基于FDTD与GO结合算法的非规则地形电磁脉冲环境研究  

Analysis of Electromagnetic Pulse Environment Over Irregular Terrain Using Hybrid FDTD-GO Method

作　　者：杨超[1] 翟鑫洋 任泽平 陈再高[1] YANG Chao;ZHAI Xinyang;REN Zeping;CHEN Zaigao(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2023年第1期117-123,144,共8页Modern Applied Physics

基　　金：国家重点研发计划资助项目(2020YFA0709800)。

摘　　要：对于宽频带电磁脉冲入射波,如高空电磁脉冲,单独使用数值分析或高频近似方法解决地面的电磁散射问题均具有局限性。针对该问题,采用时域有限差分和几何光学相结合的方法可有效仿真非规则地形的电磁脉冲环境,与单独使用时域有限差分方法相比,仿真尺度有大幅提升。对于结合算法中的时域有限差分方法,采用基于广义总场散射场的时域有限差分方法,而非传统时域有限差分方法,有效减小了地面截断产生的边缘效应。通过水平地面仿真验证了方法的正确性,并给出了非规则地形(山体)的电磁脉冲环境。The interaction between electromagnetic pulse and ground has important applications in a wide range of areas.For wide-band high altitude electromagnetic pulses,there are limitations in using low frequency numerical method or high frequency approximation alone to solve the scattering of the terrain.The method combining finite-difference time-domain(FDTD)method and geometrical optics can be effectively used to simulate the electromagnetic pulse environment over the irregular terrain,and the simulation scale is much larger than that of using FDTD method alone.The FDTD method based on the generalized total-field/scattered-field is adopted instead of the traditional one,which can effectively eliminate edge effects caused by the truncation of the infinite ground.The correctness of the proposed method is verified numerically by electromagnetic simulation of the flat ground,and the simulation results of electromagnetic pulse environment under irregular terrain(mountain)are given.

关 键 词：时域有限差分 广义总场散射场 几何光学 电磁脉冲环境 非规则地形 

分 类 号：O441[理学—电磁学]