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Radiation Budget Instrument (RBI) for JPSS-2Radiation Budget Instrument (RBI) will be one of five instruments flying aboard the JPSS-2 spacecraft, a polar-orbiting sun-synchronous satellite in Low Earth Orbit. RBI is a passive remote sensing instrument that will follow the successful legacy of the Clouds and Earth's Radiant Energy System (CERES) instruments to make measurement of Earth's short and longwave radiation budget. The goal of RBI is to provide an independent measurement of the broadband reflected solar radiance and Earth's emitted thermal radiance by using three spectral bands (Shortwave, Longwave, and Total) that will have the same overlapped point spread function (PSF) footprint on Earth. To ensure precise NIST-traceable calibration in space the RBI sensor is designed to use a visible calibration target (VCT), a solar calibration target (SCT), and an infrared calibration target (ICT) containing phase change cells (PCC) to enable on-board temperature calibration. The VCT is a thermally controlled integrating sphere with space grade Spectralon covering the inner surface. Two sides of the sphere will have fiber-coupled laser diodes in the UV to IR wavelength region. An electrical substitution radiometer on the integrating sphere will monitor the long term stability of the sources and the possible degradation of the Spectralon in space. In addition the radiometric calibration operations will use the Spectralon diffusers of the SCT to provide accurate measurements of Solar degradation. All those stable on-orbit references will ensure that calibration stability is maintained over the RBI sensor lifetime. For the preflight calibration the RBI will view five calibration sources - two integrating spheres and three CrIS (Cross-track Infrared Sounder ) -like blackbodies whose outputs will be validated with NIST calibration approach. Thermopile are the selected detectors for the RBI. The sensor has a requirement to perform lunar calibration in addition to solar calibration in space in a way similar to CERES instruments approach. To monitor climate change and to get stable and traceable results, it is critical to assure stable calibration over instrument lifetime.
Document ID
20160006908
Acquisition Source
Langley Research Center
Document Type
Presentation
Authors
Georgieva, Elena
(NASA Langley Research Center Hampton, VA, United States)
Priestley, Kory
(NASA Langley Research Center Hampton, VA, United States)
Dunn, Barry
(NASA Langley Research Center Hampton, VA, United States)
Cageao, Richard
(NASA Langley Research Center Hampton, VA, United States)
Barki, Anum
(NASA Langley Research Center Hampton, VA, United States)
Osmundsen, Jim
(NASA Langley Research Center Hampton, VA, United States)
Turczynski, Craig
(NASA Langley Research Center Hampton, VA, United States)
Abedin, Nurul
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
June 2, 2016
Publication Date
August 24, 2015
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NF1676L-20980
Meeting Information
Meeting: CALCON Technical Meeting
Location: Logan, UT
Country: United States
Start Date: August 24, 2015
End Date: August 27, 2015
Sponsors: Utah State Univ.
Funding Number(s)
WBS: WBS 852671.02.02.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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