CUI Cheng-guang,LI Ling,LI Yun-fei,et al.External calibration methods for geosynchronous ultraviolet-visible hyperspectral instrument[J].Optics and Precision Engineering,2021,29(03):484-492.
A geosynchronous ultraviolet-visible hyper-spectral instrument (GUVI) is deployed into a geosynchronous Earth orbit (GEO). The GUVI has high temporal and spectral resolution as well as a long lifespan. Accordingly, the research into in-orbit calibration methods is crucial to eliminating the influence of attenuation on the precision of the internal calibration device. Consequently, highly precise calibration of orbiting sensors was achieved; this ensured that GUVI remained reliable in orbit. Solar, lunar, and stellar calibration along with a GEO were proposed based on the simulation. Then an absolute in orbit radiometric calibration comprising solar and stellar calibration was proposed; the diffuser monitor was based on lunar calibration. Thus, an external calibration program was determined. Further, the corresponding equations were formulated considering the signal-to-noise ratio of stellar calibration. Finally, the uncertainties of solar, lunar, and stellar calibrations were computed as 3.6%, 3.87%, and 3.55%, respectively, thus meeting the requirements of on-orbit calibration.
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