An Ion Doppler Spectrometer Instrument for Ion Temperature and Flow Measurements on SSPX  

DOE Green Energy (OSTI)

A high-resolution ion Doppler spectrometer has been installed on the Sustained Spheromak Plasma Experiment to measure ion temperatures and plasma flow. The system is composed of a 1 meter focal length Czerny-Turner spectrometer with diffraction grating line density of 2400 lines/mm, which allows for first order spectra between 300 and 600 nm. A 16-channel photomultiplier tube detection assembly combined with output coupling optics provides a spectral resolution of 0.0126 nm per channel. We calculate in some detail the mapping of curved slit images onto the linear detector array elements. This is important in determining wavelength resolution and setting the optimum vertical extent of the slit. Also, because of the small wavelength window of the IDS, a miniature fiber optic survey spectrometer sensitive to a wavelength range 200 to 1100 nm and having resolution 0.2 nm, is used to obtain a time-integrated spectrum for each shot to verify specific impurity line radiation. Several measurements validate the systems operation. Doppler broadening of C III 464.72 nm line in the plasma shows time-resolved ion temperatures up to 250 eV for hydrogen discharges, which is consistent with neutral particle energy analyzer measurements. Flow measurements show a sub-Alfvenic plasma flow ranging from 5 to 45 km/s for helium discharges.

King, J D; McLean, H S; Wood, R D; Romero-Talamas, C A; Moller, J M; Morse, E C

2008-05-19T23:59:59.000Z

493

Scale Dependence of Radar Rainfall Uncertainty: Initial Evaluation of NEXRAD’s New Super-Resolution Data for Hydrologic Applications  

Science Conference Proceedings (OSTI)

This study explores the scale effects of radar rainfall accumulation fields generated using the new super-resolution level II radar reflectivity data acquired by the Next Generation Weather Radar (NEXRAD) network of the Weather Surveillance Radar-...

Bong-Chul Seo; Witold F. Krajewski

2010-10-01T23:59:59.000Z

494

Vertical Velocity and Buoyancy Characteristics of Coherent Echo Plumes in the Convective Boundary Layer, Detected by a Profiling Airborne Radar  

Science Conference Proceedings (OSTI)

Aircraft and airborne millimeter-wave radar observations are used to interpret the dynamics of radar echoes and radar-inferred updrafts within the well-developed, weakly sheared continental convective boundary layer. Vertically pointing radar ...

Qun Miao; Bart Geerts; Margaret LeMone

2006-06-01T23:59:59.000Z

495

Effects of Wind Turbulence on Coherent Doppler Lidar Performance  

Science Conference Proceedings (OSTI)

The effects of wind turbulence on pulsed coherent Doppler lidar performance are investigated theoretically and with computer simulations. The performance of velocity estimators is determined for the case of a single realization of a wind field ...

Rod Frehlich

1997-02-01T23:59:59.000Z

496

Modeling Pulse-to-Pulse Coherent Doppler Sonar  

Science Conference Proceedings (OSTI)

Coherent Doppler sonar provides a powerful tool for probing boundary layer flows under field and laboratory conditions. However, velocity profiling applications of this technique are complicated by characteristic velocity and range ambiguities. ...

L. Zedel

2008-10-01T23:59:59.000Z

497

Receiver and Analog Homodyning Effects on Incoherent Doppler Velocity Estimates  

Science Conference Proceedings (OSTI)

Oceanic incoherent Doppler sonar systems (current profiling systems) employing intrapulse covariance calculations and related first spectral-moment approximations to calculate volumetric fluid motion are sensitive to design tolerance of the sonar ...

D. Scott Hansen

1985-12-01T23:59:59.000Z

498

Turbulence Kinetic Energy Budget Profiles Derived from Doppler Sodar Measurements  

Science Conference Proceedings (OSTI)

Doppler sodar wind measurements made in light wind conditions in September 1979 near a power plant in Turbigo, Italy, are used to derive terms in the turbulence kinetic energy (TKE) budget. Measurements on five days are grouped into two classes: ...

Gary K. Greenhut; Giangiuseppe Mastrantonio

1989-02-01T23:59:59.000Z

499

Multifrequency Decoding of a Phased Array Doppler Sodar  

Science Conference Proceedings (OSTI)

Doppler sodar is being used for studying the lower part of atmospheric boundary layer (ABL) and wind profiling. To obtain maximum altitude coverage multifrequency transmission has been used along with more transmitted power. In this article, the ...

I. Srinivasa Rao; V. K. Anandan; M. Shravan Kumar

2009-04-01T23:59:59.000Z

500

Asymptotic Properties of an Autocorrelation Coefficient for Coherent Doppler Sonar  

Science Conference Proceedings (OSTI)

A new formula is derived for the asymptotic form of the magnitude of an autocorrelation coefficient for coherent Doppler sonar. The autocorrelation magnitude is shown to be a biased estimator in the limit of infinite ensemble length. Numerical ...

Jeremy Dillon; Len Zedel; Alex E. Hay

2011-07-01T23:59:59.000Z