二维电大尺寸目标电磁散射特性的特征基函数法分析

特征基函数法是近几年提出的一种求解电磁散射问题的有效方法,该方法基于分块和高层基函数的概念,通过对子域大小的选择来控制生成矩阵的维数,是一种新颖的矩阵降阶方法.应用特征基函数并结合区域分解法对二维电大尺寸导体柱和介质柱的雷达散射截面进行了计算,且通过扩展子域边界的办法来消除直接划分子域所带来的电流不连续性问题.结果与传统矩量法的计算结果吻合良好,而计算效率得到较大的提高.

Analysis of electromagnetic scattering characteristics from two dimentional electrically large objects using characteristic basis function method

Characteristic basis function method(CBFM) was a novel approach for the efficient solution of electromagnetic scattering problems.Based on the conceptions of grouping and high level basis function,the size of the sub-block can be chosen to control the size of the matrix,thus it was a new approach to reduce the dimension of the matrix.CBFM combined with the method of domain decomposition was used to calculate the radar cross sections from two dimensional electrically large conducting cylinder and dielectric cylinder,in which the problem of current discontinuity resulting from the direct division to the sub-block be resolved by extending the sub-block.It was shown that the numerical results presented in this paper were in good agreement with that achieved by the traditional method of moments,while the computational efficiency was improved considerably.