Post-launch calibration and validation of the Geostationary Interferometric Infrared Sounder (GIIRS) on FY-4A
Received:March 29, 2019  Revised:July 23, 2019  download
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Author NameAffiliationE-mail
FENG Xuan Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China fengxuan@csu.ac.cn 
LI Li-Bing Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China  
CHEN Bo-Yang National Satellite Meteorological Center, Beijing 100081, China  
ZOU Yao-Pu Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China  
HAN Chang-Pei Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China  
Abstract:The Geostationary Interferometric Infrared Sounder (GIIRS) on board FY-4A is an infrared Fourier transform spectrometer. The primary use of GIIRS is to support numerical weather predictions by providing improved temperature and water vapor profile information, which requires high radiometric precision and accuracy. To meet the requirement, post-launch GIIRS calibration and validation activities were carried out. The spectral calibration has been done through determining the effective sampling frequency which is to take advantage of gaseous line center positions known to high accuracy. The radiometric calibration has been performed through using observation of hot and cold black body reference sources as the basis for two-point calibrations at each wavenumber. The amplitude of some spectrum bands was reduced, which may be caused by some materials gradually releasing a little gas. The estimated absolute spectral calibration uncertainty is 10 ppm, and the mean brightness temperature differences between GIIRS observations and IASI observations are all less than 1 K in the long-wave and mid-wave band.
keywords:FY-4 meteorological satellite  Geostationary Interferometric Infrared Sounder (GIIRS)  calibration  validation
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Copyright:《Journal of Infrared And Millimeter Waves》