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Application and sensitivity investigation of Fourier transforms for microwave radiometric inversionsExisting microwave radiometer technology now provides a suitable method for remote determination of the ocean surface's absolute brightness temperature. To extract the brightness temperature of the water from the antenna temperature equation, an unstable Fredholm integral equation of the first kind was solved. Fast Fourier Transform techniques were used to invert the integral after it is placed into a cross-correlation form. Application and verification of the methods to a two-dimensional modeling of a laboratory wave tank system were included. The instability of the Fredholm equation was then demonstrated and a restoration procedure was included which smooths the resulting oscillations. With the recent availability and advances of Fast Fourier Transform techniques, the method presented becomes very attractive in the evaluation of large quantities of data. Actual radiometric measurements of sea water are inverted using the restoration method, incorporating the advantages of the Fast Fourier Transform algorithm for computations.
Document ID
19750003238
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Holmes, J. J. (West Virginia Univ. Morgantown, VA, United States)
Balanis, C. A. (West Virginia Univ. Morgantown, VA, United States)
Date Acquired
September 3, 2013
Publication Date
November 15, 1974
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-140754
Accession Number
75N11310
Funding Number(s)
CONTRACT_GRANT: NGR-49-001-056
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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