Detector Based Field Radiometric Calibration for the Visible Band of Multi-channel Scanning Radiometer of Satellite FY-2-05

Abstract

For pre-launch field radiometric calibration for the visible channel of scanning radiometer of satellite FY-2-05,the traditional radiation calibration method has been adopted,on the other hand,a novel method called Detector Based Reflectance Calibration(DBRC) which is independent of spectral response function of scanning radiometer has been advanced.Because the integral radiation of the Standard White Reference is in direct proportion to that in a certain narrow wave band,through the selection of bands from the eight channels of the high accuracy Multi-channel radiance standard detector,the integral response radiation of the FY-2 scanning radiometer can be replaced by the narrow wave band response radiation of the high accuracy Multi-channel radiance standard detector.Therefore,the calibration coefficients can be determined directly by the high accuracy Multi-channel radiance standard detector.The uncertainty of traditional radiation calibration is about 6.0%～6.4%,while the uncertainty of DBRC reaches 5.4%.The results of the experiments demonstrate that the uncertainty of BRDC,which is based on the high accuracy cryogenic radiometry system,is much higher than that of the traditional radiation calibration which is based on the standard radiation source.