基于最小二乘拟合和特征基函数法的目标宽带RCS快速计算

摘要

提出一种快速分析目标宽带雷达散射截面的方法,该方法将最小二乘拟合与特征基函数法相结合,通过计算选定的若干频率点的表面电流便可快速求解出整个频带内的表面电流.具体过程为利用特征基函数法求解选定频率点目标表面电流,进而利用最小二乘拟合实现表面电流和雷达散射截面的快速计算.数值计算结果表明:在不影响精度的前提下,该方法可大大提高计算效率、减少内存需求.%A new method for fast calculation of wide-band radar cross section(RCS) is presented which is based on the least square fitting (LSF) technique and characteristic basis function method (CBFM).The surface current of the whole frequency band can be obtained quickly through the surface current of some selected frequency points in this new method.The detailed process can be implemented as follow.Firstly,the CBFM is used to calculate the current at selected frequency point,respectively.Then,the LSF technique will be employed for the fast solver of wide-band surface current and RCS.Numerical results show that the computational efficiency is improved significantly and the memory cost is decreased by using the method presented in this paper without sacrificing much accuracy.