Determination of response versus scan angle for the NOAA-20 visible infrared imaging radiometer suite thermal emissive bands from emissive radiation measurements during the pitch maneuver

Aisheng Wu; Xiaoxiong Xiong

doi:10.1117/1.JRS.13.017503

12 March 2019 Determination of response versus scan angle for the NOAA-20 visible infrared imaging radiometer suite thermal emissive bands from emissive radiation measurements during the pitch maneuver

Aisheng Wu, Xiaoxiong Xiong

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 13, Issue 1, 017503 (March 2019). https://doi.org/10.1117/1.JRS.13.017503

Abstract

The visible infrared imaging radiometer suite (VIIRS) is a key sensor onboard the newly launched (November 18, 2017) NOAA-20 satellite and the early launched Suomi National Polar-orbiting Partnership (SNPP) satellite. The two VIIRS sensors are nearly identical in design. Its onboard calibration components include a solar diffuser (SD) and a SD stability monitor for the reflective solar bands, a V-grooved blackbody for the thermal emissive bands (TEBs), and a space view port for background subtraction. These onboard calibrators are located at fixed scan angles. The response versus scan angle (RVS) of the VIIRS scan mirror was characterized prelaunch in lab-ambient conditions and is currently used to calibrate the on-orbit response for all scan angles relative to the calibrator’s scan angle. A spacecraft-level pitch maneuver was scheduled during the initial intensive calibration and validation testing for both the NOAA-20 and SNPP. The pitch maneuver provided a rare opportunity for VIIRS to make observations of deep space over the entire range of the scan angle, which can be used to characterize the TEB RVS. We analyze the NOAA-20 pitch maneuver data and assess the derived TEB RVS. A comparison between the RVS determined by the pitch maneuver observations and prelaunch lab measurements is conducted for each band, detector, and mirror side of the half-angle mirror.

Citation Download Citation

Aisheng Wu and Xiaoxiong Xiong "Determination of response versus scan angle for the NOAA-20 visible infrared imaging radiometer suite thermal emissive bands from emissive radiation measurements during the pitch maneuver," Journal of Applied Remote Sensing 13(1), 017503 (12 March 2019). https://doi.org/10.1117/1.JRS.13.017503

Received: 30 April 2018; Accepted: 25 February 2019; Published: 12 March 2019

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