电各向异性色散介质电磁散射时域有限差分分析的半解析递推卷积方法

利用坐标系转换矩阵给出实验室系中磁化等离子体介质的频域极化率张量, 采用部分分式展开方法通过傅里叶逆变换得到极化率张量的时域指数函数形式, 应用数字信号处理中的半解析递归卷积算法, 给出适用于处理任意外磁场方向情形下磁化等离子体目标电磁散射的半解析递归卷积-时域有限差分计算方法. 计算了磁化等离子体球的同极化和交叉极化后向雷达散射截面, 结果表明了算法的正确有效性.关键词：半解析递归卷积磁化等离子体电磁散射时域有限差分方法

Semi-analytical recursive convolution algorithm in the finite-difference time domain analysis of anisotropic dispersive medium

The polarizability tensor of magnetized plasma in frequency domain in laboratory coordinate system is gained by using the transfer matrix between the principal and the laboratory system, and then its exponential function form in time domain is derived by inverse Fourier transform. Combined with the semi-analytical recursive convolution (SARC) algorithm in digital signal process techniques, the SARC-finite-difference time-domain method applied to magnetized plasma subjected to an arbitrary direction of external dc magnetic field is derived. The co-polarized and cross-polarized backward radar scattering cross-section for a magnetized plasma sphere are obtained by the presented algorithm. The computed results indicate the correctness and feasibility of the method.