Direct Numerical Simulation of Electromagnetic Rough Surface and Sea Scattering by an Improved Banded Matrix Iterative Method
JOHNS HOPKINS APL TECHNICAL DIGEST(1997)
摘要
A new method for direct numerical simulation of electromagnetic or acoustic wave scattering by randomly rough surfaces is presented. The numerical scheme is derived from the well-known method of moments, in which the surface current integral equation is discretized to form a large matrix inverse problem. The simulations use recent advances in the efficient solution of the inverse problem that exploit the special structure of the moment matrix. By applying specialized numerical techniques, the computing time and memory requirements are reduced, thereby making simulation practical for desktop workstations. As an example, radar sea-scattering simulations are shown that illustrate the diffuse nature of the radar/ocean surface interaction as well as the strong dependence on wind speed and incidence angle. These calculations are particularly relevant to APL programs involving imaging radars and over-water low-elevation-angle target detection and tracking.
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关键词
method of moments,Monte Carlo methods,radar sea scattering,rough surface scattering
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