摘要
证明了局部一维时域有限差分(LOD-FDTD)方法实现理想磁导体(PMC)边界时的待求场分量系数与传统的LOD-FDTD方法系数不同。通过在获得该系数前应用理想导体边界条件,得到对应的修正系数。计算了单个PMC立方体和对称的两个PMC立方体的双站RCS。计算结果表明,PMC边界作为理想导体表面时,传统LOD-FDTD方法计算误差较大,采用修正系数的计算结果与传统FDTD方法计算结果更为吻合;PMC边界作为截断计算空间的对称面,采用修正系数的计算结果与传统LOD-FDTD方法计算结果相同。采用修正系数处理PMC边界无需区分PMC边界是理想磁导体表面还是截断计算空间的对称面,具有统一的表达式,计算理想磁导体表面较传统LOD-FDTD方法误差更小。
The field coefficient on perfect magnetic conductor boundary is proved to be different from that in the conventional locally one-dimensional finite-difference time-domain （ LOD-FDTD） calculation. The correction coefficient is derived by setting PMC boundary condition before the conventional field coefficient is obtained from the implicit equations. Bistatic RCS calculations of a PMC cube and two symmetrical PMC cubes are provided by using correction coefficient method, conventional LOD -FDTD method and FDTD method, respectively. For the surface of perfect conductor, numerical results of correction coefficient meth-od agree better with those of conventional FDTD. For the symmetry plane truncated computing space, nu-merical results of correction coefficient method agree well with those of conventional LOD -FDTD. The theory proposed in this paper is validated. Correction coefficient method has unified expressions and it is found that less calculation errors occur than conventional LOD -FDTD method is used.
出处
《电讯技术》
北大核心
2013年第12期1638-1642,共5页
Telecommunication Engineering
基金
国家自然科学基金资助项目(60971041)~~
关键词
理想磁导体边界
时域有限差分方法
局部一维时域有限差分方法
PMC boundary
finite-difference time-domain （ FDTD） method
locally one-dimensional fi-nite-difference time-domain （ LOD-FDTD） method
