AWE应用于介质柱宽带RCS频率响应的快速计算

AWE应用于介质柱宽带RCS频率响应的快速计算

内容简介：基于渐近波形估计(AWE)技术和矩量法(MOM)快速预测任意形状、非均匀介质柱体的雷达散射截面积(RCS)的宽带频率响应.首先采用矩量法求解介质柱的电场积分方程,得到介质柱体内在某一给定频率入射波照射下的极化电流,然后利用AWE技术将任一频率入射波照射下的极化电流在给定频率附近展开成Taylor级数,通过Pade逼近将Taylor级数转化为有理函数,由此可获得介质柱在任一频率入射波照射下的极化电流,进而计算出RCS.计算结果表明AWE基本能逼近MOM精确计算的曲线,同时在计算速度上可加快近10倍.

Abstract：The method of moments (MOM) in conjunction with the asymptoticwaveform evaluation (AWE) technique is applied to predict the radar cross section (RCS) of an arbitrarily shaped two-dimensional (2-D) dielectric cylinder over a frequency band. The electric field integral equation (EFIE) of a 2-D cylinder is solved using MOM to obtain the polarization current on the cylinder. In the AWE technique, the polarization current at a given frequency is expanded in the desired frequency band in a Taylor’s series. The Taylor’s series coefficients are then matched via the Pade approximation to a rational function. Using the rational function, the polarization current is obtained at any frequency within the frequency range, which is in turn used to calculate RCS of the 2-D cylinder. It is observed that AWE can result in considerable CPU time saving.

作者：童创明, 周后型, 洪伟,

关键词：雷达散射截面, RCS, 矩量法, 渐近波形估计技术, 快速扫频, 二维介质柱