快速计算一维分层粗糙面之间金属目标复合散射的互耦迭代算法  

EM Scattering from a PEC Target Below the Layered Rough Surface Based on the Cross Coupling Iterative Approach

作　　者：姬伟杰[1] 童创明[1,2] 

机构地区：[1]空军工程大学导弹学院,三原713800 [2]毫米波国家重点实验室,南京210096

出　　处：《电子与信息学报》2010年第10期2479-2484,共6页Journal of Electronics & Information Technology

基　　金：毫米波国家重点实验室基金(K200818)资助课题

摘　　要：为研究一维分层介质粗糙面之间金属目标的复合电磁散射特性,该文提出了一种结合前后向迭代算法(FBM)和双共轭梯度法(Bi-CG)的快速互耦迭代算法(CCIA)。推导了分层粗糙面与金属目标的耦合边界积分方程组,采用FBM和Bi-CG分别求解分层粗糙面与目标的边界积分方程,目标和分层粗糙面的相互作用通过更新两方程的激励项来实现。计算了双层介质高斯粗糙面及无限长金属圆柱的复合电磁散射特性,当目标尺寸趋于零时与只有分层粗糙面的散射系数相吻合,验证了该算法的正确性;分析了不同粗糙面情况下该算法的收敛性;讨论了目标尺寸与位置变化对复合散射系数的影响。结果表明,金属目标的存在明显影响了分层粗糙面的散射特性。To study EM scattering of a Perfectly Electric Conducting（PEC） target below the layered rough surface,a fast cross coupling iterative approach based on Bi-Conjugate Gradient（Bi-CG） method and Forward Backward Method（FBM） is presented in this paper.At first,the Electric Field Integral Equations（EFIE） of the induced currents on the rough surface and the target are derived.An iterative approach is developed to solve the two EFIE and scattering from both the target and underlying surface.The EFIE of the rough surface and the target are solved by using FBM and Bi-CG respectively.The mutual effect between the rough surface and the target are finished by iterative Calculation.The EM scattering from a metallic cylinder below the layered rough surface with two Gauss rough surfaces is computed.The result shows that the scattering coefficient is agreement with that of layered rough surfaces when the target is small enough.The relationship between the scattering pattern and the target＇s size and station are also discussed.Results show a buried PEC cylinder can significantly alter the scattering behaviors of layered rough surfaces.

关 键 词：电磁散射 分层粗糙面与金属目标 前后向迭代算法 双共轭梯度法 

分 类 号：TN011[电子电信—物理电子学]