计算物理 ›› 2009, Vol. 26 ›› Issue (4): 569-573.

• 研究论文 • 上一篇    下一篇

快速计算地面上车辆目标的电磁散射特性

赵勋旺, 梁昌洪, 梁乐   

  1. 西安电子科技大学天线与微波技术国家重点实验室, 陕西 西安 710071
  • 收稿日期:2008-01-23 修回日期:2008-05-29 出版日期:2009-07-25 发布日期:2009-07-25
  • 作者简介:赵勋旺(1983-),山西临汾,博士生,从事电磁场数值计算,西安电子科技大学223信箱710071.
  • 基金资助:
    重点实验室基金(9140C0705010703)资助项目

Fast Computation of Electromagnetic Scattering by Vehicle Above Ground

ZHAO Xunwang, LIANG Changhong, LIANG Le   

  1. National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an 710071, China
  • Received:2008-01-23 Revised:2008-05-29 Online:2009-07-25 Published:2009-07-25

摘要: 为快速计算地面上车辆目标的电磁散射特性,实现适用于半空间环境的多层快速多极子方法.对于近区项,利用严格的半空间并矢格林函数进行计算;对于远区项,首先将半空间格林函数分解为直射项和反射项,然后采用实镜像方法计算反射项.方法物理概念清晰,与目前常用的离散复镜像方法相比,具有良好的收敛性和稳定性,大大降低计算时间和内存需求.实例计算并分析地面上汽车模型的电磁散射特性.

关键词: 电磁散射, 半空间格林函数, 多层快速多极子方法, 实镜像

Abstract: To study electromagnetic scattering by vehicle above ground,a half-space multilevel fast multipole algorithm (MLFMA) is proposed.Near terms in the MLFMA are evaluated by rigorous half-space dyadic Green functions.Far MLFMA interactions employ an approximate dyadic Green function via a direct-radiation term plus a single real image.The real image method leads to fast and convenient computation compared with the discrete complex image method (DCIM).It also results in less memory requirement and CPU time.Finally,bistatic radar cross sections are shown for a realistic 3D car model over lossy ground.

Key words: electromagnetic scattering, half-space Green's function, multilevel fast multipole algorithm, real image

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