各向异性完全匹配层边界条件下雷达散射截面的误差修正  

Error modification for the radar cross section under uniaxial perfectly matched layer boundary condition

作　　者：王向华[1] 郑宏兴[1] 

机构地区：[1]天津职业技术师范大学天线与微波技术研究所,天津300222

出　　处：《天津职业技术师范大学学报》2011年第1期7-10,18,共5页Journal of Tianjin University of Technology and Education

基　　金：国家自然科学基金资助项目(60871026)

摘　　要：为了提高时域有限差分法的计算精度,以二维金属圆柱散射为例,研究了在各向异性完全匹配层(UPML)吸收条件下,改变总场-散射场的输出及吸收边界时误差的变化规律。比较了UPML与二阶Mur吸收边界条件下的误差。同时发现,可采用迭代步数相差半个周期的双站雷达散射截面(RCS)的平均来减小误差,也可采用距离为半个波长的两个输出边界得到RCS的平均来减小误差。To increase computational accuracy of the finite-difference time-domain method, the mutative law of computational errors is studied in this paper. Under uniaxial perfectly matched layer （UPML） boundary condition, the error is changed with the different output boundaries and absorbing boundaries in total-scattering field. The bi-static radar cross section （RCS） of a two-dimensional metal cylinder has been computed, and the effects of the RCS from different distance parameters are analyzed. The errors are also compared between the UPML and second-order Mur＇s absorbing boundary condition. Moreover, to modify the computation errors efficiently, the RCS can be averaged by using data from an interval of one-half period or by two different output boundaries with a distance of one-half wavelength.

关 键 词：时域有限差分 各向异性完全匹配层 雷达散射截面 

分 类 号：TN957.51[电子电信—信号与信息处理]