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Proceedings Paper

Results from solar reflective band end-to-end testing for VIIRS F1 sensor using T-SIRCUS
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Paper Abstract

Verification of the Visible Infrared Imager Radiometer Suite (VIIRS) End-to-End (E2E) sensor calibration is highly recommended before launch, to identify any anomalies and to improve our understanding of the sensor onorbit calibration performance. E2E testing of the Reflective Solar Bands (RSB) calibration cycle was performed pre-launch for the VIIRS Flight 1 (F1) sensor at the Ball Aerospace facility in Boulder CO in March 2010. VIIRS reflective band calibration cycle is very similar to heritage sensor MODIS in that solar illumination, via a diffuser, is used to correct for temporal variations in the instrument responsivity. Monochromatic light from the NIST T-SIRCUS (Traveling Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources) was used to illuminate both the Earth View (EV), via an integrating sphere, and the Solar Diffuser (SD) view, through a collimator. The collimator illumination was cycled through a series of angles intended to simulate the range of possible angles for which solar radiation will be incident on the solar attenuation screen on-orbit. Ideally, the measured instrument responsivity (defined here as the ratio of the detector response to the at-sensor radiance) should be the same whether the EV or SD view is illuminated. The ratio of the measured responsivities was determined at each collimator angle and wavelength. In addition, the Solar Diffuser Stability Monitor (SDSM), a ratioing radiometer designed to track the temporal variation in the SD Bidirectional Reflectance Factor (BRF) by direct comparison to solar radiation, was illuminated by the collimator. The measured SDSM ratio was compared to the predicted ratio. An uncertainty analysis was also performed on both the SD and SDSM calibrations.

Paper Details

Date Published: 13 September 2011
PDF: 15 pages
Proc. SPIE 8153, Earth Observing Systems XVI, 81530I (13 September 2011); doi: 10.1117/12.891917
Show Author Affiliations
Jeff McIntire, Sigma Space Corp. (United States)
David Moyer, The Aerospace Corp. (United States)
James K. McCarthy, Northrop Grumman Aerospace Systems (United States)
Steven W. Brown, National Institute of Standards and Technology (United States)
Keith R. Lykke, National Institute of Standards and Technology (United States)
Frank De Luccia, The Aerospace Corp. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
James J. Butler, NASA Goddard Space Flight Ctr. (United States)
Bruce Guenther, National Oceanic and Atmospheric Administration (United States)

Published in SPIE Proceedings Vol. 8153:
Earth Observing Systems XVI
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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