应用DWT-Chebyshev方法计算宽带雷达散射截面

在目标宽带电磁散射特性分析中引入切比雪夫逼近理论,并将离散小波变换技术应用于矩量法,通过快速求解给定频带内的切比雪夫节点和节点处目标的表面电流分布,获得了频带内任意频率点的电流分布,从而实现了目标宽带雷达散射截面的快速计算。将计算结果与矩量法逐点计算的结果进行了比较,结果表明:本文方法在提高计算效率和节约存储空间方面具有明显优势。

Fast computation of wide-band radar cross section using DWT-Chebyshev method

Chebyshev approximation theory was applied to the scattering analysis of arbitrary shaped perfect electric conductors over a wide frequency band.The nodes of Chebyshev within a given frequency range were found firstly,and the surface electric currents at these nodes were computed by the method of moments combined with discrete wavelet transform (DWT). In the presented method,the surface current on the perfect electric conductor is expanded in a rational function via the Chebyshev approximation.Using this function,the electric current distribution can be obtained at any frequency within the given frequency range,which is used to compute the scattered fields and the wide-band radar cross section (RCS).The numerical results presented in this paper were compared with the results obtained by the method of moments at each frequency.It was shown that the computational efficiency was improved greatly and the memory required was reduced drastically.