北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2009, Vol. 32 ›› Issue (1): 77-80.doi: 10.13190/jbupt.200901.77.liup

• 论文 • 上一篇    下一篇

三维粗糙面散射中IRBC的FFT加速算法

刘鹏   

  1. 上海复旦大学波,散射与遥感信息国家教育部重点实验室,200433
  • 收稿日期:2008-06-25 修回日期:2008-11-03 出版日期:2009-01-28 发布日期:2009-01-28
  • 通讯作者: 刘鹏

An FFT Accelerated Iterative Robin Boundary Condition for 3D Rough Surface Scattering

LIU Peng   

  • Received:2008-06-25 Revised:2008-11-03 Online:2009-01-28 Published:2009-01-28
  • Contact: LIU Peng

摘要:

对于粗糙表面等以平面结构为主体的散射问题,迭代Robin边界条件( IRBC )残值计算最耗时的部分是结构上方大范围的平面虚拟边界。为减少运算量,加快计算速度,将IRBC的积分方程转化为二维卷积形式,导出快速傅立叶变换加速计算的公式。通过有限元法数值模拟三维随机粗糙表面的电磁散射,验证了方法的精度与效率。

关键词: 迭代Robin边界条件, 快速傅里叶变换, 有限元法

Abstract:

In the case of planar structure such as large-scale rough surface, most time consuming of the iterative Robin boundary condition (IRBC) evaluation is spent on the planar fictitious boundary. To reduce the computation complexity of the IRBC, a field integral equation is written as the 2-dimensional convolution form and gets solved efficiently by using the fast Fourier transform (FFT). The formulation of its mechanism is presented. And a simulation with finite element method of the electromagnetic scattering from 3-dimensional random rough surface is shown for the accuracy and efficiency.

Key words: Iterative Robin boundary condition, fast Fourier transform, finite element method