Solar attenuation screen transmittance, modulation, and albedo for JPSS J3 and J4

Arlette Valencia; Staci Klein; Vijay Murgai

doi:10.1117/12.2568562

26 August 2020 Solar attenuation screen transmittance, modulation, and albedo for JPSS J3 and J4

Arlette Valencia, Staci Klein, Vijay Murgai

Proceedings Volume 11501, Earth Observing Systems XXV; 115010V (2020) https://doi.org/10.1117/12.2568562
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

The Visible/Infrared Imaging Radiometer Suite (VIIRS) is a key sensor on the Suomi National Polar-orbiting Partnership (NPP) satellite as well as Joint Polar Satellite System (JPSS). VIIRS collects Earth radiometric and imagery data in 22 spectral bands from 0.4 to 12.5 μm. Radiometric calibration of the reflective solar bands in the 0.4 to 2.5 μm wavelength range is performed by measuring the sunlight reflectance from Solar Diffuser Assembly (SDA). The Solar Attenuation Screen (SAS) is designed to adjust the amount of sunlight reaching the SDA so that the albedo levels seen by VIIRS are comparable to VIIRS earth view while rejecting light reflected from the earth. As the throughput varies with sun angle of incidence, the SAS transmittance was characterized over the as use angular range (13-32 degrees in azimuth and 15-18.5 degrees in declination) with an uncertainty better than 0.2%. The setup of the test station allows for the SAS’s transmission and modulation to be measured in the as used configuration. The results of the SAS transmittance was then combined with the Bidirectional Reflectance Distribution Function (BRDF) of the SDA to calculate the albedo levels over the sun angular range used for calibration. The SAS transmittance angular variation was fit to a model to calculate the spatial signal modulation. This paper presents the SAS transmission and its spatial signal modulation for JPSS-J3 and JPSS-J4.

Conference Presentation

Citation Download Citation

Arlette Valencia, Staci Klein, and Vijay Murgai "Solar attenuation screen transmittance, modulation, and albedo for JPSS J3 and J4", Proc. SPIE 11501, Earth Observing Systems XXV, 115010V (26 August 2020); https://doi.org/10.1117/12.2568562

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