摘要
提出三维导体目标与导体粗糙面复合散射的解析-数值混合迭代算法,推导出三维目标与粗糙面的耦合积分方程,以及粗糙面散射的Kirchhoff近似(KA)计算式.粗糙面的KA解析计算大大降低了粗糙面求解的复杂度,与目标矩量法的混合迭代保证了计算结果的精度,使得三维体-面目标复合散射计算变得可行.由于体-面两者的高阶耦合作用明显减小,保证了该混合迭代算法的收敛性.与镜像Green函数方法的比较表明该混合算法的有效性,并讨论了粗糙面长度选择对计算结果的影响.结合Monte-Carlo方法,数值分析了理想导体Gauss粗糙面上不同取向导体椭球和有棱角的立方体的散射,给出了目标表面的感应电流分布,讨论了目标与粗糙面复合双站散射的角度性分布.
This paper presents a hybrid iterative algorithm of analytic KA-numerical MOM for scattering computation from a 3- dimensional （3-D） perfect conducting target above a randomly rough surface. The coupled integral equations （IEs） are derived for difference scattering computation. The method of moment （MoM） with the conjugate gradient （CG） approach is used to solve the target＇s IE, and the Kirchhoff approximation （KA） is applied to scattering from the rough surface. The coupling iteration takes account of the interactions between the target and the underlying rough surface. The convergence of this hybrid algorithm of KA-MoM is numerically validated. Since there is only one numerical integral along the rough surface performed for KA computation, memory and CPU time are significantly reduced. Numerical results of bistatic scattering from a PEC ellipsoid or cubic target above a Gaussian rough surface produced by Monte Carlo method are obtained.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期839-846,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:40637033
60571050)资助的课题~~
关键词
复合散射
Kirchhoff近似
共轭梯度法
互耦迭代
composite target and rough surface model, Kirchhoff approximation, conjutate gradient, coupling iteration
