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Proceedings Paper

On-orbit spectral calibration method for imaging spectrometer using atmospheric O2 absorption peak and Pr-Nd glass characteristic spectra
Author(s): Hongbo Wang; Xiaoxian Huang; Liang Ma; Xiao Zhang; Tengfei Zhang; Jun Wei
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Paper Abstract

Space-borne imaging spectrometer can be used for ocean color remote sensing and coastal zones monitoring. To meet the demand of quantitative remote sensing inversion, the imaging spectrometer needs precisely spectral calibrated before launching. However, due to the changes of space environment and degradation of the instrument performance, maybe the central wavelength or spectral width of each channel in the spectrometer varies after launching. Thus, on-orbit spectral characteristics check even recalibration for the instrument is necessary. The imaging spectrometer is capable of channel programmable and the spectral width of every pixel line of the array CCD is 2.5nm. In the field imaging experiments, the instrument showed an atmospheric O2 absorption peak near 765 nm. This characteristic peak coordinating with Pr-Nd glass, which belongs to the on-board calibration mechanism, can be used for on-orbit spectral calibration. Also, it can be used independently to calibrate the central wavelength of each channel during the earth observation. Empirical research shows that this method is not only simple and applicable but also can achieve precision of 1.25 nm and meet the practical requirements.

Paper Details

Date Published: 10 December 2014
PDF: 7 pages
Proc. SPIE 9261, Ocean Remote Sensing and Monitoring from Space, 92611O (10 December 2014); doi: 10.1117/12.2074190
Show Author Affiliations
Hongbo Wang, Shanghai Institute of Technical Physics (China)
Xiaoxian Huang, Shanghai Institute of Technical Physics (China)
Liang Ma, Shanghai Institute of Technical Physics (China)
Xiao Zhang, Shanghai Institute of Technical Physics (China)
Tengfei Zhang, Shanghai Institute of Technical Physics (China)
Jun Wei, Shanghai Institute of Technical Physics (China)

Published in SPIE Proceedings Vol. 9261:
Ocean Remote Sensing and Monitoring from Space
Robert J. Frouin; Delu Pan; Hiroshi Murakami, Editor(s)

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