二阶Mur吸收边界条件下雷达散射截面的误差修正  

Error modtification of the radar cross section under second-order Mur′s absorbing boundary condition

作　　者：王向华[1] 郑宏兴[1] 麻来宣[2] 

机构地区：[1]天津工程师范学院天线与微波技术研究所,天津300222 [2]空军工程大学导弹学院,陕西三原713800

出　　处：《天津工程师范学院学报》2010年第1期5-8,共4页Journal of Tianji University of Technology and Education

基　　金：教育部科学技术研究重点项目(207007);国家自然科学基金资助项目(60871026);天津工程师范学院科研计划项目(KJ-JH2007020)

摘　　要：为了提高时域有限差分法的计算精度,研究了二阶Mur吸收边界条件下,改变总场-散射场连接边界、数据输出边界以及吸收边界间的距离时,计算误差的变化规律。以二维金属圆柱的雷达散射截面(RCS)为例,分析了不同距离参数对双站RCS的影响。给出了减小误差的参数拟合曲线,同时提出采用两种输出边界得到RCS的平均来减小计算误差。To increase computational accuracy of the finite-difference time-domain method, the mutative law of computational errors is studied in this paper. Under second-order Mur＇s absorbing boundary condition, the error is changed with the distance between connective boundary in total-scattering field, data output boundary, and absorbing boundary changed. The radar cross section （RCS）of a two-dimensional metal cylinder has been computed. Effects of bi-static RCS from different distance parameters have been analyzed. Moreover, to modify the computation errors efficiently, a fitting curve is drawing up, and the RCS can be averaged by using data from two different output boundaries.

关 键 词：时域有限差分 Mur吸收边界条件 雷达散射截面 误差 

分 类 号：O451[理学—无线电物理] TN911[理学—物理]