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Nimbus-7 scanning multichannel microwave radiometer /SMMR/ in-orbit performance appraisalCalibration and processing techniques enacted during first year of operation of the Nimbus-7 scanning multichannel microwave radiometer (SMMR) are described. It was found that in-orbit calibration was necessary, as was fine-tuning of the geophysical parameter retrieval parameters to account for anomalies such as lower-than-expected polarization differences in ocean radiances. Phase shifts in the scan angles were corrected in order to avoid polarization mixing. Calibration constants to eliminate cross-talk and phase shift effects were established for radiation reflected from the earth, then averaged over data from 300 orbits to fit points on a sine curve to better than 0.2 K accuracy. An iterative approach was determined to be necessary due to signal anomalies caused by antenna dish oscillations. Global ocean and atmosphere parameters used to construct a radiation model of ten latitude bands are presented for use in radiation transfer equations.
Document ID
19830028789
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Gloersen, P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cavalieri, D. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gatlin, J. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Spacecraft Instrumentation
Meeting Information
Meeting: International Geoscience and Remote Sensing Symposium
Location: Washington, DC
Start Date: June 8, 1981
End Date: June 10, 1981
Accession Number
83A10007
Distribution Limits
Public
Copyright
Other

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