Abstract
A high-frequency array was used to gather backscatter data from a sandy seabed with an anisotropic roughness spectrum. The source and receiver were fixed to a pan and tilt head so that the orientation to the seabed could be varied. A significant reduction in the backscatter was observed as the transducer was trained from the across ripple direction to the along ripple direction. The variation in backscatter with respect to the grazing angle is compared with the composite roughness model and modifications have been incorporated to take account of the bedform roughness and local grazing angle. The wideband transducer employed allowed a range of bandwidths (up to 60 kHz) to be used, including short pulse and chirp waveforms. Variation in the number of elements in the beamformed data showed the variation in backscatter due to change in beamwidth. Supporting measurements of the experiment site were made by SACLANTCEN, including stereo photography and grab samples of the sediment.
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