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Record 8 of 4182
Shooting and bouncing rays - Calculating the RCS of an arbitrarily shaped cavity
External Online Source: doi:10.1109/8.18706
Author and Affiliation:
Ling, Hao(Texas, University, Austin, United States)
Chou, Ri-Chee(Ohio State University, Columbus, United States)
Lee, Shung-Wu(Illinois, University, Urbana, United States)
Abstract: A 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.
Publication Date: Feb 01, 1989
Document ID:
19890046871
(Acquired Nov 28, 1995)
Accession Number: 89A34242
Subject Category: COMMUNICATIONS AND RADAR
Document Type: Journal Article
Publication Information: IEEE Transactions on Antennas and Propagation; p. 194-205; (ISSN 0018-926X); 37
Publisher Information: United States
Contract/Grant/Task Num: NAG3-475
Financial Sponsor: NASA; United States
Organization Source: Texas Univ.; Austin, TX, United States
Ohio State Univ.; Columbus, OH, United States
Illinois Univ.; Urbana, IL, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CAVITY RESONATORS; ELECTROMAGNETIC PULSES; GEOMETRICAL OPTICS; PHYSICAL OPTICS; RADAR CROSS SECTIONS; RAY TRACING; APERTURES; BACKSCATTERING; CAVITIES; CIRCULAR CYLINDERS; FOURIER TRANSFORMATION; SNELLS LAW
Imprint And Other Notes: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. 37, Feb. 1989, p. 194-205. Research supported by the University of Texas and Cray Research, Inc.
Miscellaneous Notes: Research supported by the University of Texas and Cray Research, Inc
Availability Source: Other Sources
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