渐近波形估计技术在三维电磁散射中的应用

渐近波形估计技术在三维电磁散射中的应用 Fast Computation of 3-D Wide-Angle Radar Cross Section Using Asymptotic Waveform Evaluation Technique 王雷 WANG Lei~1 1 2 3 4 first-author 肖柏勋 XIAO Bai-xun~2 1 2 3 4 朱国强 ZHU Guo-qiang~1 1 2 3 4 彭文兵 PENG Wen-bing~1 1 2 3 4 叶兴彬 YE Xing-bin~1 1 2 3 4 武汉大学电子信息学院 武汉大学电子信息学院 School of Electronic Information, Wuhan University School of Electronic Information, Wuhan University 长江工程地球物理勘测研究院 长江工程地球物理勘测研究院 Institute of Changjiang Engineering Geophysical Explorations Institute of Changjiang Engineering Geophysical Explorations 武汉大学电子信息学院,湖北,武汉,430072 武汉大学电子信息学院,湖北,武汉,430072 ,湖北,武汉,430010 ,湖北,武汉,430010 将渐近波形估计（AWE）技术运用到矩量法计算宽角度三维导体的雷达散射截面（RCS）中,通过矩量法求解电场积分方程,得到导体在某一给定方向入射波照射下的感应电流,然后使用AWE技术将任意角度入射波照射下的感应电流在给定角度附近展开成Taylor级数,利用Pad啨逼近将Taylor级数转化为有理函数,由此获得三维导体在任意角度入射波照射下的感应电流,进而计算出雷达散射截面。计算结果表明:渐进波形估计技术与矩量法结合完全能够逼近矩量法计算的结果,并且计算效率提高一个数量级. The asymptotic waveform evaluation （AWE） technique was applied to method of moments to calculate the radar cross section （RCS） of an arbitrarily shaped three-dimensional perfect electric conductor over a wide angular band .The method of moments were used to solve the electric field integral （equation,） and the surface electric current density for a single angle was obtained. In the AWE technique, the surface current on the perfect electric conductor is expanded in a rational function via the Padé approximation. Using the function, the electric current distribution can be obtained at any angle within the given angular range, which is used to compute the scattered fields and the RCS. The numerical results are in good agreement with the results obtained by the method of moments at each angle. The computational efficiency is improved by more than an order of magnitude. 渐近波形估计技术 雷达散射截面 矩量法 asymptotic waveform evaluation radar cross section method of moments TN011 国家自然科学基金资助项目（50099620） 2005-03-01 2021-04-01 3