说明：  本文利用Ping-Liang Rui，Ru-Shan Chen提出的一种基于多层快速多极子（MLFMA）谱域两步预处理方法，来求解在单站RCS计算时产生的有多个右边项的大型线性方程组。C 语言实现。
(In this paper, Ping-Liang Rui, Ru-Shan Chen proposed based on multilevel fast multipole (MLFMA) spectral-domain two-step pretreatment method to solve the monostatic RCS calculations have produced a large number on the right items linear Equations)