Abstract
A hybrid method, combining analytic Kirchhoff approximation (KA) and numerical method of moments (MoMs), is developed to solve the two-dimensional (2D) scattering problem of multiple targets with arbitrary cross section above a Gaussian conducting rough surface under TE-polarized tapered incident. Considering the targets as the MoM region and the rough surface as the KA region, the induced current on the rough surface is obtained through the KA method, leaving only unknowns on the target region. Furthermore, to speed up computation of the scattering contribution from the rough surface to the target, a small section of rough surface is only needed to take account the scattering contribution due to the specular reflection of the rough surface. Making use of Monte Carlo realization, bistatic scattering from two cylindrical targets above a PEC rough surface is well simulated to test validity and efficiency of the proposed method. Numerical results from the hybrid method have good agreements with those from the conventional method of moments. However, the computational time and the memory requirements have been greatly reduced.
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