复杂陆地粗糙面及其上方坦克目标复合散射研究

研究了复杂陆地粗糙面及其上方坦克目标的复合散射特性.基于Monte Carlo方法，利用高斯谱函数模拟不同统计特性的陆地表面，运用加权反正切函数滤波处理以构造边界和连接相邻区域，构建了复杂陆地分区域复合粗糙面的几何模型.提出了一种快速精确求解复杂陆地粗糙面及其上方坦克目标复合散射的混合方法，利用迭代物理光学法求解目标与环境间的多次耦合，运用等效电磁流法修正棱边绕射.分析了复杂陆地粗糙面的散射特性，研究了入射角、均方根高度、相关长度和粗糙面表面结构对复合散射特性的影响.本研究为探测复杂环境上方的坦克目标提供了理论基础，数值仿真结果对雷达目标的探测与识别具有借鉴意义.

Composite electromagnetic scattering from tank target above complicated ground rough surface

The composite electromagnetic scattering characteristics of tank target above complicated ground rough surface are studied.Based on the Monte Carlo method,the Gauss spectral function is used to simulate different ground surfaces with different statistic properties.Weighted inverse tangent function is presented to filter in order to structure the boundary and connect adjacent regions.The geometrical model of composite rough surface of complicated ground environment is established.Aiming at fast and accurately computing composite scattering from tank target above complicated ground rough surface,a kind of new hybrid method is proposed,in which iterative physical optics (IPO) is used to calculate the multiple coupling of facets between target and environment and method of equivalent currents (MEC) is applied to meliorate edge diffraction.The curve of bi-static scattering coefficient (BSC) of complicated ground rough surface is analyzed.The influences of incident angle,root mean square (RMS),correlation length and construction on composite electromagnetic scattering characteristics are discussed.This research provides theoretical basis for detection of tank target above complicated ground rough surface.Numerical results can be used for reference in the filed of radar object detection and identification.