三维目标与粗糙面复合散射的广义稀疏矩阵平面迭代及规范网格算法  

Bistatic scattering from three-dimensional target on perfectly conducting rough surface by using G-SMFSIA/CAG

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：《物理学报》2011年第1期22-30,共9页Acta Physica Sinica

基　　金：毫米波国家重点实验室基金(批准号:K200818;K200907)资助的课题~~

摘　　要：提出了快速计算二维导体粗糙面与面上金属目标复合散射的广义稀疏矩阵平面迭代及规范网格法(G-SMFSIA/CAG).推导了二维导体粗糙面与面上目标相互作用的耦合积分方程,用稀疏矩阵平面迭代及规范网格法(SMFSIA/CAG)求解粗糙面部分的表面积分方程,而用基于RWG基函数的矩量法(MOM)计算目标部分的表面积分方程,并通过更新方程的激励项迭代求解目标与粗糙面的相互耦合作用.结合Monte-Carlo方法产生具有PM(Pierson-Moskowitz)海浪谱的随机海洋粗糙面,数值分析了海面上不同形状导体目标的复合双站散射系数,验证了算法的有效性与收敛性.最后,计算了海面上舰船目标的双站散射系数,并讨论了不同风速海面对散射系数的影响.This paper presents a novel and powerful numerical technique called general sparse-matrix flat-surface iterative approach-canonical grid （G-SMFSIA/CAG）,which combines the sparse-matrix flat-surface iterative approach-canonical grid （SMFSIA/CAG） for 2D conducting rough surface and the method of moment （MoM） based on Rao-Wilton-Glisson （RWG） function for PEC target,to compute the electromagnetic scattering from a three-dimensional PEC target on conducting rough surface. The coupling surface integral equations （SIEs） for the composite model are derived based on Huygens surface equivalence principle. The SMFSIA/CAG is applied to solve the SIE of rough surface,and the targets’ SIE is solved using MoM. The iteration of SMFSIA/CAG and MoM takes account the interactions between target and the rough surface. Combining the PM （ Pierson-Moskowitz） sea surface generated using Monte-Carlo method,the bistatic scattering coefficient for different targets on sea surface are computed. Convergence and effectivity of the G-SMFSIA/CAG is numerically validated. The bistatic scattering coefficient from ship on sea surface is calculated finally,and the dependence of bistatic scattering pattern upon the wind speed is discussed.

关 键 词：复合散射 广义稀疏矩阵平面迭代及规范网格法 随机海洋粗糙面 双站散射系数 

分 类 号：O411[理学—理论物理]