星载测雨雷达反射率因子反演算法的改进研究

Improvement Research on Radar Reflectivity Factor Retrieval Algorithm of Spaceborne Precipitation Radar

在介绍测雨雷达反演雷达反射率因子的标准算法的基础上,对雷达反射率因子反演算法进行了改进。改进算法根据测雨雷达每个分辨单元的降雨率值计算对应的等效雨滴直径,对不服从Rayleigh散射的单元进行反射率因子修正,然后再进行衰减订正等处理,以较小的计算量代价换取反演精度的提高。将处理结果与地基雷达数据进行了对比,给出了定性与定量比较的结果,验证了改进算法的有效性。

Precipitation radar＇s standard algorithms of retrieving radar reflectivity factor are introduced first and an improved method is brought forward. Equivalent raindrop diameter is computed according to rainfall rate of each radar resolution cell, and radar reflectivity factor is corrected when the cell doesn＇t obey Rayleigh scattering. Qualitative and quantitative comparisons are made among ground radar data, the improved results and PR standard data. Results show that the method is simple and effective.