This study focuses on the latest recalibration results of the historical data of domestic satellite microwave payload, which is a national key research and development plan, to apply the long-time passive microwave historical data from Chinese satellites to the study of climate and climate change. Chinese Feng Yun 3 series satellites (FY-3) have accumulated historical microwave remote sensing data of microwave radiometer imager (MWRI), microwave temperature sounder (MWTS), and microwave humidity sounder (MWHS) for more than 13 years from May 27, 2008. We have also completed the launch and operation of four satellites in two batches. During this period, the microwave payload data of FY-3 satellite played an active role in disaster prevention and mitigation and numerical weather forecast assimilation.Based on the review of the international satellite borne microwave radiometer historical data recalibration technology, the characteristics of the microwave load of FY-3 satellite is introduced, the common technologies of operational radiation calibration and historical data recalibration are summarized, and the microwave load of the FY-3 satellite that passes through the entire link radiation transfer simulation of the instrument system is expounded. After constructing the radiation correction model under special conditions in orbit, the technical route of rescaling historical data to eliminate the radiation difference between generations based on the international reference load, the basic operational status of the FY-3 microwave payload in orbit, and the research results of historical data recalibration are introduced.The long-time sequence L1 scientific dataset of FY-3 microwave generated by recalibration is cross compared with similar international loads. Results show that the RMSE of long-time series brightness temperature data of oxygen absorption channel is 0.77 k, and the standard deviation is 0.28 k. After rescaling the water vapor absorption channel, the optimal RMSE of the long-time series data is 0.80 k, and the standard deviation is 0.20 k. In the window channel, considering the 23.8 ghz V polarization channel as an example, the RMSE of the long-time series data after re calibration is the best up to 1.29 k, and the standard deviation is 0.15k. After calibration, the maximum RMSE shall not exceed 1.5 k.Conclusion The microwave load of the FY-3 satellite has very good radiation consistency with the reference load. The recalibration results of the historical data of the FY-3 satellite microwave load provide basic support for the subsequent establishment of the FY-3 satellite microwave load basic climate data set (FCDR), Climate Data Set (CDR), and climate variable data set (ECV).

FY-3 meteorological satellite;microwave atmosphere detector;microwave imager;historical data re calibration;cross calibration