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Digital processing considerations for extraction of ocean wave image spectra from raw synthetic aperture radar dataThe digital processing requirements of several algorithms for extracting the spectrum of a detected synthetic aperture radar (SAR) image from the raw SAR data are described and compared. The most efficient algorithms for image spectrum extraction from raw SAR data appear to be those containing an intermediate image formation step. It is shown that a recently developed compact formulation of the image spectrum in terms of the raw data is computationally inefficient when evaluated directly, in comparison with the classical method where matched-filter image formation is an intermediate result. It is also shown that a proposed indirect procedure for digitally implementing the same compact formulation is somewhat more efficient than the classical matched-filtering approach. However, this indirect procedure includes the image formation process as part of the total algorithm. Indeed, the computational savings afforded by the indirect implementation are identical to those obtained in SAR image formation processing when the matched-filtering algorithm is replaced by the well-known 'dechirp-Fourier transform' technique. Furthermore, corrections to account for slant-to-ground range conversion, spherical earth, etc., are often best implemented in the image domain, making intermediate image formation a valuable processing feature.
Document ID
19840047238
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lahaie, I. J.
(Environmental Research Inst. of Michigan Ann Arbor, MI, United States)
Dias, A. R.
(Environmental Research Inst. of Michigan Ann Arbor, MI, United States)
Darling, G. D.
(Michigan, Environmental Research Institute, Ann Arbor MI, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1984
Publication Information
Publication: IEEE Journal of Oceanic Engineering
Volume: OE-9
ISSN: 0364-9059
Subject Category
Oceanography
Accession Number
84A30025
Funding Number(s)
CONTRACT_GRANT: N00014-81-C-0692
Distribution Limits
Public
Copyright
Other

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