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土壤表面散射特性对大地遥感等问题有着重要应用,地面对雷达波束的镜面反射是造成镜像干扰的主要原因,利用粗糙地面的布儒斯特效应将有效削弱镜面反射。采用四成分土壤介电模型计算不同类型土壤的介电常数,以二维高斯粗糙面模拟实际地面,引入锥形入射波来克服粗糙面的边缘衍射;应用基于物理意义的双网格法(PBTG)结合稀疏矩阵规范网格法(SMCG)计算分析土壤类型和湿度对地面散射特性的影响,进一步探究了粗糙地面布儒斯特效应随土壤类型、湿度及入射波频率等的变化关系。分析表明:土壤类型和湿度等因素对地面散射特性及布儒斯特效应均会产生不同程度的影响。研究成果对于不同土壤类型的地面环境遥感探测以及削弱镜像干扰提供了理论支撑。
The scattering of soil surface has an important application in the remote sensing of the earth. Specular reflection from the ground to the radar beam is the main reason causing the image interference. Using the Brewster effect of rough terrain will effectively weaken the specular reflection. The dielectric constants of different types of soils were calculated by four component soil dielectric model. The two-dimensional Gaussian rough surface was used to simulate the actual ground and the conical incident wave was introduced to overcome the edge diffraction of the rough surface. The physical double-grid method (PBTG ) Combined with the sparse matrix normalized grid method (SMCG), the influence of soil type and humidity on the scattering characteristics of the ground was analyzed and the relationship between the Brewster effect of coarse ground and soil type, humidity and incident wave frequency was further explored. The analysis shows that the soil type and humidity have different influences on the scattering characteristics and Brewster effect. The research results provide theoretical support for the remote sensing of the ground environment of different soil types and the reduction of the image interference.