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.
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)
关键词
时域有限差分
Mur吸收边界条件
雷达散射截面
误差
Finite-differenee time-domain
Mur＇ absorbing boundary condition
radar eross section
error
