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Calibration of the Nimbus-7 SMMR. 2: Polarization mixing correctionsAveraged radiance data obtained over the oceans from the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) are used to produce an empirical correction algorithm for the polarization mixing which is inherent to the SMMR because of its fixed multichannel receiving horn and its scanning antenna dish. The algorithm, developed without the use of an ocean/atmosphere radiance model, also properly accounts for off center and scan independent polarization mixing, which were discovered after launch as a result of analyzing the aforementioned data. The radiance averaging consisted of collecting data for each beam position of each of the ten radiance channels of SMMR (nominal horizontal and vertical polarizations of the five SMMR wavelengths, 0.81, 1.4, 1.7, 2.8, and 4.6 cm) for about 300 orbits, subdividing the global ocean radiance data into 10 deg latitude bands and ascending (daytime) and descending (nighttime) orbits. This served to smooth out atmospheric and ocean surface variations in order to perform the polarization mixing analysis.
Document ID
19830010917
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Gloersen, P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-TM-84976
NAS 1.15:84976
Accession Number
83N19188
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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