一种快速计算分层媒质中三维目标电磁散射的方法  

Fast Evaluation of Electromagnetic Scattering from Three Dimensional Objects Buried in Layered Media

作　　者：张云华[1] 肖伯勋[2] 朱国强[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]长江大学地球物理与石油资源学院,湖北荆州434023

出　　处：《武汉大学学报（理学版）》2007年第1期119-122,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家863计划资助项目(2001AA132050)

摘　　要：基于稳定双共轭梯度-快速傅立叶变换(BCGS-FFT)和离散复镜像方法(DCIM),快速求解了平面分层媒质中三维目标电磁散射.首先引入离散复镜像方法用以加速并矢格林函数的计算,并针对三维问题,采用了裂项计算并矢格林函数,进一步减少了时间需求.然后在离散积分方程中采用弱模式并矢格林函数,降低了积分方程的奇异性,加快了迭代算法的收敛.数值结果表明,本文方法计算耗时较改进前减少90%,适于电大尺寸问题的求解.An iterative method, weak-form stabilized bi-conjugate gradient fast Fourier transform （BCGS-FFT） is combined with discrete complex image method （DCIM） for fast evaluation of electromagnetic scattering from three dimensional objects buried in layered media. Firstly DCIM is introduced to accelerate the calculation of dyadic Green＇s function （DGF）. For volume integrate equation, DGF is split before utilizing DCIM, which furthermore reduces CPU time. Then after getting closed-form DGF, weakform DGF can be applied in discrete integrate equation to reduce the singularity, which accelerate the iteration rate. Numerical results show that, compared with the former research, the proposed method cuts 90% of the CPU time. and it is prospective in solving electrically large problems.

关 键 词：电磁散射 共轭梯度-傅立叶变换 分层媒质 离散复镜像 

分 类 号：TM154.3[电气工程—电工理论与新技术]