基于AWE技术的RCS 角度和频率同时外推

基于AWE技术的RCS 角度和频率同时外推

内容简介：目标的雷达散射截面 (RCS) 与照射频率和照射角有关.本文采用矩量法(MOM)并结合渐近波形估计(AWE)技术在频域和角度上预测了任意形状二维柱体的单站RCS.采用MOM法求解电场积分方程获取柱体的等效电流.在AWE 技术中,首先将等效电流在给定频率和角度处按双变量Taylor级数展开,然后使该级数与Pade 逼近表示的有理分式函数匹配,最后利用该有理分式函数获取任意频率和角度处的等效电流,进而计算柱体的RCS.这种RCS的外推法至少有2个明显的优点:其一是能获得RCS的解析结果,其二是能降低计算时间.

Abstract：The radar cross section (RCS) of a target is dependent on frequency as well as observation angle. The method of moments (MOM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to predict the mono-static RCS of an arbitrarily shaped two-dimensional cylinder in both frequency and angular domains. The electric field integral equation (EFIE) is solved using MOM to obtain the equivalent current on the cylinder. In the AWE technique, the equivalent current at a given frequency and angle is expanded in the desired frequency and angle band in a binomial Taylor's series. The binomial Taylor's series coefficients are then matched via the Pade approximation to a rational function. Using the rational function, the current is obtained at any frequency and angle within the interesting frequency and angular range, which is in turn used to calculate RCS of the cylinder. This method for extrapolation of RCS has at least two significant advantages: one is that RCS analytical formulae are obtained and the other is it can decrease the amount of time required for modeling problems with large computational domains.

作者：童创明, 洪伟, 李皓,

关键词：雷达散射截面, RCS, 矩量法, 渐近波形估计技术, 外推