改进的高阶FDTD方法在散射问题中的应用  

A new improvement in the high order FDTD method for calculating scattering problems

作　　者：王健[1] 吴先良[1] 冉亮[1] 

机构地区：[1]安徽大学计算智能与信号处理教育部重点实验室,安徽合肥230039

出　　处：《合肥工业大学学报（自然科学版）》2007年第3期390-393,共4页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(69971001)

摘　　要：对Maxwell方程进行了变形,变形后的方程将所考查的媒质空间的特性集中反映在2个本构关系式中,大大简化了FDTD方法实现的难度。为了提高精度,推导了变形后麦氏方程的高阶FDTD差分格式,实现了高阶FDTD(HO-FDTD)的理想匹配层(PML)吸收边界条件,并对介质目标的雷达散射截面(RCS)进行了数值计算,计算结果表明,该方法具有很高的计算精度和计算效率。A transform is adopted in the Maxwell＇s equations, which makes the electromagnetic parameters of the media be reflected by two frame equations, thus simplifying the FDTD method. To improve the accuracy, the high order FDTD difference equations are derived and the anisotropic perfectly matched layer absorbing boundary conditions are studied in this paper. The radar cross section（RCS） of targets is computed with the presented method and numerical results are compared with the results obtained by the traditional method of FDTD. It is shown that, especially for electrically large targets, the resource of computation is reduced obviously without decreasing much accuracy.

关 键 词：电磁参数 高阶时域有限差分 理想匹配层 

分 类 号：TN011[电子电信—物理电子学]