AWE应用于介质柱宽带RCS频率响应的快速计算

基于渐近波形估计（AWE）技术和矩量法（MON）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化电流，然后利用AWE技术将任一频率入射波照射下的极化 给定频率附近展开成Taylor级数，通过Pade逼将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。

A Fast Frequency Sweeping Method for RCS of Dielectric Cylinders Computation Based on AWE Technique

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.