土壤表面上方目标的差值散射场特性仿真研究  

Simulation Study on Differential Scattering Field Characteristics of Targets Above Soil Surface

作　　者：邓旭阳 任新成[1] 赵晔[1] 杨鹏举 DENG Xu-yang;REN Xin-cheng;ZHAO Ye;YANG Peng-ju(School of Physics and Electronic Information,Yan'an University,Yan'an Shaanxi 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：《计算机仿真》2025年第3期423-427,共5页Computer Simulation

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

摘　　要：差值散射场特性对处于大背景中微小目标的检测、识别具有重要的意义,可为民用、军用领域工程实际提供理论依据和实践方法。选用指数型分布表示土壤表面的高度起伏分布,利用蒙特卡罗方法模拟土壤表面,采用Wang和Schmugge的四成分模型计算土壤介电常数,基于Johnson的差值散射场理论,运用时域有限差分方法(FDTD)研究了土壤表面上方导体目标的复合电磁散射问题,得出了差值双站雷达散射系数,分析了入射角,矩形截面柱倾角、长和宽、中心距土壤表面的高度对差值双站雷达散射系数的影响。计算结果表明,差值双站雷达散射系数随散射角振荡地变化,入射角,矩形截面柱倾角、长和宽对差值双站雷达散射系数的影响较为复杂,中心距土壤表面的高度对差值双站雷达散射系数的影响较小。The characteristics of differential scattering field are of great significance for the detection and recognition of small targets in large backgrounds,and can provide theoretical basis and practical methods for engineering practice in civil and military fields.In this paper,the exponential distribution is selected to represent the highly undulating distribution of the soil surface,the Monte Carlo method is used to simulate the soil surface,the four-component model of Wang and Schmugge is used to calculate the soil dielectric constant,based on Johnson's difference scattering field theory,the time domain finite difference method(FDTD)is used to study the composite electromagnetic scattering problem conductor target above the soil surface,the differential two-station radar scattering coefficient is obtained,the incidence angle,rectangular section column inclination,length and width,Effect of height from the soil surface on differential bistation radar scattering coefficient.The calculation results show that the scattering coefficient of differential two-station radar changes oscillation with the scattering angle,the influence of incidence angle,inclination,length and width of rectangular section column on the scattering coefficient of differential two-station radar is more complex,and the height of the center distance from the soil surface has little influence on the scattering coefficient of differential two-station radar.

关 键 词：复合电磁散射 土壤表面 目标 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]