The effects of NOAA-20 VIIRS Solar Diffuser Stability Monitor (SDSM) Relative Spectral Response (RSR) on the Solar Diffuser (SD) degradation estimations

Taeyoung Choi

doi:10.1117/12.2593935

1 August 2021 The effects of NOAA-20 VIIRS Solar Diffuser Stability Monitor (SDSM) Relative Spectral Response (RSR) on the Solar Diffuser (SD) degradation estimations

Taeyoung Choi

Author Affiliations +

Proceedings Volume 11829, Earth Observing Systems XXVI; 118290W (2021) https://doi.org/10.1117/12.2593935
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Solar Diffuser (SD) has been used for on-orbit imaging sensors such as historical Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) and next generation NOAA’s Visible Infrared Imaging Radiometer Suite (VIIRS) sensors. The SD provides radiometric calibration reference for Reflective Solar Bands (RSB) and it also carries ground calibration to on-orbit. There have been slight discrepancies in the long-term radiometric calibration using SD and moon. Even though there have been some studies and publications to explain these differences, the differences were assumed to be the viewing angle differences to the SD. Using a Surface Roughness-induced Rayleigh Scattering (SRRS), we tested the current SD degradation estimation algorithms and found that the center wavelength based current SD estimation algorithm over-estimated SD degradations up to one percent level in the shortest wavelength band after two years of operation. Instead of using the center wavelength approach, the correct SD degradation was estimated by using the Relative Spectral Response (RSR) function of the SDSM detectors. After applying the correct SD degradation, the on-orbit calibration coefficients were very consistent with the moon based calibration.

Conference Presentation

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Taeyoung Choi "The effects of NOAA-20 VIIRS Solar Diffuser Stability Monitor (SDSM) Relative Spectral Response (RSR) on the Solar Diffuser (SD) degradation estimations ", Proc. SPIE 11829, Earth Observing Systems XXVI, 118290W (1 August 2021); https://doi.org/10.1117/12.2593935

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