THE VICARIOUS CALIBRATION FOR WATER VAPOR CHANNEL OF SPIN STABILIZATION GEOSTATIONARY METEOROLOGICAL SATELLITE

By using the radio sonde data and Lowtran 7, the radiance is calculated, and the calibration coefficients of FY-2 and GMS-5 water vapor channels are fitted. During the period of around equinox eclipse, the temperature on satellite would change rapidly, and the vicarious calibration combining with in-flight calibration would be considered. The validations are made using radiosonde data and GMS-5 observational values. The vicarious calibration has got a good result in the operations for half a year.