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Title: Antenna phase center locations in tapered aperture subarrays.


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 2016 held April 17-21, 2016 in Baltimore, MD.
Country of Publication:
United States

Citation Formats

Doerry, Armin W., and Bickel, Douglas L. Antenna phase center locations in tapered aperture subarrays.. United States: N. p., 2016. Web.
Doerry, Armin W., & Bickel, Douglas L. Antenna phase center locations in tapered aperture subarrays.. United States.
Doerry, Armin W., and Bickel, Douglas L. 2016. "Antenna phase center locations in tapered aperture subarrays.". United States. doi:.
title = {Antenna phase center locations in tapered aperture subarrays.},
author = {Doerry, Armin W. and Bickel, Douglas L.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 1

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  • Antenna apertures that are tapered for sidelobe control can also be parsed into subapertures for Direction of Arrival (DOA) measurements. However, the aperture tapering complicates phase center location for the subapertures, knowledge of which is critical for proper DOA calculation. In addition, tapering affects subaperture gains, making gain dependent on subaperture position. Techniques are presented to calculate subaperture phase center locations, and algorithms are given for equalizing subapertures’ gains. Sidelobe characteristics and mitigation are also discussed.
  • Basic characteristics of an aperture antenna attached to a cutoff cavity for ICRF plasma heating are investigated. The analysis is performed for antennas radiating into semi-infinite free space rather than a magnetoplasma. Good agreement between theory and experiment is observed, indicating the validity of the analysis.
  • We have made aperture synthesis observations of HCN J = 1--0 emission and absorption in the central 5 pc of the Galaxy with 2'' spatial and 4 km/s spectral resolution. The resulting maps show a clumpy ring of molecular gas which surrounds the ionized central 2 pc of the Galaxy. The molecular gas is dynamically coupled to the ionized gas in the central cavity; the western arc of the radio continuum appears to be the inner surface of the molecular ring ionized there by UV radiation from the center, the northern arm may be ionized gas falling from the ringmore » into the Galactic center. The molecular ring is warped with an inclination which changes from 50 to 75 degrees. The velocity field of the molecular gas in the inner 5 pc is that of strongly perturbed rotation. No overall radial motion of the ring greater than 20 km s/sup -1/ is apparent. There is a large local velocity dispersion (FWHM = 40--50 km s/sup -1/ in a 4'' beam) which indicates that the present features have a short dynamic lifetime (<10/sup 5/ y). The disk's turbulence may be maintained by dissipation of rotational energy and by energy input from the center. The neutral gas ring may be an accretion disk from which interstellar material falls into the central pc of the Galaxy.« less
  • In planning and designing emergency facilities, cost must be balanced against desired performance and likelihood of need. This balance is difficult to achieve for emergency facilities whose capabilities are not clearly defined in US Nuclear Regulatory Commission (NRC) regulations and regulatory guidance. In the case of a joint public information enter (JPIC), for example, a wide range of solutions may meet NRC requirements, ranging from custom-built, extensively equipped facilities to converted garages. As a matter of corporate policy, Illinois Power (IP) Company has fully supported the objective of complete, accurate, and timely notification and information of the public in themore » event of an emergency at its Clinton Power Station. It was important to establish this policy explicitly before any decisions were made relative to personnel, facilities, or equipment. An additional objective was to accomplish this using facilities completely under the control of the utility. The performance of the Clinton JPIC and of the emergency public information organization in general has received praise from exercise evaluators. Significant logistical problems associated with operating a JPIC remotely from the site and the EOF have been minimized at reasonable cost. Most importantly, IP personnel responsible for emergency public information have high confidence that the system will work for a real emergency as well as it does for exercises.« less
  • A transmission line model for the TFTR ICRF antenna is presented. The antenna is considered as being composed of mutually coupled transmission lines. Expressions for the input impedance of such a structure are given. Details of the considerations in setting up the antenna feed structure are presented. The requirement of dual feed drive coupled with the desire for phase and amplitude control place restrictions on the operating circuit.