土壤表面与部分埋藏多目标复合散射的时域有限差分方法

doi:10.19596/j.cnki.1001-246x.7920

计算物理 ›› 2019, Vol. 36 ›› Issue (5): 569-576.DOI: 10.19596/j.cnki.1001-246x.7920

土壤表面与部分埋藏多目标复合散射的时域有限差分方法

任新成¹, 朱小敏¹, 郭立新²

1. 延安大学物理与电子信息学院, 陕西延安 716000;
2. 西安电子科技大学物理与光电工程学院, 陕西西安 710071

收稿日期:2018-07-05 修回日期:2018-10-10 出版日期:2019-09-25 发布日期:2019-09-25
作者简介:任新成(1967-),男,博士,教授,研究方向为计算电磁学、电磁(光)波在复杂系统和随机介质中的传播与散射,E-mail:xchren@yau.edu.cn
基金资助:
国家杰出青年科学基金（61225002）、国家自然科学基金（1379026，61861043）资助项目

Finite Difference Time Domain Method for Composite Electromagnetic Scattering from Soil Surface and Partly Buried Multiple Targets

REN Xincheng¹, ZHU Xiaomin¹, GUO Lixin²

1. School of Physics and Electronic Information, Yanan University, Yan'an Shanxi 716000, China;
2. School of Physics and Optoelectronic Engineering, Xidian University, Xi'an Shanxi 710071, China

Received:2018-07-05 Revised:2018-10-10 Online:2019-09-25 Published:2019-09-25

摘要/Abstract

摘要： 采用Dobson半经验模型和电介质复介电常数表示土壤介电常数的实部和虚部，用指数型分布粗糙面和Monte Carlo方法模拟土壤表面，运用时域有限差分方法研究土壤表面与部分埋藏多个矩形截面混凝土柱复合模型的电磁散射.结果表明：复合散射系数随散射角振荡变化；土壤表面高度起伏均方根、土壤含水率、目标介电常数、入射角对复合散射系数影响较大；土壤表面相关长度、目标截面宽度、高度、间距、倾角对复合散射系数影响较小；目标埋藏深度对复合散射系数几乎没有影响.与其他数值计算方法比较，采用时域有限差分方法既可获得较高的准确性，又可减少计算时间和内存占用量.可以用来计算地、海粗糙面与附近任意多目标的复合散射.

关键词: 时域有限差分方法, 复合散射, 土壤表面, 多目标

Abstract: Dobson semi-empirical model and dielectric complex permittivity are used to represent real and imaginary parts of soil dielectric constant. Soil surface is simulated with exponential distribution model and Monte Carlo method. Composite electromagnetic scattering from soil surface and partially buried multiple columns with rectangular cross-section is studied with finite difference time domain method. It shows that composite scattering coefficient oscillates with scattering angle. Root mean square of soil surface, soil moisture content, dielectric constant of target and incidence angle have great influence on composite scattering coefficient. Correlation length of soil surface, width, height, distance of target section, and dip angle have weak influence on composite scattering coefficient. Buried depth of target hardly has effect on composite scattering coefficient. Compared with other numerical methods, finite difference time domain method obtains higher accuracy, and reduces calculation time and amount of memory occupying as well. It can be used to calculate complex scattering from rough ground and sea surface with nearby arbitrary multiple targets.

Key words: finite difference time domain method, composite electromagnetic scattering, soil surface, multiple targets

中图分类号:

TN011

任新成, 朱小敏, 郭立新. 土壤表面与部分埋藏多目标复合散射的时域有限差分方法[J]. 计算物理, 2019, 36(5): 569-576.

REN Xincheng, ZHU Xiaomin, GUO Lixin. Finite Difference Time Domain Method for Composite Electromagnetic Scattering from Soil Surface and Partly Buried Multiple Targets[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(5): 569-576.

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土壤表面与部分埋藏多目标复合散射的时域有限差分方法

Finite Difference Time Domain Method for Composite Electromagnetic Scattering from Soil Surface and Partly Buried Multiple Targets

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