摘要
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。
Novel finite-difference approximations of Mur's conditions are presented in frequency-domain. Combined with the FD-FD equations deduced, the new conditions are convenient and effective to solve EM problems of inhomogeneous anisotropic media. By use of the compressed storage sparse matrix technique and iteration algorithm, the computer memories demanded are decreased and the CPU time is shortened compared with those obtained by moment method (MM). RCS of cylinders and rectangular posts are given with several kinds of media. The results of cylinder are in good agreement with those of MM.
