Forward scattering of pulses from a rough sea surface by Fourier synthesis of parabolic equation solutions |
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Authors: | Miles David A Hewitt Robin N Donnelly Marcus K Clarke Timothy |
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Institution: | QinetiQ, Winfrith Technology Centre, Dorset DT2 8XJ, United Kingdom. dmiles@QinetiQ.com |
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Abstract: | A variable depth step implementation of the range-dependent acoustic model (RAM) is applied to the modeling of forward scattering from a rough sea surface. The sea surface is treated within RAM simply as an internal interface between a water layer and an air upper halfspace. A comparison with a numerically exact integral equation is undertaken for the scattering of single frequencies from Pierson-Moskowitz sea surfaces. The method is extended to model the variability of linear frequency modulated pulses from a series of frozen sea surfaces in a shallow water waveguide. The subsequent effect of rough boundary scattering on the replica correlation process is investigated. |
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