An update of NOAA-21 VIIRS on-orbit calibration and performance

Xiaoxiong Xiong; Amit Angal; Ning Lei; Kevin Twedt; Hongda Chen; Kwofu Chiang

doi:10.1117/12.3029870

20 November 2024 An update of NOAA-21 VIIRS on-orbit calibration and performance

Xiaoxiong Xiong, Amit Angal, Ning Lei, Kevin Twedt, Hongda Chen, Kwofu Chiang

Author Affiliations +

Proceedings Volume 13192, Sensors, Systems, and Next-Generation Satellites XXVIII; 131920X (2024) https://doi.org/10.1117/12.3029870
Event: Remote Sensing, 2024, Edinburgh, United Kingdom

Abstract

The NOAA-21 VIIRS has successfully operated since its launch in November 2022 in an orbital constellation that includes the S-NPP and NOAA-20 launched in 2011 and 2017, respectively. Each VIIRS instrument makes daily global observations with 22 spectral bands, covering wavelengths from 0.41 to 12μm. It includes a day-night band (DNB) with a nominal spectral bandwidth of 0.5-0.9μm. The VIIRS instrument is regularly calibrated on orbit by a set of on-board calibrators (OBC), which include a solar diffuser (SD), a solar diffuser stability monitor (SDSM), a blackbody (BB), and a space view (SV) port. On-orbit calibration activities and strategies also include near-monthly lunar observations performed via spacecraft roll maneuvers. The lunar observations are often used along with SD measurements to help improve on-orbit calibration of the reflective solar bands. In this paper, we provide an update of NOAA-21 VIIRS on-orbit calibration and performance since launch, and a comprehensive assessment of on-orbit changes of its spectral band responses before and after the second mid-mission outgas (MMOG) performed in February 2024. In addition to detector noise characterization, the OBC performance of NOAA-21 VIIRS is illustrated and compared with that of S-NPP and NOAA-20 over the same operating period. Results show that the NOAA-21 VIIRS overall performance is comparable to or better than its predecessors.

Conference Presentation

Citation Download Citation

Xiaoxiong Xiong, Amit Angal, Ning Lei, Kevin Twedt, Hongda Chen, and Kwofu Chiang "An update of NOAA-21 VIIRS on-orbit calibration and performance", Proc. SPIE 13192, Sensors, Systems, and Next-Generation Satellites XXVIII, 131920X (20 November 2024); https://doi.org/10.1117/12.3029870

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