【摘要】 用基于辐射传输方程的电磁波散射模型详尽研究了裸露地表条件地物后向散射特性,在三种常用雷达频段(1.25GHz,4.75GHz,9.25GHz)及入射角为0°～60°范围内分析了影响雷达后向散射系数对土壤水分敏感性的地表粗糙度因素,得到一组用于地表土壤水分测量的最优雷达参数组合。在这样一组传感器参数条件下,雷达后向散射系数基本独立于地表粗糙度的变化,同时在可测量范围内保持对土壤水分一定程度的敏感性。更多还原

【Abstract】 The radar response to soil moisture content is theoretically determined for bare soil surface with different surface roughness at three frequencies: 1.25GHz, 4.75GHz, 9.25GHz and for co-polarization and cross-polarization state. Analysis of the simulation results indicates that the effect of roughness on the radar backscattering coefficient can be minimized by proper choice of the radar parameters. If , in addition, sensitivity to soil moisture content and system design constraints are considered, the following radar parameters are recommended for an operational soil moisture mapper: Radar Signal Frequency: 1.25GHz, Angle of Incidence Range: 6°-10°, Signal Polarization: HH or VV.更多还原