分段Padé逼近法用于预测二维介质柱的单站RCS方向图  

PADE APPROXIMATION IN SEGMENTS APPLIED TO PREDICT MONOSTATIC RCS PATTERN OF A 2D DIELECTRIC OBJECT

作　　者：周后型[1] 洪伟[1] 许锋[1] 

机构地区：[1]东南大学计算电磁学研究中心,南京210096

出　　处：《电子与信息学报》2003年第7期969-974,共6页Journal of Electronics & Information Technology

基　　金：国家杰出青年基金;项目批准号:69625102

摘　　要：矩量法与分段Pade逼近法结合用于预测任意形状截面二维介质柱的单站RCS方向图。该方法采用以总电场为未知函数的微积分方程。在矩量法过程中,用共轭梯度法和快速傅里叶变换(CG-FFT)的组合算法求解线性方程组,以便降低存储量和加快迭代速度。分段Pade逼近法用于加速获取单站RCS方向图。这里为分段Pade逼近法增添了一个自适应算法,克服了以往人工选择展开点位置的缺点,这种新的组合算法称为CG-FFT-PAIS算法。文中的数值算例证实了所述方法的有效性和实用性。The Method of Moment (MoM) in conjunction with Fade Approximation In Segments (PAIS) is applied to predict the monostatic Radar Cross-Section (RCS) pattern of an arbitrarily shaped 2-D dielectric object. In the method, integro-differential equation for the total electric field is used. In MoM procedure, to reduce the need for computer memory and to speed up the iteration, a combined algorithm of conjugate gradient method and fast Fourier transform is used to solve the algebraic system. PAIS is used to accelerate the drawing of RCS pattern. PAIS here is equipped with a procedure for selecting expanding points, and so shortcomings of original scheme of man-selecting location of expansion points are overcome. The new method is called CG-FFT-PAIS. Numerical results in this paper demonstrate the validity and the practicability of the method.

关 键 词：分段Pade逼近法 二维介质柱 单站RCS方向图 雷达 散射截面 

分 类 号：TN957.51[电子电信—信号与信息处理]