JPSS-3 VIIRS prelaunch geometric calibration and characterization status

Ping Zhang; Guoqing Lin; Robert E. Wolfe

doi:10.1117/12.2594809

1 August 2021 JPSS-3 VIIRS prelaunch geometric calibration and characterization status

Ping Zhang, Guoqing Lin, Robert E. Wolfe

Proceedings Volume 11829, Earth Observing Systems XXVI; 118290O (2021) https://doi.org/10.1117/12.2594809
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

The NASA/NOAA Visible Infrared Imaging Radiometer Suite (VIIRS) is a key instrument in the JPSS missions (SNPP, JPSS-1-4). Being part of the calibration and validation process, JPSS-3 VIIRS prelaunch geometric performance assessment focuses on the sensor’s spatial response, band-to-band co-registration(BBR), and pointing knowledge. In general, JPSS-3 VIIRS’ prelaunch geometric performance is very good, and consistent with SNPP and JPSS-1-2 VIIRS sensors. This paper highlights some specific key findings from the JPSS-3 VIIRS’ prelaunch tests. We firs t s how that with timing adjustments, JPSS-3 VIIRS scan BBR error between VisNIR and S/M/LWIR bands has been reduced from 0.12/0.03 M sampling intervals to 0.005/0.002 M sampling intervals, respectively. Focal Plane Assembly (FPA) rotations have beenchangedfrom0.1 degree to 0.04 degree in VisVIR, from 0.18 degree to 0.09 degree in S/MWIR, and 0.16 degree to 0.08 degree in LWIR. Another finding from the pre launch test is that JPSS-3 VIIRS has relatively large band-to-band co-registration errors between VisNIR and S/M/LWIR bands in the track direction. This BBR mis - registration increases when aft‐optics assembly (AOA) temperature decreases. The BBRmis-registration is about 0.10 M sampling intervals between VisNIR and S/MWIR bands, and 0.08 M sampling intervals between Vis NIR and LW IR bands. By comparison, the track BBR offset in JPSS-2 is less than 0.02 M sampling intervals between VisNIR and S/M/LWIR bands. We also notice that the unsymmetrical Day Night Band (DNB) scan-direction Line Spread Function (LSF) of JPSS-2 VIIRS at different gain stages and aggregation modes have been corrected in J3 VIIRS.

Conference Presentation

Citation Download Citation

Ping Zhang, Guoqing Lin, and Robert E. Wolfe "JPSS-3 VIIRS prelaunch geometric calibration and characterization status", Proc. SPIE 11829, Earth Observing Systems XXVI, 118290O (1 August 2021); https://doi.org/10.1117/12.2594809

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