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Analyses of On-orbit Determinations of the Clouds and the Earth Radiant Energy System (CERES) Thermistor Bolometer Sensor Zero-radiance EffectsThe Clouds and Earth's Radiant Energy System (CERES) missions were designed to measure broadband earth-reflected shortwave solar (0.3 micrometers to less than 5.0 micrometers) and earth-emitted longwave (5.0 micrometers to greater than 100 micrometers) radiances as well as earth-emitted narrow-band radiances in the water vapor window region between 8 micrometers and 12 micrometers. However, the CERES scanning thermistor bolometer sensor zero-radiance offsets were found to vary as much as 1.0 Wm (exp -2) sr (exp -1) with the scan angle measurement geometry due to gravitational forces and systematic electronic noise. To minimize the gravitational effects, the Tropical Rainfall Measuring Mission (TRMM) Spacecraft CERES sensors' offsets were derived on-orbit as functions of scan elevation and azimuth angles from the January 7-8, 1998 radiometric observations of deep cold space, representative of a 3 K blackbody. In this paper, the TRMM/CERES six orbit data base of on-orbit derived offsets is presented and analyzed to define the sampling requirements for the CERES sensors located on the Earth Science Enterprise (ESE) Terra Spacecraft and on the Earth Observing System (EOS) Afternoon (PM-1) Spacecraft, scheduled for launches in 1999 and 2000, respectively. Analyses of the TRMM/CERES shortwave sensor earth radiance measurements indicate that offsets can be determined on-orbit at the plus or minus 0.02 Wm (exp -2) sr (exp -1) precision level. Offset measuring techniques and sampling requirements are discussed for the TRMM and ESE missions. Ground, pre-launch Terra CERES cross-track scan offsets are presented and described which were measured as a function of scan angle.
Document ID
20000010945
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
Lee, Robert B., III
(NASA Langley Research Center Hampton, VA United States)
Thomas, Susan
(Science Applications International Corp. Hampton, VA United States)
Priestley, Kory J.
(NASA Langley Research Center Hampton, VA United States)
Barkstrom, Bruce R.
(NASA Langley Research Center Hampton, VA United States)
Paden, Jack
(Science Applications International Corp. Hampton, VA United States)
Pandey, Dhirendra K.
(Science Applications International Corp. Hampton, VA United States)
Smith, G. Louis
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Al-hajjah, Aiman
(Science Applications International Corp. Hampton, VA United States)
Wilson, Robert S.
(Science Applications International Corp. Hampton, VA United States)
Date Acquired
August 19, 2013
Publication Date
July 1, 1999
Publication Information
Publication: Proceedings of Earth Observing Systems IV
Publisher: International Society for Optical Engineering
Volume: 3750
ISSN: 0277-786X
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: Earth Observing Systems
Location: Denver, CO
Country: United States
Start Date: July 18, 1999
End Date: July 20, 1999
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other

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