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本文构造了Mur条件的频域有限差分近似。结合推导的非均匀、各向异性媒质中有限差分方程,可以有效、方便地计算电大尺寸复杂媒质体的电磁散射问题。运用稀疏矩阵压缩存贮技术和迭代求解算法,大大减少了所占用的计算机内存,与矩量法相比计算时间也大为减少。文中计算了几种媒质情况上圆柱和方柱的雷达散射截面,并与已有数据作了比较,结果一致性较好。
In this paper, the frequency domain finite difference approximation of Mur condition is constructed. Combined with the derived finite difference equations in non-uniform and anisotropic media, the electromagnetic scattering problem of electrically large complex media can be computed efficiently and conveniently. The use of sparse matrix compression storage and iterative solution algorithm, greatly reducing the occupied computer memory, compared with the moment method also greatly reduces the computational time. In this paper, the radar cross section of the cylinder and the square column in several media conditions is calculated and compared with the existing data. The result is consistent.