1.Key Laboratory of Quantitative Remote Sensing Information Technology， Aerospace Information Research Institute， Chinese Academy of Sciences， Beijing 100094， China;2.School of Optoelectronics， University of Chinese Academy of Sciences， Beijing 100049， China
Supported by the National Key Research and Development Program of China （2018YFB0504600）， National Natural Science Foundation of China （61801457）， the Bureau of International Co-operation Chinese Academy of Sciences （181811KYSB20160040）， and Key Research Program of Frontier Sciences， CAS （QYZDB-SSW-JSC051）.
Based on the characteristic of anisotropic reflectance of nighttime TOA （top-of-atmosphere）， a new method was proposed to evaluate the accuracy of on-orbit radiometric calibration of nighttime sensors using a relative accurate simulation of the nighttime radiative transfer. Specially， the Antarctic Dome C site was selected as the study area， and the nighttime on-orbit radiance was simulated by the MT2009 （Miller-Turner 2009） TOA lunar irradiance model and TOA BRDF （Bidirectional Reflectance Distribution Function） model. After the analysis of the consistency of VIIRS DNB （Visible Infrared Imaging Radiometer Suit Day/Night Band） observed and simulated radiance under the same geometry， it was found that their differences were about 4.97×10-10 W?cm-2?sr-1 one order of magnitude blow the minimum detection threshold of VIIRS DNB （3×10-9 W?cm-2?sr-1） during 2018-2020. So there is good performance of on-orbit radiometric calibration of VIIRS DNB on SNPP and NOAA-20 based on the error range of acceptable instrument sensitivity. Besides， an evaluation of on-orbit radiometric calibration stability of VIIRS DNB was conducted based on the distance-corrected radiance of SNPP VIIRS DNB and NOAA-20 VIIRS DNB. And it was found that when under the same lunar phase angle， the VIIRS DNB radiance kept a good consistency within 6% between SNPP and NOAA-20.
LI Jin-Jin, QIU Shi, ZHANG Yu, GAO Cai-Xia, QIAN Yong-Gang, LIU Yao-Kai. Performance assessments of VIIRS DNB on-orbit radiometric calibration accuracy and stability on SNPP and NOAA-20[J]. Journal of Infrared and Millimeter Waves,2021,40(6):809~819Copy