三维介质目标电磁散射的一种计算方法

The application of a mixed technique to 3D dielectric objects

采用矩量法 -共轭梯度 -快速富立叶变换 (MOM- CGM- FFT)的混合技术来研究三维均匀介质和非均匀介质目标的散射问题。该方法是以等效电流作为未知函数建立积分方程 ,用 MOM将之转化为线性代数方程组 ,应用 CGM- FFT进行求解。由于在计算中采用了 CGM- FFT技术 ,降低了所需计算机内存和 CPU时间 ,可以有效地处理电大尺寸三维目标的散射。所计算出的数据和解析结果相比较 ,吻合较好。结果证明 ,该方法适应性广 ,是一种求解三维电磁散射问题的简单途径。

The electromagnetic scattering of three dimensional (3D) dielectric bodies is investigated by using a mixed technique of the method of moment (MOM), conjugate gradient method (CGM) and fast Fourier transform (FFT). Pulse basis functions and a Dirac δ function are used for expansion and testing purposes to discretize the electric field integral equation(EFIE). CGM and FFT technique are used for reducing storage and CPU time, therefore electrically large bodies can be handled effectively. The numerical results are validated by comparing the radar cross section (RCS) of dielectric spheres with those obtained using analytical method or results given in other papers.