FY-4 is the second generation of China's geostationary meteorological satellite series. FY-4B, the second of its series, was launched on June 3rd, 2021, aiming to serve as a operational satellite. FY-4B has adjusted payloads and tuend-up performance on the basis of FY-4A scientific experiment satellite, which has been launched on December 11th, 2016 and working in orbit for more than 4 years.
FY-4B is based on the SAST5000 platform with three-axis stabilization and 1553B and Spacewire dual-buses system. It has a designed life of 7 years and launch weight of 5400kg, The main payloads onboard FY-4B are Advanced Geostationary Radiation Imager, Geostationary Interferometric Infrared Sounder, Geostationary High-speed Imager and Space Environment Package.
|AGRI||Advanced Geostationary Radiation Imager|
|GIIRS||Geostationary Interferometric Infrared Sounder|
|GHI||Geostationary High-speed Imager|
|SEP||Space Environment Monitoring Instrument Package|
|AGRI||L1 data, L2L3 product, Image|
|GIIRS||L1 data, L2L3 product|
|GHI||L1 data, L2L3 product|