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20 September 2020 Improvements in the calibration of the NOAA-20 VIIRS day-night band low gain stage using a solar diffuser
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Abstract
We aim to introduce and demonstrate several improvements that are applied to the on-orbit solar diffuser (SD) calibration of the day-night band (DNB) low gain stage (LGS) of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the NOAA-20 satellite. The most important improvement is the expansion of the angular range, referred to “sweet spot”, from 4° to 7.8° in order to increase the number of fully-illuminated scans considered for the SD calculation. The increase in scan number enables the completion of on-orbit calibration using the SD within one orbit, compared with the multiple orbits approach, which is required in the current standard approach applied in operational DNB LGS calibration coefficients look-up tables (LUTs) updates. The NOAA-20 DNB LGS calibration coefficients have been derived with the new methodology and the results show a more stable, smoother, and less noisy trend when compared with the current standard approach. The results also demonstrate that the NOAA-20 VIIRS DNB overall on-orbit performance has been very stable.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Junqiang Sun and Xiaoxiong Xiong "Improvements in the calibration of the NOAA-20 VIIRS day-night band low gain stage using a solar diffuser", Proc. SPIE 11530, Sensors, Systems, and Next-Generation Satellites XXIV, 1153014 (20 September 2020); https://doi.org/10.1117/12.2572957
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