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针对吉林西部盐碱地特性(内地苏打盐类型),应用车载双频段被动微波遥感系统,对不同盐碱状态的4个裸盐碱区进行双极化多角度微波辐射无损探测。基于多角度双频率双极化的观测数据优势,选择逼近式迭代算法来反演其介电常数虚部,Dobson模型反演介电常数实部。在此基础上,应用双频差分法研究了该区域盐碱地介电特性与含水量、含盐量的关系。双频差分结果表明:实部双频差分与盐碱土含水量呈线性关系,相关系数为0.9996;虚部双频差分与含盐量呈线性关系,相关系数为0.9977。这为应用被动微波遥感定量反演盐碱地特性(含水量、含盐量)奠定了理论基础。
According to the characteristics of saline-alkali land in the west of Jilin Province (inland soda-salt type), dual-band microwave passive radar system was used to detect four bare saline-alkali areas in different saline-alkali conditions. Based on the advantages of observed data with multi-angle and dual-frequency dual-polarization, an approximate iterative algorithm was chosen to invert the imaginary part of the permittivity and the Dobson model was used to invert the real part of the permittivity. Based on this, the relationship between dielectric properties and water content and salt content of saline-alkali soil in this region was studied by using the dual-frequency difference method. The result of dual-frequency difference shows that there is a linear relationship between the dual-frequency difference of real part and the water content of saline-alkali soil, the correlation coefficient is 0.9996. The double-frequency difference of imaginary part is linear with salinity, the correlation coefficient is 0.9977. This laid the theoretical foundation for quantitative inversion of saline-alkali land characteristics (water content and salinity) using passive microwave remote sensing.