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Proceedings Paper

Xpatch prediction improvements to support multiple ATR applications
Author(s): Dennis J. Andersh; Shung Wu Lee; John T. Moore; Douglas P. Sullivan; Jeff A. Hughes; Hao Ling
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Paper Abstract

This paper describes an electromagnetic computer prediction code for generating radar cross section (RCS), time-domain signature sand synthetic aperture radar (SAR) images of realistic 3D vehicles. The vehicle, typically an airplane or a ground vehicle, is represented by a computer-aided design (CAD) file with triangular facets, IGES 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 computers the first- bounce physical optics (PO) plus the physical theory of diffraction (PTD) contributions. Xpatch calculates the multi-bounce ray contributions by using geometric optics and PO for complex vehicles with materials. It has been found that the multi-bounce calculations, the radar return in typically 10 to 15 dB too low. Examples of predicted range profiles, SAR, imagery, and RCS for several different geometries are compared with measured data to demonstrate the quality of the predictions. Recent enhancements to Xpatch include improvements for millimeter wave applications and hybridization with finite element method for small geometric features and augmentation of additional IGES entities to support trimmed and untrimmed surfaces.

Paper Details

Date Published: 26 August 1998
PDF: 12 pages
Proc. SPIE 3395, Radar Sensor Technology III, (26 August 1998); doi: 10.1117/12.319441
Show Author Affiliations
Dennis J. Andersh, DEMACO, Inc. (United States)
Shung Wu Lee, DEMACO, Inc. (United States)
John T. Moore, DEMACO, Inc. (United States)
Douglas P. Sullivan, DEMACO, Inc. (United States)
Jeff A. Hughes, Air Force Research Lab. (United States)
Hao Ling, Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 3395:
Radar Sensor Technology III
Robert Trebits; James L. Kurtz, Editor(s)

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