渐近波形估计技术在涂敷导体柱宽角度RCS快速计算中的应用  

Application of AWE to Fast Calculation of Wide Angle RCS of 2-D Conducting Cylinder Covered by Dielectric

作　　者：徐利军[1] 林宝勤[1] 袁乃昌[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《微波学报》2004年第3期6-9,共4页Journal of Microwaves

摘　　要：采用渐近波形估计技术 (AWE)和矩量法相结合的方法 ,计算了TM波入射下表面涂敷有耗介质的导体柱的宽角度单站RCS ,本方法首先采用矩量法求解由电磁场等效原理得到的介质层表面等效电磁流耦合方程 ,得到柱体在某一给定方向入射波照射下的电流和磁流密度 ,然后采用渐近波形估计技术将任意角度入射波照射下的电流和磁流密度在给定的角度附近按Taylor级数展开 ,通过Pad埁逼近将Ｔａｙｌｏｒ级数转化为有理函数 ,由此可以得到涂敷导体柱在任意角度TM波入射下的电流和磁流密度 ,进而可以得到柱体的宽角度RCS。此方法得到的结果与由MOM计算的结果完全吻合 ,而AWE的计算效率却提高了一个数量级。In this paper,the asymptotic waveform evaluation(AWE) in conjunction with the m ethod of moment(MOM) is applied to compute the wide angle mono-static RCS of an arbitrarily shaped conducting cylinder covered by dielectric illuminated by the TM wave. In this method , firstly, the magnetic field integral equation and the electric field integral equation of the cylinder irradiated at a given directio n by the TM wave are obtained in terms of equivalent principle. and then these e quations are solved by using MOM to obtain the surface electric and magnetic cur rent on the dielectric layer, finally using the AWE technique, the surface elect ric and magnetic current are expanded in a rational function via the Padè appro ximation, using the function, the electric and magnetic current distributions ca n be obtained at any angle within the given angular range, which are used to com pute the scattered field and the wide-angle RCS. The numerical results are in g ood agreement with the results obtained by MOM, the computational efficiency is improved by more than an order of magnitude.

关 键 词：宽角度 TM波 TAYLOR级数 磁流 导体 柱体 入射波 渐近波形估计技术 RCS 矩量法 

分 类 号：TN953[电子电信—信号与信息处理]