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Title: Moving receive beam method and apparatus for synthetic aperture radar

Abstract

A method and apparatus for improving the performance of Synthetic Aperture Radar (SAR) systems by reducing the effect of "edge losses" associated with nonuniform receiver antenna gain. By moving the receiver antenna pattern in synchrony with the apparent motion of the transmitted pulse along the ground, the maximum available receiver antenna gain can be used at all times. Also, the receiver antenna gain for range-ambiguous return signals may be reduced, in some cases, by a large factor. The beam motion can be implemented by real-time adjustment of phase shifters in an electronically-steered phased-array antenna or by electronic switching of feed horns in a reflector antenna system.

Inventors:
 [1]
  1. San Ramon, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
873501
Patent Number(s):
6175326
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
moving; receive; beam; method; apparatus; synthetic; aperture; radar; improving; performance; systems; reducing; effect; edge; losses; associated; nonuniform; receiver; antenna; pattern; synchrony; apparent; motion; transmitted; pulse; ground; maximum; available; times; range-ambiguous; return; signals; reduced; factor; implemented; real-time; adjustment; phase; shifters; electronically-steered; phased-array; electronic; switching; feed; horns; reflector; return signal; aperture radar; phase shift; phase shifter; synthetic aperture; transmitted pulse; phased-array antenna; phase shifters; receiver antenna; electronic switch; beam method; /342/

Citation Formats

Kare, Jordin T. Moving receive beam method and apparatus for synthetic aperture radar. United States: N. p., 2001. Web.
Kare, Jordin T. Moving receive beam method and apparatus for synthetic aperture radar. United States.
Kare, Jordin T. Mon . "Moving receive beam method and apparatus for synthetic aperture radar". United States. https://www.osti.gov/servlets/purl/873501.
@article{osti_873501,
title = {Moving receive beam method and apparatus for synthetic aperture radar},
author = {Kare, Jordin T},
abstractNote = {A method and apparatus for improving the performance of Synthetic Aperture Radar (SAR) systems by reducing the effect of "edge losses" associated with nonuniform receiver antenna gain. By moving the receiver antenna pattern in synchrony with the apparent motion of the transmitted pulse along the ground, the maximum available receiver antenna gain can be used at all times. Also, the receiver antenna gain for range-ambiguous return signals may be reduced, in some cases, by a large factor. The beam motion can be implemented by real-time adjustment of phase shifters in an electronically-steered phased-array antenna or by electronic switching of feed horns in a reflector antenna system.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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