基于G-TF/SF方法的分层地表电磁环境研究  

Electromagnetic Environment of Layered Ground Based on G-TF/SF Technique

作　　者：杨超[1] 谢海燕[1] 翟鑫洋 陈再高[1] 任泽平 梁闪闪 YANG Chao;XIE Haiyan;ZHAI Xinyang;CHEN Zaigao;REN Zeping;LIANG Shanshan(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]强脉冲辐射环境模拟与效应全国重点实验室,西北核技术研究所,西安710024

出　　处：《现代应用物理》2024年第1期148-157,共10页Modern Applied Physics

基　　金：国家重点研发计划资助项目(2020YFA0709800)。

摘　　要：本文将基于广义总场散射场(generalized total-field/scattered-field,G-TF/SF)方法的时域有限差分(finite-difference time-domain,FDTD)方法用于分层地表的电磁环境计算中,四周采用卷积完全匹配层(convolutional perfectly matched layer,CPML)吸收边界条件。G-TF/SF方法可有效削减由地面四周截断产生的边缘效应,提高分层地表电磁环境计算精度且G-TF/SF边界只需要加载入射场,无需计算反射场与透射场。G-TF/SF方法将部分边界埋在完全匹配层(perfectly matched layer,PML)区域中,对埋在PML层中G-TF/SF边界的入射波乘以相应的系数,保证将合适的入射波等效到主网格区域进行计算。本文用G-TF/SF方法模拟计算了水平单层地表及不同分层地表情形下的电磁环境,并将水平单层地表结果与用解析法计算的结果进行对比;将不同分层情形与采用有限积分技术得到的结果对比,验证了G-TF/SF方法计算结果的正确性。This paper uses the finite-difference time-domain(FDTD)method based on the generalized total field/scattered-field(G-TF/SF)method to calculate the electromagnetic environment of layered ground.Convolutional perfectly matched layer(CPML)absorption boundary condition is used around the edges.The G-TF/SF method can effectively reduce the edge effects caused by ground truncation,improve the calculation accuracy of electromagnetic environment in layered ground,and the G-TF/SF boundary only needs to load the incident field without calculating the reflection and transmission fields.The G-TF/SF method allocates some boundaries in the perfectly matched layer(PML)region.The incident waves buried at the G-TF/SF boundary in the PML layer are multiplied by the corresponding coefficients to ensure that appropriate incident waves are equivalent to the main grid region for calculation.This paper uses the G-TF/SF method to simulate and calculate electromagnetic environment of horizontal single-layer ground and different layered ground expressions,and compares the results of horizontal single-layer ground with those calculated using analytical methods.The correctness of computational results by using G-TF/SF method is verified by comparing the results obtained by using finite integration techniques with different layering scenarios.

关 键 词：时域有限差分 广义总场散射场 分层地表 电磁环境 数值模拟 

分 类 号：O441[理学—电磁学] TN011[理学—物理]