雪层覆盖土壤表面与半埋柱体宽带复合散射FDTD方法

计算物理 ›› 2017, Vol. 34 ›› Issue (3): 327-334.

雪层覆盖土壤表面与半埋柱体宽带复合散射FDTD方法

任新成¹, 朱小敏¹, 刘鹏²

1. 延安大学物理与电子信息学院, 延安 716000;
2. 复旦大学电磁波信息科学教育部重点实验室, 上海 200433

收稿日期:2016-03-02 修回日期:2016-07-22 出版日期:2017-05-25 发布日期:2017-05-25
作者简介:任新成(1967-),男,博士,教授,主要从事计算电磁学等方面的研究,E-mail:xchren@yau.edu.cn
基金资助:
国家自然科学基金（61379026）；陕西省科学技术研究发展计划（2014K05-61）；陕西省高水平大学建设专项资金（2015SXTS02）及复旦大学电磁波信息科学教育部重点实验室开放基金（EMW201502）资助项目

FDTD Study on Wide-Band Composite Scattering from Soil Surface Covered with Snow and a Partially Buried Column

REN Xincheng¹, ZHU Xiaomin¹, LIU Peng²

1. School of Physics and Electronic Information, Yanan University, Yan'an 716000, China;
2. Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China

Received:2016-03-02 Revised:2016-07-22 Online:2017-05-25 Published:2017-05-25

摘要/Abstract

摘要： 为满足半埋目标测量和检测的需要，应用指数型分布粗糙面模型和Monte Carlo方法模拟雪层、土壤表面，运用时域有限差分方法研究雪层覆盖的土壤表面与半埋矩形截面柱复合模型的宽带电磁散射，得出宽带复合散射系数的频率响应曲线，计算宽带复合散射系数随雪层表面、土壤表面高度起伏均方根、相关长度，雪层类型、雪层厚度，土壤层含水量，矩形截面柱几何参数、倾角、埋藏深度，电磁波入射角等参数的变化. 结果表明，雪层表面高度起伏均方根、相关长度对宽带复合散射系数影响较小，其它参数对宽带复合散射系数均有显著影响且较为复杂.

关键词: 时域有限差分方法, 宽带复合散射, 雪层表面, 土壤表面, 矩形截面柱

Abstract: To meet requirement for measurement and detection of target buried partially beneath a rough surface, rough snow surface and soil surface is simulated in model of exponential type distribution rough surface with Monte Carlo method. Wide-band composite scattering from rough soil surface covered with snow and a column with rectangular cross-section buried partially is studied using finite difference time domain(FDTD). Frequency responses of wide-band composite scattering coefficient is obtained. Wide-band composite scattering coefficients varying with root-mean-square and correlation length of rough snow surface and soil surface, type of snow, thickness of snow layer, moisture capacity of soil, geometric parameter, tilt angle and buried depth of column and incident angle of electromagnetic wave are calculated. It shows that influences of root-mean-square and correlation length of rough snow surface on wide-band composite scattering coefficient are unobvious, but influences of other parameters on wide-band composite scattering coefficient are remarkable and complex.

Key words: FDTD, wide-band composite scattering, snow surface, soil surface, column with rectangular cross-section

中图分类号:

TN011

任新成, 朱小敏, 刘鹏. 雪层覆盖土壤表面与半埋柱体宽带复合散射FDTD方法[J]. 计算物理, 2017, 34(3): 327-334.

REN Xincheng, ZHU Xiaomin, LIU Peng. FDTD Study on Wide-Band Composite Scattering from Soil Surface Covered with Snow and a Partially Buried Column[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(3): 327-334.

参考文献

[1] 郭立新,张民,吴振森. 随机粗糙面与目标复合电磁散射的基本理论和方法[M]. 北京:科学出版社,2014.
[2] 郑奎松, 罗欢, 余慧,等. 分析水下目标的大比例变换总场散射场源FDTD方法[J]. 计算物理, 2016, 33(1):75-82.
[3] 田炜, 任新成, 郭立新. 分形分层粗糙面电磁波透射特性的混合算法[J]. 计算物理, 2013, 30(1):134-139.
[4] 郑召文, 杨利霞. 截断磁等离子体三维M-NPML吸收边界条件[J]. 计算物理, 2013, 30(6):895-901.
[5] 王仲根, 孙玉发, 王国华,等. 应用通用特征基函数求解目标宽带雷达散射截面[J]. 电波科学学报, 2015, 30(1):91-96.
[6] LIU P, JIN Y Q. Numerical simulation of bistatic scattering from a target at low altitude above rough sea surface under an EM-wave incidence at low grazing angle by using the finite element method[J]. IEEE Transactions on Antennas and Propagation, 2004, 52(5):1205-1209.
[7] GUO L X, XU R W. An efficient multiregion FEM-BIM for composite scattering from an arbitrary dielectric target above dielectric rough sea surfaces[J]. IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(7):3885-3896.
[8] TAO R, LI Y, BAI X, Waheed A. Fractional weierstrass model for rough ocean surface and analytical derivation of its scattered field in a closed form[J]. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(10):3627-3639.
[9] XU X K.Low observable targets detection by joint fractal properties of sea clutter:An experimental study of IPIX OHGR datasets[J].IEEE Transactions on Antennas and Propagation, 2010, 58(4):1425-1429.
[10] FLORENT J, STEPHANE S. Wavelet contribution to remote sensing of the sea and target detection for a high-frequency surface wave radar[J].IEEE Transactions on Geoscience and Remote Sensing, 2008, 5(3):552-555.
[11] ALTUNCU Y. A numerical method for electromagnetic scattering by 3-D dielectric objects buried under 2-D locally rough surfaces[J].IEEE Transactions on Antennas and Propagation, 2015, 63(8):3634-3643.
[12] EHSAN Rahidi-Ranjbar, DEHMOLLAIAN M. Target above random rough surface scattering using a parallelized IPO accelerated by MLFMM[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2015, 12(7):1481-1485.
[13] 田炜,任新成,郭立新. 海面与其上方双矩形截面柱复合散射的混合算法研究[J]. 物理学报, 2015, 64(17):174101-1-174101-7.
[14] 朱小敏, 任新成, 郭立新. 指数型粗糙地面与上方矩形截面柱宽带电磁散射的时域有限差分法研究[J].物理学报, 2014, 63(5):054101-1-054101-8.
[15] 郑帆, 郭立新, 刘伟. 风积新月形沙丘的电磁散射特性分析[J]. 西安电子科技大学学报, 2013, 40(6):133-139.
[16] 张连波, 郭立新, 苟雪银, 王安琪. 三层粗糙面电磁散射的矩量法研究[J]. 西安电子科技大学学报, 2013, 40(6):177-154.
[17] 杜红梅, 陈明生, 吴先良. 目标宽带电磁散射特性的自适应分析[J]. 物理学报, 2012, 61(9):097201-1-097201-5.
[18] ZHANG Q L, ZHANG L, HOU W H, et al. Validation of the approximate time-domain method for the lightning-horizontal electric field at the surface of two-layer earth by using FDTD[J]. IEEE Transactions on Electromagnetic Compatibility, 2014, 56(5):1121-1128.
[19] YANG G D, DU Y. An optimized monte carlo procedure and its application in electromagnetic scattering from rough surfaces[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(5):2607-2616.
[20] 李大心. 探地雷达方法与应用[M]. 北京:地质出版社,1994.
[21] 马福建, 雷少刚, 杨赛等. 土壤含水率与探地雷达信号属性的关系研究[J].土壤通报, 2014, 45(4):809-815.
[22] TOPP G C, DAVIS J L, ANNAN A P.Electromagnetic determination moist of soil water content:Measurement in coaxial transmission lines[J]. Water Retour Res,1980,16(3):574-582.