BOR-FDTD斜入射脉冲平面波一维时域算法  

BOR-FDTD algorithm for propagating obliquely incident pulsed plane wave

作　　者：陈海林[1] 陈彬[1] 关福宏[2] 方大纲[3] 愈文明[3] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007 [2]中国科学院微系统与信息技术研究所,上海200050 [3]南京理工大学,江苏南京210094

出　　处：《电波科学学报》2007年第4期680-684,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(50237040;60471013);教育部高等学校骨干教师资助计划项目资助课题

摘　　要：针对斜入射脉冲波不能直接引入BOR-FDTD计算的问题,根据柱坐标系统中入射波在对称轴方向只有时间延迟的特性,结合平面波的柱面波展开,提出了一种行之有效的计算BOR-FDTD中斜入射脉冲平面波的一维时域算法,从而避免了大量快速傅里叶变换运算,节省了计算时间。计算结果表明该算法运行速度比基于完全傅里叶变换的算法快50倍。就整个程序运行时间而言,一维时域算法可以节省约20%的计算时间。为了验证该算法的有效性,计算了高斯脉冲斜入射时有限长金属圆柱体的散射问题,提取出某一频率下圆柱体母线电流密度分布并与MoM计算结果比较,二者吻合较好。然后计算了金属球的单站RCS随频率的变化,所得结果与理论值一致性也很好。An efficient 1D FDTD algorithm was presented for propagating obliquely incident pulsed plane wave to be used in conjunction with the BOR-FDTD （body of revolution finite-difference time-domain） algorithm. The numerical result indicates that the 1D FDTD algorithm runs 50 times faster than the one using fast Fourier transform completely. So far as the whole running time of program is concerned, the 1D FDTD method can save abdut 20% CPU running time. To validate the implementation of the method, the scattering from a PEC cylinder with finite length was calculated. The surface electric current distribution along a generatrix of the cylinder at a giving frequency was extracted through fast Fourier transform. The results are good agreements with those obtained using MoM method. Finally, the radar cross section （RCS） of a metal sphere was calculated and compared with other methods.

关 键 词：旋转对称体 时域有限差分 散射 

分 类 号：O441.4[理学—电磁学]