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Ocean Waves in K-distributed Clutter

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posted on 14.11.2021, 06:39 authored by Stephen BocquetStephen Bocquet

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.

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Email Address of Submitting Author

stephen.bocquet@dst.defence.gov.au

ORCID of Submitting Author

0000-0002-8026-8423

Submitting Author's Institution

Defence Science and Technology Group

Submitting Author's Country

Australia

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