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A useful approximation for the flat surface impulse responseThe flat surface impulse response (FSIR) is a very useful quantity in computing the mean return power for near-nadir-oriented short-pulse radar altimeters. However, for very small antenna beamwidths and relatively large pointing angles, previous analytical descriptions become very difficult to compute accurately. An asymptotic approximation is developed to overcome these computational problems. Since accuracy is of key importance, a condition is developed under which this solution is within 2 percent of the exact answer. The asymptotic solution is shown to be in functional agreement with a conventional clutter power result and gives a 1.25-dB correction to this formula to account properly for the antenna-pattern variation over the illuminated area.
Document ID
19890055394
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Brown, Gary S.
(Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 37
ISSN: 0018-926X
Subject Category
Communications And Radar
Accession Number
89A42765
Funding Number(s)
CONTRACT_GRANT: NAG5-636
Distribution Limits
Public
Copyright
Other

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