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Proceedings Paper

XPATCH: a high-frequency electromagnetic scattering prediction code using shooting and bouncing rays
Author(s): Michael Hazlett; Dennis J. Andersh; Shung Wu Lee; Hao Ling; C. L. Yu
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Paper Abstract

This paper describes an electromagnetic computer prediction code for generating radar cross section (RCS), time domain signatures, and synthetic aperture radar (SAR) images of realistic 3-D vehicles. The vehicle, typically an airplane or a ground vehicle, is represented by a computer-aided design (CAD) file with triangular facets, curved surfaces, or solid geometries. The computer code, XPATCH, based on the shooting and bouncing ray technique, is used to calculate the polarimetric radar return from the vehicles represented by these different CAD files. XPATCH computes the first-bounce physical optics plus the physical theory of diffraction contributions and the multi-bounce ray contributions for complex vehicles with materials. It has been found that the multi-bounce contributions are crucial for many aspect angles of all classes of vehicles. Without the multi-bounce calculations, the radar return is typically 10 to 15 dB too low. Examples of predicted range profiles, SAR imagery, and radar cross sections (RCS) for several different geometries are compared with measured data to demonstrate the quality of the predictions. The comparisons are from the UHF through the Ka frequency ranges. Recent enhancements to XPATCH for MMW applications and target Doppler predictions are also presented.

Paper Details

Date Published: 2 June 1995
PDF: 10 pages
Proc. SPIE 2469, Targets and Backgrounds: Characterization and Representation, (2 June 1995); doi: 10.1117/12.210627
Show Author Affiliations
Michael Hazlett, Air Force Wright Lab. (United States)
Dennis J. Andersh, Air Force Wright Lab. (United States)
Shung Wu Lee, Univ. of Illinois/Urbana-Champaign (United States)
Hao Ling, Univ. Texas/Austin (United States)
C. L. Yu, Naval Air Warfare Ctr. (United States)


Published in SPIE Proceedings Vol. 2469:
Targets and Backgrounds: Characterization and Representation
Wendell R. Watkins; Dieter Clement, Editor(s)

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