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Proceedings Paper

An early assessment of JPSS-1/NOAA-20 VIIRS day-night band on-orbit calibration and performance
Author(s): H. Chen; H. Oudrari; C. Sun; T. Schwarting; X. Xiong
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Paper Abstract

The JPSS-1 (now named NOAA-20) VIIRS instrument has been successfully operating on orbit since November 28th, 2017. The Day-Night Band (DNB) is a panchromatic channel covering wavelengths from 0.5 to 0.9 m that is capable of observing the Earth scene in visible/near-Infrared spectral range at spatial resolution of 750 m. The DNB operates at low, mid, or high radiometric gain stages, and it uses an onboard solar diffuser (SD) panel for low gain stage calibration. The SD observations also provide a mean to compute gain ratios between low-to-mid and mid-to-high gain stages. With their large dynamic range and high sensitivity, the DNB detectors can make observations during both daytime and nighttime. This paper provides an early assessment of the DNB on-orbit performance and behavior in the first 90-day post launch test (PLT) period and beyond. The calibration methodology used by the VIIRS Characterization Support Team (VCST) in support of the NASA earth science community will be presented. The trending of OBC dark-offsets, SD gains and gain ratios, and signal-to-noise ratio (SNR) at minimum radiance have been analyzed, especially during key events such as the Nadir and Cryo-cooler doors opening. Furthermore, we performed inter-comparison studies between SNPP and JPSS-1 instruments and evaluated DNB radiometric calibration and characterization, including the SD degradation, detector gains and gain ratios, as well as the calibration comparison between the IDPS LUTs and our VCST delivery results.

Paper Details

Date Published: 25 September 2018
PDF: 13 pages
Proc. SPIE 10785, Sensors, Systems, and Next-Generation Satellites XXII, 1078517 (25 September 2018); doi: 10.1117/12.2325451
Show Author Affiliations
H. Chen, Science Systems and Applications, Inc. (United States)
H. Oudrari, Science Systems and Applications, Inc. (United States)
C. Sun, Global Science Technology, Inc. (United States)
T. Schwarting, Global Science Technology, Inc. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10785:
Sensors, Systems, and Next-Generation Satellites XXII
Steven P. Neeck; Philippe Martimort; Toshiyoshi Kimura, Editor(s)

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