Journal ArticleDOI
The effect of orbital motions on synthetic aperture radar imagery of ocean waves
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In this article, the formation of wave-like patterns in SAR images of the ocean surface caused by orbital motions is investigated, and the degradation in azimuthal resolution due to these motions is calculated by applying a least square fit to the phase history.Abstract:
The formation of wave-like patterns in synthetic aperture radar (SAR) images of the ocean surface caused by orbital motions is investigated. Furthermore, the degradation in azimuthal resolution due to these motions is calculated by applying a least square fit to the phase history. Formulas are given which describe the variation of intensity in azimuthal direction in the image plane as well as the degradation in azimuthal resolution as a function of ocean wave amplitude, wave frequency, direction of wave propagation, and radar wavelength, incidence angle, and integration time.read more
Citations
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Journal ArticleDOI
On the detectability of ocean surface waves by real and synthetic aperture radar
TL;DR: In this article, it is shown that for a relative small range of ocean wave parameters, the likelihood that the transfer function is linear increases as the direction of wave propagation approaches the range direction, as the wavelength increases, and as the wave height decreases.
Journal ArticleDOI
On the nonlinear mapping of an ocean wave spectrum into a synthetic aperture radar image spectrum and its inversion
TL;DR: In this article, a closed nonlinear integral transformation relation is derived describing the mapping of a two-dimensional ocean wave spectrum into a synthetic aperture radar (SAR) image spectrum, and the general integral relation is expanded in a power series with respect to orders of nonlinearity and velocity bunching.
Journal ArticleDOI
Theory of synthetic aperture radar ocean imaging: A MARSEN view
Klaus Hasselmann,R. K. Raney,William J. Plant,Werner Alpers,Robert A. Shuchman,David R. Lyzenga,Clifford L. Rufenach,M. J. Tucker +7 more
TL;DR: In this article, the authors reviewed basic synthetic aperture radar (SAR) theory of ocean wave imaging mechanisms, using both known work and recent experimental and theoretical results from the Marine Remote Sensing (MARSEN) Experiment.
The State-of-the-Art in Ship Detection in Synthetic Aperture Radar Imagery
TL;DR: A review of the publicly available literature on algorithms for detecting ships in Synthetic Aperture Radar (SAR) imagery, with the aim of recommending algorithms for inclusion in the Analysts' Detection Support System (ADSS), is presented in this article.
Journal ArticleDOI
A theory of the imaging mechanism of underwater bottom topography by real and synthetic aperture radar
Werner Alpers,Ingo Hennings +1 more
TL;DR: In this paper, a simple theoretical model of the imaging mechanism of underwater bottom topography in tidal channels by real and by synthetic aperture radar (SAR) is presented, which is attributed to surface effects induced by current variations over bottom topographical features, which in turn gives rise to changes in radar reflectivity.
References
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Journal ArticleDOI
Synthetic Aperture Imaging Radar and Moving Targets
TL;DR: In this paper, the effects of slowly moving targets as they appear in the output of an airborne coherent side-looking synthetic aperture imaging radar are considered, and two approaches to airborne moving target indication (AMTI) are summarized.
Journal ArticleDOI
Microwave scattering and the straining of wind-generated waves
W. C. Keller,J. W. Wright +1 more
TL;DR: In this article, the amplitude of a 0.575-Hz plunger-generated wave was measured in a wave tank as a function of air friction velocity and plunger wave amplitude.
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The two-frequency microwave technique for measuring ocean-wave spectra from an airplane or satellite
TL;DR: In this paper, the authors investigated the applicability of the two-frequency microwave technique at slant incidence for the measurement of ocean wave spectra, first proposed by Rucket et al. (1972), with respect to its applicability in aircraft and space vehicles.
Journal ArticleDOI
Synthetic aperture radar imaging of moving ocean waves
TL;DR: In this article, a theory for the radar imaging of ocean waves is presented under the assumptions that a swell propagates through an ensemble of Bragg scatterers and that the integration time of the synthetic aperture radar (SAR) is small compared to the angular velocity of the swell.