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Simulated images of urban areas using an extended GTD ray-tracing model of the synthetic aperture radar

The exact solution to the synthetic aperture radar (SAR) scattering problem from an urban scene, with its collection of object-length scales, 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 large to be realistic. The geometrical theory of diffraction (GTD) 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. This gives an accurate result with a practical amount of computation. However, the range of problems to which GTD can be applied is limited by the availability of the solutions to the canonical problems from which the diffraction coefficients of GTD are calculated. In this paper a physical optics version of GTD was used in conjunction with a ray-tracing approach to simulate the SAR scattering from a simulated urban scene.