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Title: Using coherence as a quality measure for complex radar image compression.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
Personal time
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the SPIE Defense & Security Symposium 2017 held April 9-13, 2017 in Anaheim, CA.
Country of Publication:
United States

Citation Formats

Doerry, Armin W., and Bickel, Douglas L.. Using coherence as a quality measure for complex radar image compression.. United States: N. p., 2017. Web.
Doerry, Armin W., & Bickel, Douglas L.. Using coherence as a quality measure for complex radar image compression.. United States.
Doerry, Armin W., and Bickel, Douglas L.. Wed . "Using coherence as a quality measure for complex radar image compression.". United States. doi:.
title = {Using coherence as a quality measure for complex radar image compression.},
author = {Doerry, Armin W. and Bickel, Douglas L.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}

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  • While many synthetic aperture radar (SAR) applications use only detected imagery, dramatic improvements in resolution and employment of algorithms requiring complex-valued SAR imagery suggest the need for compression of complex data. Here, we investigate the benefits of using complex- valued wavelets on complex SAR imagery in the embedded zerotree wavelet compression algorithm, compared to using real-valued wavelets applied separately to the real and imaginary components. This compression is applied at low ratios (4:1-12:1) for high fidelity output. The complex spatial correlation metric is used to numerically evaluate quality. Numerical results are tabulated and original and decompressed imagery are presented asmore » well as correlation maps to allow visual comparisons.« less
  • The use of the NOEL (No Effect Level) to determine safe concentrations of toxic substances has recently been questioned since the NOEL is generally estimated using hypothesis testing procedures, and is significantly affected by several test variables. An alternative approach involved the selection of a benchmark effect level and a statistical procedure to estimate the effluent concentration which would result in a fixed reduction of 10% in the growth of the fathead minnow, Pimephales promelas, or the reproduction of the cladoceran, Ceriodaphnia. Tests conducted on ambient samples and samples from 50 industrial and municipal effluents discharging to the tidal Delawaremore » River were utilized to derive EC10 and NOEL values for each test. 72% of the ratios of the EC10 to NOEL values were less than or equal to 1.0 indicating that the NOEL determined using hypothesis testing procedures frequently exceeded a concentration which produces a 10% reduction in the response of test organisms compared to control organisms. A water quality criterion for chronic toxicity was developed using these results by calculating the goth percentile of the cumulative frequency distribution of the ratios. This procedure is similar to the one used by the US Environmental Protection Agency to develop the acute toxicity criterion of 0.3 Toxic Units. A 90th percentile value of 0.47 was calculated for this data set. A water quality criterion of 0.5 Toxic Units for chronic toxicity to aquatic life in the tidal Delaware River would therefore represent a more consistent and acceptable level of chronic toxicity based upon a fixed and minimal impairment in growth and reproduction.« less
  • Abstract not provided.
  • Pulse compression radar reflectometry is used to obtain electron density profile in plasma with parasitic reflections in this article. The pulse compression radar relies on the relation between the temporal width of a pulse and the frequency bandwidth of this pulse: {delta}t{proportional_to}1/{delta}f. So a set of sweep-frequency microwaves within a bandwidth {delta}f can be introduced sequentially into the plasma to obtain the same information as the one obtained by a real pulse. By applying a Fourier transform to the data of reflectivity array in the frequency domain, the temporal response in the time domain is obtained. The limitation of themore » parasitic reflections on measurement can be eliminated from the temporal response by the method of time gate. This is a prominent advantage when this method is compared to the traditional reflectometry. For this method, an appropriate compromise between the spatial resolution and the electron density resolution is important. Experimental results show that the profile obtained from pulse compression radar reflectometry is similar to that from a double Langmuir probe.« less
  • Useful products generated from interferometric synthetic aperture radar (IFSAR) complex data include height measurement, coherent change detection, and classification. The IFSAR coherence is a spatial measure of complex correlation between two collects, a product of IFSAR signal processing. A tacit assumption in such IFSAR signal processing is that one height target exists in each range-Doppler cell. This paper presents simulations of IFSAR coherence if two targets with different heights exist in a given range-Doppler cell, a condition in IFSAR collections produced by layover. It also includes airborne IFSAR data confirming the simulation results. The paper concludes by exploring the implicationsmore » of the results on IFSAR classification and height measurements.« less