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Shooting and bouncing rays - Calculating the RCS of an arbitrarily shaped cavityA ray-shooting approach is presented for calculating the interior radar cross section (RCS) from a partially open cavity. In the problem considered, a dense grid of rays is launched into the cavity through the opening. The rays bounce from the cavity walls based on the laws of geometrical optics and eventually exit the cavity via the aperture. The ray-bouncing method is based on tracking a large number of rays launched into the cavity through the opening and determining the geometrical optics field associated with each ray by taking into consideration (1) the geometrical divergence factor, (2) polarization, and (3) material loading of the cavity walls. A physical optics scheme is then applied to compute the backscattered field from the exit rays. This method is so simple in concept that there is virtually no restriction on the shape or material loading of the cavity. Numerical results obtained by this method are compared with those for the modal analysis for a circular cylinder terminated by a PEC plate. RCS results for an S-bend circular cylinder generated on the Cray X-MP supercomputer show significant RCS reduction. Some of the limitations and possible extensions of this technique are discussed.
Document ID
19890046871
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ling, Hao
(Texas, University Austin, United States)
Chou, Ri-Chee
(Ohio State University Columbus, United States)
Lee, Shung-Wu
(Illinois, University Urbana, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1989
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 37
ISSN: 0018-926X
Subject Category
Communications And Radar
Accession Number
89A34242
Funding Number(s)
CONTRACT_GRANT: NAG3-475
Distribution Limits
Public
Copyright
Other

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