中国空间科学技术

中国空间科学技术 ›› 2024, Vol. 44 ›› Issue (2): 154-163.doi: 10.16708/j.cnki.1000-758X.2024.0032

• 论文 • 上一篇    下一篇

基于月球的吉林一号卫星在轨辐射定标研究

胡柯，杜文亮，解延浩，杨松，舒敏，徐天弈，蔡伟，吴昀昭   

  1. 1 中国科学院紫金山天文台 行星科学重点实验室，南京210034
    2 中国科学技术大学 天文与空间科学学院，合肥230026
    3 中国矿业大学 计算机科学与技术学院，徐州221116
    4 长光卫星技术股份有限公司，长春130102
    5 澳门科技大学 月球与行星科学国家重点实验室，澳门999078
  • 出版日期:2024-04-25 发布日期:2024-04-09

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

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摘要： 为了使吉林一号卫星遥感数据得到更好的应用，利用月球为辐射源对吉林一号光谱卫星进行了在轨绝对辐射定标研究，以对实验室定标系数进行改进。考虑到定标系数具有时效性，将观测数据按时间分组后定标，利用ROLO模型计算卫星观测时刻月球辐照度，构建ROLO模型值与卫星观测值之间的关系并进行最小二乘拟合，从而获得19个谱段的两组定标系数。最后，将定标结果与吉林一号场地定标、高分四号卫星和SeaWiFS月球观测数据进行对比验证。结果表明：对月定标结果稳定，两组定标系数线性拟合的不确定度分别为1.72%和1.24%；在光谱形状上，利用月球定标后月球光谱曲线平滑，光谱形状与月球辐射特性一致，与场地定标相比，各波段相对大小在定性上得到极大改善；在绝对辐射值上，定标结果与高分四号卫星月球辐照度平均相对误差为8.1%，与SeaWiFS两个波段的平均误差为0.90%和7.42%。本研究说明月球定标是卫星在轨辐射定标及真实性检验的有效途径。

关键词: 吉林一号, 月球定标, ROLO模型, 辐射定标

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