Chinese Space Science and Technology ›› 2024, Vol. 44 ›› Issue (2): 154-163.doi: 10.16708/j.cnki.1000-758X.2024.0032

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On-orbit radiometric calibration of JL-1 satellite based on the moon

HU Ke,DU Wenliang,XIE Yanhao,YANG Song,SHU Min,XU Tianyi5,CAI Wei,WU Yunzhao   

  1. 1 Key Laboratory of Planetary Science,Purple Mountain Observatory of Chinese Academy of Sciences,
    Nanjing 210034,China
    2 School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China
    3 School of Computer Science and Technology,China University of Mining and Technology,Xuzhou 221116,China
    4 Chang Guang Satellite Technology Co.,LTD.,Changchun 130102,China
    5 State Key Laboratory of Lunar and Planetary Sciences,Macau University of Science and Technology,
    Macau 999078,China
  • Published:2024-04-25 Online:2024-04-09

Abstract:  In order to better apply the remote sensing data of JL-1 satellite,the onorbit absolute radiation calibration of JL-1 spectral satellite was studied by using the moon as the radiation source to improve the laboratory calibration coefficient.Considering the timeliness of the calibration coefficient,the observation data were grouped by time and then calibrated.ROLO model was used to calculate the lunar irradiance at the observation time of the satellite,the relationship between the values derived from ROLO model and the satellite observation was built,and the least squares fitting was performed to obtain two sets of scaling coefficients for 19 spectral bands.Finally,the calibration results were compared with the JL-1 site calibration and lunar observation data of GF-4 and SeaWiFS satellites.The results show that:①the lunar calibration results in this paper are stable,and the uncertainty of the linear fitting of the two sets of calibration coefficients is 1.72% and 1.24%,respectively;②in terms of the spectral shape,the lunar spectral curve is smooth after lunar calibration,and the spectral shape is consistent with the lunar radiation characteristics.Compared with the site calibration,the relative size of each band is greatly improved qualitatively;③on the absolute radiation value,the average relative error between the calibration result and the lunar irradiance derived by GF-4 satellite is 8.1%,and the average error between JL-1 and the two bands of SeaWiFS is 0.90% and 7.42%,respectively.This study shows that lunar calibration is an effective way for satellite on-orbit radiometric calibration and authenticity verification.

Key words: JL-1, lunar calibration, ROLO, radiometric calibration