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根据中国风云气象卫星FY-3B MWRI与近年在轨业务运行的Aqua卫星AMSR-E的技术参数,基于晴空大气辐射传输模型的模拟,分析了技术参数入射角等对辐射亮度温度Tb(Brightness temperature)的影响。以此依据,对AMSR-E原始多通道Tb数据进行入射角修正。采用二次多项式拟合方法,用入射角修正后的AMSR-ETb数据对FY-3B MWRITb数据进行各通道的辐射校准,并进行了数据对比。基于辐射校准后的FY-3BMWRI各通道Tb特征,用极化与散射特征指数,对2011年长江流域两湖地区的连续发生的干旱、降雨、水涝灾害等进行了评估与分析,并与AMSR-E的对应结果及地面观测站的记录结果进行了一致性的比较。研究表明,这些分析结果与地面观测记录比对的结果是一致的,FY-3B MWRI可以有效地监测旱涝灾害。
According to the technical parameters of China Meteorological Satellite FY-3B MWRI and Aqua Satellite AMSR-E operating in orbit in recent years, based on the simulation of the clear-air radiative transfer model, the influence of the incident angle of technical parameters on the Brightness temperature (Tb) Impact. Based on this, incident angle correction was performed on AMSR-E original multi-channel Tb data. The quadratic polynomial fitting method was used to calibrate the radiation of each channel of FY-3B MWRITb data with the AMSR-ETb data with the incident angle correction, and the data comparison was carried out. Based on the Tb characteristics of each channel of the FY-3BMWRI after radiation calibration, the successive occurrences of droughts, rainfalls and floods in the two lakes in the Yangtze River Basin in 2011 were evaluated and analyzed using the polarization and scattering characteristics indices. The results were compared with AMSR- E corresponding results and ground observation station records the results of a consistent comparison. Research shows that the results of these analyzes are consistent with those of ground-based observations, and that the FY-3B MWRI can effectively monitor droughts and floods.