中文摘要：

该文提出了利用由矢量网络分析仪构造的VHF／UHF双频、多极化合成孔径雷达（SAR）测量深层土壤湿度的方法：给出植被后向散射机理、深层土壤后向散射机理，土壤介电常数模型；对裸露土壤深层后向散射、土壤介电特性给出仿真结果。通过已知的单层土壤（双层介质粗糙面模型）的后向散射验证了模型的正确性。

英文摘要：

The method of measuring deep soil moisture by VHF/UHF dual frequency multiple polarization Synthetic Aperture Radar （SAR） consisting of vector network analyzer is proposed. The backscattering mechanism of vegetation and soil at depth, dielectric properties of soil are presented. The simulation results of the backscattering of multilayered soil, dielectric properties of soil are given and the models are validated by special case of single layered soil.