Accession Number : ADP002723

Title :   Ocean Wave Imaging by SAR (Synthetic Aperture Radars),

Corporate Author : MARCONI CO LTD CHELMSFORD (ENGLAND)

Personal Author(s) : Rotheram,S.

Report Date : AUG 1983

Pagination or Media Count : 20

Abstract : SAR imagery of the sea surface contains wave-like features. The direct imaging problem is to describe the image of a given sea surface. Four approaches are given here. These are linear imaging, Fourier series, functional expansion and asymptotic methods. Of particular interest is the loss of wave modulations due to nonlinear velocity bunching. The image power spectrum is analysed using functional expansions and the azimuthal banding is explained by stochastic nonlinear velocity bunching. The theoretical results agree closely with SEASAT data and some examples are given. The inverse sea imaging problem is to describe the sea surface corresponding to a given image. Some preliminary results using linear inversion techniques are given. (Author)

Descriptors :   *Synthetic aperture radar, *Ocean surface, *Scientific satellites, *Ocean waves, *Radar images, Nonlinear systems, Fourier series, Power spectra, Linear systems, Waves, Losses, Expansion, Inversion, Images, Methodology

Distribution Statement : APPROVED FOR PUBLIC RELEASE