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T_b (Brightness temperature)的影响.以此依据,对AMSR-E原始多通道T_b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-E T_b数据对FY-3B MWRI T_b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-3B MWRI各通道T_b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.

As a second generation of China’s polar meteorological satellite, FY-3A and FY-3B were launched in 2008 and 2010, respectively, in sun-synchronous orbits located at the altitude of 831 km. FY-3A and FY-3B load totally 11 sensors, including microwave sensors, including microwave temperature sounder (MWTS), microwave humidity sounder (MWHS) and microwave radiometer imager (MWRI). Analysis on technical features of FY-3 MWRI and AMSR-E and intercalibration can be of greatly help for future applications. In this paper, the FY-3 MWRI data over Yangtze River during spring and summer seasons of 2011 were collected because of serious drought, high temperature, precipitation and flooding. Based on radiative transfer and MWRI features, the polarization and scattering indexes for monitoring drought, precipitation and flooding happened are quantitatively analyzed. Results were also compared with both AMSR-E data and ground station records during the same periods.