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21 December 1994 Application of an extended GTD model to synthetic aperture radar simulation
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An urban scene has very complex variety of length scales ranging from much larger to much smaller tan the wavelength of the radiation emitted by a Synthetic Aperture Radar (SAR). The exact solution to this scattering problem requires the solution of Maxwell's equations for the combination of source and scattering objects present in the scene, which for any reasonable size target area is computationally too intensive to be realistic. Hence while a 'numerically exact' solution at present is not possible, some form of appropriate modeling scheme is used as is usual in electromagnetic problems. The geometrical theory of diffraction (GAD) gives an accurate result with a practical amount of computation. This theory is based on the fact that the most important contributions towards the scattered field come from an area in the neighborhood of some critical points on the scattering surface. For a planar surface, three critical points may be regarded: specular, edge-diffraction and corner-diffraction points. A physical optics version of GAD was taken with the approximate diffraction coefficients derived using physical optics approximations to canonical problems. In this paper, the new model is described in addition to an overview of ray-tracing procedure adopted and its resultant images.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shahram Tajbakhsh, Min-Joon Kim, H. M. Berenyi, and Ronald E. Burge "Application of an extended GTD model to synthetic aperture radar simulation", Proc. SPIE 2316, SAR Data Processing for Remote Sensing, (21 December 1994);

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