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针对超低空目标与地面复合电磁散射的问题,以某型巡航导弹作为超低空目标的典型代表,研究了不同类型土壤地面与其上方巡航导弹的散射特性。在考虑不同类型土壤组成成分的基础上,采用四成分土壤介电模型计算其介电常数,分析了土壤介电常数与土壤类型和土壤湿度的关系;以二维高斯粗糙面模拟地面环境,引入锥形入射波克服粗糙面的边缘衍射,应用基于物理意义的双网格法(Physics Based Two Grid,PBTG)结合稀疏矩阵规范网格法(Sparse Matrix Canonical Grid,SMCG)仿真分析了土壤类型、入射波频率与极化等因素对地面环境电磁散射特性的影响;基于目标与环境的复合表面积分方程,研究了不同类型土壤地面与巡航导弹的复合散射特性。分析表明:巡航导弹与粗糙面相互作用,使三种类型土壤地面的散射系数均有所增大。研究成果为不同类型土壤地面环境遥感探测及其上方超低空目标的探测提供了理论参考。
Aiming at the problem of low altitude targets and ground compound electromagnetic scattering, taking a cruise missile as a typical representative of ultra-low altitude targets, the scattering characteristics of different types of soil ground and cruise missiles above it are studied. Based on the four-component soil dielectric model, the dielectric constants of soil were calculated based on the four-component soil dielectric model. The relationship between soil dielectric constant and soil type and soil moisture was analyzed. Two-dimensional Gaussian rough surface was used to simulate the ground environment, The cone-shaped incident wave overcomes the edge diffraction of the rough surface. The physics based two grid (PBTG) combined with Sparse Matrix Canonical Grid (SMCG) is used to simulate the soil type, Wave frequency and polarization on the electromagnetic scattering characteristics of the ground environment. Based on the composite surface integral equation of the target and the environment, the composite scattering characteristics of different types of soil ground and cruise missiles were studied. The analysis shows that the interaction between the cruise missile and the rough surface increases the scattering coefficient of the three types of soil ground. The research results provide theoretical reference for remote sensing exploration of different types of soil ground environment and exploration of ultra-low altitude targets above them.