摘要
针对吉林一号光谱星双相机辐射响应不一致的现象,提出基于月球定标的双相机辐射一致性校正方法。利用卫星敏捷成像特性获取双相机对月成像观测数据,解算待定标传感器月球圆盘光谱辐照度,比对Robotic Lunar Observatory(ROLO)辐照度模型,选取双相机辐射响应一致且衰减较小的谱段作为基准谱段,通过计算相对于基准谱段的辐照度比值,核算各个谱段的辐射衰减量,从而校正双相机辐射一致性。对吉林一号光谱02星进行了测试,实验结果表明,双相机辐射在各个谱段有不同程度的衰减,最大衰减量超过30%,所提方法能够有效改善图像目视效果,提高传感器辐射质量。
Objective Due to the influence of the external environment and system aging,the radiation characteristics of the camera will change after launch.It is of great importance to carry out on-orbit radiometric calibration,which converts the image grayscale value of the sensor response into spectral radiance or top of atmosphere reflectance,for remote sensing data quantitative application.Common methods of on-orbit radiometric calibration can be divided into four categories:on-board calibration,site calibration,cross calibration,and scene calibration.As a long-term stable natural celestial body in the universe,the moon has very high surface reflectivity stability.It can be used as a calibration source to avoid interference from complex atmospheres and as a supplement to the on-board calibration.At present,the internationally representative lunar radiation models are the Robotic Lunar Observatory(ROLO)model and the Miller-Turner 2009(MT2009)model.The spectral coverage of the ROLO model used in this study is 300-2550 nm,and the model uncertainty is 5%-10%.Although the ROLO model has larger uncertainty than the site calibration or on-board calibration,its relative stability can reach 1%-2%,which can be used as a normalized reference to monitor the attenuation of sensors.Many scholars use the lunar irradiance model as the basis to carry out radiometric calibration or monitor the stability of the satellite sensor by comparing the data of different months and different moon phases.However,these studies only focus on multi-temporal tracking of the on-orbit radiation performance of sensors and do not consider the consistency correction of radiation performance between different sensors and different spectral bands.In the present study,we propose a radiation consistency correction method based on lunar calibration.We hope that method can help the inconsistent radiation response of dual cameras installed on the Jilin-1 GP satellite.Methods We propose a radiation consistency correction method for dual cameras equipped with Jilin-
作者
白杨
王灵丽
武红宇
程超
杨松
黄帅
张洁
钟兴
叶中付
Bai Yang;Wang Lingli;Wu Hongyu;Cheng Chao;Yang Song;Huang Shuai;Zhang Jie;Zhong Xing;Ye Zhongfu(Chang Guang Satellite Technology Co.,Ltd.,Changchun 130000,Jilin,China;School of Information Science and Technology,University of Science and Technology of China,Hefei 230026,Anhui,China;Realsee Technology(Beijing)Co.,Ltd.,Beijing 100089,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第12期244-253,共10页
Acta Optica Sinica
基金
国家重点研发计划(2019YFE0127000)。
关键词
测量
辐射一致性
月球定标
ROLO辐照度模型
辐照度比值
measurement
radiation consistency
lunar calibration
Robotic Lunar Observatory irradiance model
irradiance ratio
