Study On The Simulation Of FY-4 AGRI's IR Channels

The next generation Chinese geostationary meteorological satellite (FY-4), the first of which will be launched on 2015, will carry a 14-channel Advanced Geosynchronous Radiometric Imager (AGRI). Out of the 14 spectral channels, six are in the visible, shortwave infrared spectrum (0.47, 0.65, 0.825, 1.375, 1.61 and 2.225μm), and the rest (3.75, 6.25, 7.1, 8.5, 10.8, 12.0 and 13.5μm) are in the infrared spectrum.After abundant of analysis, it is confirmed that having a study on channel spectral and radiation characteristics of AGRI is essential for channel setting and meteorological application. So we do the study on the simulation of FY-4 AGRI's IR channels in this paper, we put particular emphasis on radiation simulation based on the spectrum. The FY-4 Imager's IR channels'simulation results will be helpful to verify imager performance, optimize the channel setting, and support satellite data application.In this study, we apply a spectra matching method for AGRI infrared channel simulation, the method using high spectral data to simulate the radiation of a broadband imager's IR channels, The IASI (Infrared Atmospheric Sounding Interferometer) was selected as high spectral observation data source.To verify the simulation accuracy, the Multi-functional Transport Satellite (MTSAT)'s Imager (JAMI) infrared channel was simulated and validated with real image, it proves that this method is very effective for infrared channel simulation. Then, FY2E operation and GSICS calibration performance was diagnosed by this method. Finally, the radiation of AGRI infrared channels was simulated and discussed.This paper includes five chapters. Chapter 1 presents the study background; Chapter 2 introduces basic conception and method, Chapter 3 and Chapter4 are key parts of this paper, Chapter 5 concludes the conclusions of this study and proposes the further study goals.