Paper Info
Title
FengYun-3 B Satellite Medium Resolution Spectral Imager Visible On-Board Calibrator Radiometric Output Degradation Analysis
Abstract
The output of the FengYun-3 B (FY-3B) satellite’s medium resolution spectral imager (MERSI) visible on-board calibrator (OBC) degrades with time, causing concerns regarding its reliability in radiometric calibration. Special efforts have been made to extract the variation in information of the interior lamps. The specifications include: 1) digital count retrieval from the OBC files and an exponential plus linear fit applied to determine the relative change in the MERSI response; 2) anchoring to cross calibration with MODIS to acquire the absolute radiometric calibration coefficients; 3) a time series calibration tracking method based on the pseudoinvariant target site applied to monitor the degradation of the FY-3B MERSI instrument; and 4) “net” interior lamp radiometric output (ILRO) obtained by subtracting long-term pseudoinvariant tracking results from the scaled visible on-board calibrator-based model gain coefficients. The results show that the decay rates of the ILRO are wavelength dependent and the shortwave outputs are found to experience a large degradation, particularly at 470, 550, 412, 443, 490, 520, and 565 nm. The largest annual degradation rate is greater than 15% in the first year. The implementation of the current procedure combined with a detailed analysis will provide a basis for further determining lamp changes, leading to improved absolute calibration accuracy of MERSI products.
Year
DOI
Venue
2019
10.1109/TGRS.2018.2882858
IEEE Transactions on Geoscience and Remote Sensing
Keywords
DocType
Volume
Calibration,Radiometry,Degradation,Detectors,Monitoring,Satellite broadcasting,Instruments
Journal
57
Issue
ISSN
Citations 
6
0196-2892
0
PageRank 
References 
Authors
0.34
0
8
Name
Order
Citations
PageRank
Dandan Zhi100.34
Wei Wei201.35
Yanna Zhang300.68
Tanqi Yu400.34
Yan Pan517919.23
Ling Sun601.35
Xin Li743.47
Xiaobing Zheng801.01