Abstract
Time delays, associated with the direct and surface reflected arrivals, between the elements of a bottom hydrophone array can be extracted using ambient noise cross correlations [Sabra et al., J. Acoust. Soc. Am. 114, 2462 (2003)]. This is confirmed using long-time noise recordings that were collected in May 1995 near the S. California coast at an average depth of 21 m. The noise is mainly biological in the frequency range of 350–700 Hz [D’Spain et al., J. Acoust. Soc. Am. 99, 2453 (1996)]. These coherent wavefront arrivals across the array’s aperture are used for array element localization.
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