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通过联合SAR风场反演的地球物理模型CMOD5,与降雨对C波段SAR后向散射截面衰减的参数化关系,建立风速、降雨量与SAR后向散射截面衰减之间的仿真模型,并通过实例分析降雨对SAR后向散射截面影响程度。实验结果表明:降雨对SAR后向散射截面的衰减不可忽视,尤其在中低风速情况下影响显著,但是随着风速增大,风速对后向散射截面的影响逐渐强于降雨的衰减作用,当风速大于33m/s时,降雨对SAR后向散射截面可以忽略。
Based on the parametric relation between CMOD5, a model of geophysical inversion of SAR wind field and attenuation of C-band SAR backscattering section by rainfall, a simulation model is established between wind speed, rainfall and SAR backscatter section attenuation. Analyze the impact of rainfall on the SAR backscatter cross section. The experimental results show that the attenuation of backscatter cross section by rainfall can not be neglected, especially when the wind speed is low, but the effect of wind velocity on the backscattering cross section is stronger than that of rainfall attenuation. When the wind speed is more than 33m / s, the backscattering cross section of SAR can be neglected by rainfall.