渐近波形估计技术应用于宽带RCS频率响应的快速获取

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

基于渐近波形估计 ( AWE)技术和矩量法 ( MOM)快速预测任意形状导电柱体 ( PEC)的雷达散射截面( RCS) .首先采用矩量法求解导体柱的电场积分方程 ,得到导体柱在某一给定频率入射波照射下的表面电流 ,然后通过 Pade逼近获得导体柱在任一频率入射波照射下的表面电流 ,进而计算出 RCS.计算结果表明其计算速度可加快近十倍 .

The method of moments (MOM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to predict the radar cross section (RCS) of an arbitrarily shaped twodimensional (2D) perfect electric conductor (PEC) cylinder over a frequency band. The electric field integral equation (EFIE) of a 2D PEC cylinder is solved by using MOM to obtain the equivalent surface current on the PEC cylinder. In the AWE technique, the equivalent surface 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. By using the rational function, the surface current is obtained at any frequency within the frequency range, which is in turn used to calculate RCS of the 2D PEC cylinder. It was observed that AWE could result in considerable CPU time saving.