Abstract
Acoustic propagation experiments have begun on a newly developed shallow-water range off the south Florida coast. The measurements are concerned with fluctuations and coherence of signal and reverberation fields for ranges out to 100 km and for frequencies from 100 to 3200 Hz. The centerpiece of the experimental site is a set of three receiver arrays, two horizontal, 500 m in length, and one vertical array that is suspended in 148 m of water. A total of 96 hydrophones are processed in situ and data are transmitted to a shore station via fiber optics cable. The arrays are used to receive transmissions from a multifrequency moored source that transmits broadband M-sequences at each of six center frequencies from 100 to 3200 Hz. A first source deployment at a range of 10 km is complete and data were collected continuously for 28 days along with detailed measurements of sound-speed profile, bathymetry, and geoacoustic properties of the bottom and sub-bottom along the propagation path. Subsequent source moorings at longer ranges are underway. Results from the 32-element vertical array are presented here and compared with model predictions. Coherence and fluctuations of the signal and reverberation fields are computed and discussed. [Work supported by ONR.]
Published Version
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