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Proceedings Paper

Comparison of VIIRS pre-launch RVS performance using results from independent studies
Author(s): A. Wu; J. Mclntire; X. Xiong; F. J. De Luccia; H. Oudrari; D. Moyer; S. Xiong; C. Pan
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Paper Abstract

The Visible Infrared Imaging Radiometer Suite (VIIRS) is a key sensor carried on the NPOESS (National Polar-orbiting Operational Environmental Satellite System) Preparatory Project (NPP) mission [1] (, and is scheduled to launch in October 2011. VIIRS sensor design draws on heritage instruments including AVHRR, OLS, MODIS, and SeaWiFS. It has on-board calibration components including a solar diffuser (SD) and a solar diffuser stability monitor (SDSM) for the reflective solar bands (RSB), a V-groove blackbody for the thermal emissive bands (TEB), and a space view (SV) port for background subtraction. These on-board calibrators are located at fixed scan angles. The VIIRS response versus scan angle (RVS) was characterized prelaunch in lab ambient conditions and will be used on-orbit to characterize the response for all scan angles relative to the calibrator scan angle (SD for RSB and blackbody for TEB). Since the RVS is vitally important to the quality of calibrated radiance products, several independent studies were performed and their results were compared and validated. This document provides RVS results from three groups: the NPP Instrument Calibration Support Team (NICST), Raytheon, and the Aerospace Corporation. A comparison of the RVS results obtained using a 2nd order polynomial fit to measurement data is conducted for each band, detector, and half angle mirror (HAM) side. The associated RVS fitting residuals are examined and compared with the relative differences in RVS found between independent studies. Results show that the agreement is within 0.1% and comparable with fitting residuals for all bands except for RSB band M9, where a difference of 0.2% was observed. Band M9 is highly sensitive to the atmospheric water vapor variations during the sensor ambient testing at Raytheon, and its correction might be a contributor to the observed RVS uncertainty differences. In general, NICST results have shown slightly larger RSB RVS uncertainties but still well within the 0.3% total uncertainty allowed for the RVS characterization defined in the Performance Verification Plan.

Paper Details

Date Published: 13 September 2011
PDF: 11 pages
Proc. SPIE 8153, Earth Observing Systems XVI, 81530L (13 September 2011); doi: 10.1117/12.892468
Show Author Affiliations
A. Wu, Sigma Space Corp. (United States)
J. Mclntire, Sigma Space Corp. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)
F. J. De Luccia, The Aerospace Corp. (United States)
H. Oudrari, Sigma Space Corp. (United States)
D. Moyer, The Aerospace Corp. (United States)
S. Xiong, Science Systems and Applications, Inc. (United States)
C. Pan, Science Systems and Applications, Inc. (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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