26 September 2014 An overview of NASA VCST SNPP VIIRS day-night band on-orbit calibration methodology
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Abstract
The Day-Night Band (DNB) on Suomi-NPP VIIRS is a visible/near-Infrared panchromatic band capable of observing the earth during both daytime and nighttime. The VIIRS DNB is the first in its class to have on-orbit radiometric calibration using on-board calibrators. This paper describe the DNB calibration methodology used by the NASA VIIRS Characterization Support Team (VCST), and the process to provide consistent calibration Look-Up-Tables (LUTs). The radiometric calibration processes include (1) using the Solar Diffuser observation of the Sun to determine the gain of the DNB’s low gain stage; (2) using the Solar Diffuser signals outside of direct Sun illumination to compute the gain ratios between DNB’s low-to-mid and mid-to-high gain stages; and (3) using the nighttime calibrator observations to track the dark offset drift. Time dependent modulated Relative Spectral Responses (RSRs) are used to correct the optical throughput change due to mirror darkening. The pitch maneuver’s deep space view is used to compute the airglow free HGS offset. DNB stray light is corrected based on a correction LUT estimated from dark surface during each month’s new moon.
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Shihyan Lee, Chengbo Sun, Vincent Kwofu Chiang, Xiaoxiong Xiong, "An overview of NASA VCST SNPP VIIRS day-night band on-orbit calibration methodology", Proc. SPIE 9218, Earth Observing Systems XIX, 921808 (26 September 2014); doi: 10.1117/12.2061912; https://doi.org/10.1117/12.2061912
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