Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C

doi:10.1364/OE.402616

	Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C
	Xu, He-yu 2,3; Zhang, Li-ming 2; Huang, Wen-xin 2; Xu, Wei-wei 2; Si, Xiao-long 2; Chen, Hong-Yao 2; Li, Xin 2; Song, Qing-jun 1
刊名	OPTICS EXPRESS
	2020-09-28
卷号	28
ISSN号	1094-4087
DOI	10.1364/OE.402616
通讯作者	Xu, He-yu(1144152179@qq.com)
英文摘要	As the reference radiometric calibration standard of sensors on the Haiyang-1C (HY-1C) satellite platform, the satellite calibration spectrometer (SCS) is equipped with an onboard calibration system composed of double solar diffusers and an erbium-doped diffuser to monitor the postlaunch radiometric response change. Herein, through onboard calibration data analysis, the calibration diffuser performance remains stable without degradation, and the Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra is adopted as a reference to repeatedly verify onboard radiometric calibration results by selecting different dates and reflectance scenes. The SCS equivalent reflectance is obtained by combining the mean digital number (DN) of the SCS crossing area image with the radiometric calibration coefficient. The spectral reflectance is obtained via interpolation and iteration, which is adopted as the actual MODIS incident pupil spectral reflectance because the small imaging time interval can be ignored and almost vertically observed, and it is convoluted with the MODIS spectral response function to obtain the predicted equivalent reflectance. Validation is completed by comparing the predicted MODIS equivalent reflectance to the measured value based on the onboard calibration coefficient. The results show that (1) the difference between the measured and predicted MODIS band equivalent reflectance is between -0.00466 and 0.0039, and (2) the percentage difference between the measured and predicted MODIS band equivalent reflectance ranges from 4.17% and 1.24%, indicating that the calibration system carried on HY-1C can perform high-precision SCS radiometric calibration, meeting the cross-calibration accuracy requirements of other loads on the same platform. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
资助项目	National Natural Science Foundation of China[41601388]
WOS关键词	REFLECTIVE SOLAR BANDS
WOS研究方向	Optics
语种	英语
出版者	OPTICAL SOC AMER
WOS记录号	WOS:000581074800104
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/104817]
专题	中国科学院合肥物质科学研究院
通讯作者	Xu, He-yu
作者单位	1.Natl Satellite Ocean Applicat Serv, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Hefei Inst Phys Sci, Key Lab Opt Calibrat & Characterizat, Hefei 230031, Anhui, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Xu, He-yu,Zhang, Li-ming,Huang, Wen-xin,et al. Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C[J]. OPTICS EXPRESS,2020,28.
APA	Xu, He-yu.,Zhang, Li-ming.,Huang, Wen-xin.,Xu, Wei-wei.,Si, Xiao-long.,...&Song, Qing-jun.(2020).Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C.OPTICS EXPRESS,28.
MLA	Xu, He-yu,et al."Onboard absolute radiometric calibration and validation of the satellite calibration spectrometer on HY-1C".OPTICS EXPRESS 28(2020).