Pencil beam radar selectivity of ocean wave spectra

Manasse, R.

doi:10.2172/88599

Cited by 4 publications

(2 citation statements)

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“…If the radar is operated in staring mode, the range profile is a function of only the wavevector components along the fixed antenna azimuth. Waves propagating in other directions are filtered out due to the low resolution in azimuth [13]. A scanning radar records information on all wave directions [12], so two spatial dimensions and time may need to be simulated, but here we only simulate one spatial dimension as a function of time.…”

Section: Simulationmentioning

confidence: 99%

“…Young et al [12] performed a sophisticated three dimensional (3D) spectral analysis of data from a scanning marine radar to extract the wave spectrum. 2D analysis is sufficient for a real aperture radar operated in staring mode, because the wave pattern is only resolved in range and time, not in cross-range, due to the low azimuth resolution [13], [14]. In many studies of sea clutter from real aperture radars, only one-dimensional analysis is performed, either on a time sequence from a single range bin, or on a single range profile averaged over a short time duration.…”

Section: Introductionmentioning

confidence: 99%

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Ocean Waves in K-distributed Clutter

Bocquet¹

2021

Preprint

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<div> <div> <div> <p>Two examples of low grazing angle radar sea clutter, both well described by the compound K-distribution model, are studied. Pulse Doppler processing is applied to obtain two dimensional range-time textures for the intensity, centroid and width of the Doppler spectrum. The first example exhibits a monochromatic swell pattern, allowing phase averaging to be applied to the textures. The second example has a more typical ocean wave spectrum. The intensity textures are gamma distributed, consistent with the compound K-distribution model, but the Doppler spectrum centroid and width textures are also found to be gamma distributed. Based on this analysis, a new method for simulation of coherent radar sea clutter is proposed, where separate memoryless nonlinear transformations are applied to a simulated water surface to generate the spatially and temporally varying intensity, centroid and width of the Doppler spectrum. The method builds on the evolving Doppler spectrum model for radar sea clutter simulation and established methods for simulation of water surfaces. </p> </div> </div> </div>

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Section: Simulationmentioning

confidence: 99%