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土壤水分在农业、气象、水文和地质领域起着重要的作用,遥感反演土壤水分一直是国内外研究的热点。TerraSAR-X是德国新一代的高分辨率雷达卫星,也是世界上首颗分辨率达1 m的商业雷达卫星,其多角度、多极化方式、高分辨率以及对同一地区短周期重复成像的特性,在监测小尺度土壤水分变化上表现出了良好的发展前景。针对TerraSAR-X,总结了雷达后向散射系数对地表参数的敏感性,并从地表粗糙度和植被影响去除两方面介绍了基于TerraSAR-X平台的土壤水分研究现状,指出了存在的问题及其今后发展方向。
Soil moisture plays an important role in agriculture, meteorology, hydrology and geology. Retrieving soil moisture by remote sensing has always been a hot topic at home and abroad. TerraSAR-X is Germany’s new generation of high-resolution radar satellites, and is the world’s first commercial radar satellite with a resolution of 1 m. Its multi-angle, multi-polarization mode, high resolution and short-period repeat imaging of the same area Characteristics, showing good development prospects in monitoring small-scale changes in soil moisture. For TerraSAR-X, the sensitivities of radar backscattering coefficients to surface parameters are summarized, and the status quo of soil moisture research based on TerraSAR-X platform is introduced from the aspects of surface roughness and vegetation effects. The existing problems and their existing problems are pointed out The future direction of development.