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Proceedings Paper

An Overview of NASA VCST SNPP VIIRS day-night band on-orbit Calibration Methodology
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Paper 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.

Paper Details

Date Published: 26 September 2014
PDF: 15 pages
Proc. SPIE 9218, Earth Observing Systems XIX, 921808 (26 September 2014); doi: 10.1117/12.2061912
Show Author Affiliations
Shihyan Lee, Sigma Space Corp. (United States)
NASA Goddard Space Flight Ctr. (United States)
Chengbo Sun, Sigma Space Corp. (United States)
NASA Goddard Space Flight Ctr. (United States)
Vincent Kwofu Chiang, Sigma Space Corp. (United States)
NASA Goddard Space Flight Ctr. (United States)
Xiaoxiong Xiong, Sigma Space Corp. (United States)
NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 9218:
Earth Observing Systems XIX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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