基于Split-Field FDTD法的近埋地无限长散射体二维算法  

A 2-D method for scattering by infinite objects near or under ground based on Split-Field periodic FDTD technique

作　　者：易韵[1] 陈彬[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007

出　　处：《电波科学学报》2007年第3期491-496,共6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：提出了一种基于周期结构split-field FDTD法的近埋地无限长散射体二维算法。该方法根据散射体轴向均匀性将三维split-field FDTD法转化为二维算法,减少了内存和计算量,可分析斜入射脉冲波照射下近地、埋地无限长散射体散射问题。为了进一步减小计算量,连接边界上的入射波(地上为原始入射波和反射波的叠加,地下为透射波)采用一维FDTD法引入。吸收边界采用了UPML匹配层,导出了适用于split-field FDTD算法与有耗介质匹配的UPML方程。通过数值算例,验证了此二维算法应用于近埋地无限长散射体问题的有效性和实用性。A 2-D method for scattering by infinite objects near or under ground based on split-field periodic FDTD technique is proposed. The 2-D method is derived from 3-D split-field FDTD algorithm based on that the scattering object is uniform in the axial direction. As a result, the storage and computation time are greatly reduced. The 2-D method can be used to analyze scattering by infinite objects near or under the ground with oblique incidence. The incident fields （in the overground part the incident fields include the initial incident fields plus reflected component, in the subsurface the incident fields are represented by the transmitted component. ） computed by 1-D FDTD method is set on the connecting boundary. UPML is applied to be as the absorbing boundary. The UPML equations for the split-field FDTD technique terminating the lossy medium are derived. Numerical resuits show the accuracy and validity of the 2-D method analyzing scattering by infinite objects near or under ground.

关 键 词：时域有限差分 电磁散射 

分 类 号：O441.4[理学—电磁学]