土壤表面与矩形截面柱宽带差值散射场研究  

Study on the broadband differential scattering field from the soil surface with rectangular section column

作　　者：邓旭阳 任新成[1] 朱小敏[1] 杨鹏举 赵晔[1] DENG Xuyang;REN Xincheng;ZHU Xiaomin;YANG Pengju;ZHAO Ye(School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China)

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000

出　　处：《延安大学学报（自然科学版）》2023年第4期115-120,共6页Journal of Yan'an University：Natural Science Edition

基　　金：国家自然科学基金项目(61861043,62061048,62261054)。

摘　　要：基于地物表面上方雷达目标检测、识别和分类等应用需求,采用指数型分布粗糙面和蒙特卡罗方法模拟土壤表面,用四成分模型表示土壤的介电特性,运用时域有限差分法将差值场散射理论加入到计算模型中,研究了土壤表面与矩形截面柱的宽带复合电磁散射特性,得到了差值雷达散射系数的频率响应曲线,分析了入射角,矩形截面柱倾角、中心距土壤表面的高度、长和宽及尺寸对差值雷达散射系数的影响。计算结果表明,差值雷达散射系数随频率振荡地变化,入射角、矩形截面柱倾角对差值雷达散射系数的大小影响较大且较为复杂;矩形截面柱中心距土壤表面的高度对差值雷达散射系数的大小影响不大,但对频率响应曲线的振荡幅度影响较大,并且随频率的增大而影响减小;矩形截面柱长边长度对于差值雷达散射系数的影响较小,宽边长度对差值雷达散射系数的影响较大且较为复杂,等比例放大矩形截面柱对差值雷达散射系数的影响较大且较为复杂。研究结果可为民用、军用领域工程提供理论依据和实践方法。Based on the application requirements of radar detection,recognition and classification for targets above the land surface,the soil surface was simulated by exponential distribution rough surface and Monte Carlo method,and the soil dielectric properties were represented using the four component model of Wang and Schmugge.The broadband composite electromagnetic scattering characteristics of soil surface and rectangular cross section column were studied using the finite difference time domain method and the differential scattering field theory,and the frequency response curve of radar differential scattering coefficient was obtained.The influence of incident angle,obliquity of column with rectangular section,the height of the center from the soil surface,length,width and dimen⁃sions on differential radar scattering coefficient were analyzed.The calculation results showed that the difference radar scattering coefficient oscillating varied with the frequency oscillation,the influence of incident angle and obliquity of rectangular column on the difference radar scattering coefficient were large and complex.The height between the center of rectangular cross-section column and soil surface had little influence on the difference radar scattering coefficient,but had great influence on the amplitude of frequency response curve,with the influence decreasing with the increase of frequency.The influence of the length of the long side of the rectangular crosssection column on the difference radar scattering coefficient was small,and the influence of the length of the wide side on the difference radar scattering coefficient was large and complex,the influence of equal-scale magnified rectangular cross-section column on differential radar scattering coefficient was large and complex.The results can provide theoretical basis and practical methods for engineering practice in civil and military fields.

关 键 词：宽带电磁散射 土壤表面 矩形截面柱 时域有限差分方法 差值散射场 

分 类 号：TN011[电子电信—物理电子学]