表面具有分形结构金属劈边缘绕射系数的提取

Derivation of Numerical Diffraction Coefficient of the Wedge Characterized by Fractal Surfaces

本文提出了一种计算数值绕射系数的有效方法，并将之用于提取表面具有分形结构金属劈的绕射系数。利用时域有限差分（ＦＤＴＤ）法提供的散射场，根据几何绕射理论（ＧＴＤ）建立含有绕射系数未知量的方程组，通过联立方程组的求解，得到散射体边缘的数值绕射系数。具体计算例子表明，该算法是有效的。

The numerical method for derivation of diffraction coefficients of wedge characterized by fractal surfaces is described.We use the Finite-difference Time-domain (FDTD) method to compute the scattered field of an object possessing several scattering centers.The numerical diffraction coefficient of the scattering center under investigation is then obtained by solving simultaneous equations established via GTD consideration. The examples show the feasibility of the present method.