目标电磁散射的面中心立方体网格FDTD方法  

FDTD method of face-centered cube grid for electromagnetic scattering characteristics of object

作　　者：杨利霞 汪刘丰 陈伟[1,2] 薄勇 YANG Lixia;WANG Liufeng;CHEN Wei;BO Yong(School of Electronic Information Engineering,Anhui University,Hefei 230601,China;Key Laboratory of Target Detection and Feature Extraction of Anhui Province,Lu’an 237000,China)

机构地区：[1]安徽大学电子信息工程学院,安徽合肥230601 [2]目标探测与特征提取安徽省重点实验室,安徽六安237000

出　　处：《系统工程与电子技术》2021年第10期2718-2724,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(62071003,41874174,61901004);电磁散射重点实验室基金(61424090107);安徽省自然科学基金(2008085MF186);安徽省重点科研平台协同创新项目(GXXT-2020-050);安徽省高校协同创新计划项目(GXXT-2021-028);国家国防科工局基础研究重点项目(稳定支持项目)资助课题。

摘　　要：基于面中心立方体(face-centered cube,FCC)网格的空间结构,由麦克斯韦方程出发,推导了基于FCC网格的单轴各向异性介质完全匹配层(uniaxial anisotropic media perfectly matched layer,UPML)吸收边界条件以及近远场外推边界条件的三维迭代式。通过典型算例,先后验证了基于面中心立方体网格的时域有限差分(FCC-finite difference time domain,FCC-FDTD)方法的UPML吸收边界条件和近远场外推边界条件的正确性。最后通过计算金属球的后向雷达散射截面(radar cross section,RCS)比较了FCC-FDTD方法与传统FDTD方法的计算精度,结果显示FCC-FDTD方法具有更高的计算精度。Based on the spatial structure of the face-centered cube(FCC),starting from Maxwell’s equation,derived the 3-D iterative formulas for the absorption boundary conditions of the uniaxial anisotropic media perfectly matched layer(UPML)and near-to-far field extrapolation boundary conditions based on the FCC grid.Through typical calculation examples,the correctness of UPML absorption boundary conditions and near-to-far field extrapolation boundary conditions based on finite difference time domain method of FCC(FCCFDTD)are successively verified.Finally,the calculation accuracy of the FCC-FDTD method and the traditional FDTD method is compared by calculating the backward radar cross section(RCS)of the metal ball.The results show that the FCC-FDTD method has higher calculation accuracy.

关 键 词：面中心立方体网格 时域有限差分方法 各向异性介质完全匹配层 近远场外推 雷达散射截面 

分 类 号：O441[理学—电磁学]