Abstract
Measurements of the ambient noise background have been made with a string of seven hydrophones 200 ft long. Data were collected at a number of depths throughout the water column at a deep water site north of St. Croix, Virgin Islands. The time delay correlograms obtained confirm a binary model for the sources of ambient noise: a low-frequency type arriving preferentially from near-horizontal directions, and a high-frequency type arriving from near-vertical directions. No variation in coherence with depth was observed. The correlograms constantly fluctuate in amplitude and peak time delay, indicating that the coherence and therefore the directionality are time-variable properties of the ambient background. Coherence measurements are an alternate, and in some ways a preferable, approach to obtaining the data needed for the optimum design of arrays to operate in the real-world noise background.
Published Version
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