高斯粗糙表面电磁散射的曲率修正双尺度法

Two-Scale Method of Electromagnetic Scattering from the Gauss Rough Surfaces Based on the Curvature Modification

在传统双尺度法分析粗糙表面电磁散射特性的基础上,通过对大尺度切平面的曲率修正,给出了小入射角时改进双尺度法的计算模型。采用传统微扰法和基于圆柱曲面修正的微扰法,计算了实际粗糙面掠入射时的后向散射系数,并与有关测量值进行了比较。结果表明,在中、小入射角及掠入射条件下,基于曲率修正双尺度法的计算结果与实际值均较为相近,证明该方法有效。

On the basis of analyzing the classical two-scale method, the computation model of the improved two-scale method at low angles was given by the curvature modification of large-scale flat facets in this paper. Comparison of a set of measured data to numerical computations of the backscattering coefficients for actual natural rough surface by the classical and new perturbation methods were given. The results showed that the new two-scale method was similar to the real data under small, moderate and low grazing incidence. The new method was valid.