Abstract: A fast algorithm—fast multipole method and conjugate gradient method (FMM-CG)is developed to analyze electromagnetic scattering by electrically large three-dimensional multi-conducting bodies in this paper. Two methods are also presented to accelerates the solution of RCS: surface electric current approximation of physical optics (PO) and phase-corrected succession iterative method. This algorithm obviously reduces the computing complexity and memory requirement. It is fast and accurate, just fit for analysis of interactions between electrically large multi-conducting bodies. Finally, the accuracy and efficiency of the method are verified by 3-D numerical examples.

Key words: electromagnetic scattering, fast multipole method, RCS

摘要： 用快速多极子算法(FMM)和共轭梯度法(CG)求解三维电大尺寸复杂群目标的电磁散射特性。对单站雷达散射截面(RCS)的预估，更采用了物理光学电流近似和相位修正的继承迭代法两项措施进一步加快了求解过程。该方法具有节省内存，计算量小，迭代速度快且精确度高的特点，特别适于准确分析多个电大尺寸目标间的相互影响。用三维计算实例验证了该方法在解决电大尺寸复杂群目标电磁散射分析方面的有效性和优越性。

关键词: 电磁散射, 快速多极子算法, 雷达散射截面(RCS)