Abstract
Over 850 hours, from an ~2 month time period, of ambient acoustic measurements were taken on a long (917m), 500 phone linear array 12 km off the coast of Fort Lauderdale, Florida, capturing both day and night, commercial and recreational shipping generated noise. Marine-band radar and AIS data were collected concurrently so that ship locations could be tracked in a large area surrounding the array. Array performance is investigated by beamforming in a number of frequency bands and apertures to determine median beam noise, noise gain reduction, and noise window statistics as a function of bearing. Additionally, the mean-square coherence is computed as a function of normalized distance (range/wavelength). The results are compared for a variety of time periods and environmental conditions. Comparisons of measurements with a computational noise model using known ship locations will be made. (Work supported by ONR base funding at NRL.)
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