基于时域物理光学法的二维导体粗糙面电磁散射特性研究.doc

文档介绍：
基于时域物理光学法的二维导体粗糙面电
磁散射特性研究#
郭立新,贾春刚,李娟*
5
10
15
20
25
30
35
40
(西安电子科技大学物理与光电工程学院,西安 710071)
摘要:本文利用时域物理光学方法(time-domain physical optics, TDPO)来研究二维导体粗糙
面的宽带电磁散射特性。该方法不仅具有频域高频算法的需要内存少,计算时间短的优势,
而且还兼有时域方法的通过一次计算就能够获得粗糙面的宽带散射特性。利用蒙特卡洛方法
模拟二维高斯粗糙面,然后通过面元处理技术将其剖分成三角面片。通过与扫频基尔霍夫近
似(Kirchhoff Approximation, KA)的后向与径向散射结果进行比较,验证该方法的有效性。给
出了粗糙面的瞬态响应以及雷达散射截面的频率分布特性。比较了不同粗糙面尺寸的径向结
果;研究了均方根高度以及相关长度对导体粗糙面散射特性的影响;最后,分析了不同入射
角下的粗糙面的后向散射特性。
关键词:电磁散射;时域物理光学;宽带;随机粗糙面
中图分类号:TN011
Time-Domain Physical Optics Method for the Analysis of
Wide-Band EM Scattering from Two-Dimensional
Conducting Rough Surface
Guo Lixin, Jia Chungang, Li Juan
(School of Physics and Optoelectronic Engineering, Xidian University, Xi’an, China (710071))
Abstract: In this paper, time-domain physical optics (TDPO) method is extended to investigate
ic (EM) scattering from two-dimensional (2D) perfectly electrical conducting (PEC)
rough surface in both time domain and frequency domain. The scheme requires relatively small
amounts puter memory and CPU time, and has advantage over the Kirchhoff Approximation
(KA) method in obtaining transient response of rough surface by a program run. The 2D Gaussian
randomly rough surface is generated by Monte Carlo method and then is partitioned into small triangle
facets though the meshing preprocess. The accuracy of TDPO is validated paring the numerical