地下目标散射的并行FDTD计算  

Parallel FDTD computation of scattering by buried objects

作　　者：张晓燕[1] 盛新庆[1] 

机构地区：[1]北京理工大学电子工程系

出　　处：《电波科学学报》2007年第6期952-957,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No60371004);国家重点基础研究发展规划(973计划)项目(No2005CB321702)

摘　　要：着重讨论半空间FDTD并行计算方法,入射源的特殊处理方式,和如何调节负载不平衡三个问题,给出一种简单易行的地下目标雷达散射截面的并行时域有限差分(FDTD)方案,并在北京理工大学电磁仿真中心刘徽并行计算平台上,做了具体的程序实现和数值实验,实验不仅证实了算法的精度,而且还表明并行方案的高效,即当参与计算的处理器数量达到14个时,并行效率仍然可以保持在80%以上。在此基础上,用开发的程序计算了以往串行算法无法计算的电大地下典型目标的雷达散射截面。A simple approach of paralleling finite-difference time-domain （FDTD） algorithm is proposed for scattering by buried objects in this paper. The special problems in the parallel approach are discussed in detail, which are the handling skill of incident source in the half space and the load balancing issues. The programming 5kill and numerical experiments of the proposed approach are carried out in the high performance computing platform CEMS-Liuhui at the Center for Electromagnetic Simulation （CEMS）, Beijing Institute of Technology （BIT）. The accuracy and parallel efficiency of the approach are shown by the numerical results. The paralleling efficiency is greater than 80% at using 14 processors. The radar cross sections （RCS） of buried objects with large electrical size are investigated using the developed parallel program, which is difficult to be carried out using the previous sequential FDTD program.

关 键 词：并行时域有限差分 地下目标 电磁散射 单轴各向异性完全匹配层 

分 类 号：O441.1[理学—电磁学]