Ambient noise correlations on a mobile, deformable array

TitleAmbient noise correlations on a mobile, deformable array
Publication TypeJournal Article
Year of Publication2016
AuthorsNaughton P., Roux P, Yeakle R., Schurgers C., Kastner R., Jaffe J.S, Roberts P.LD
JournalJournal of the Acoustical Society of America
Date Published2016/12
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000413510100005
Keywordscross-correlation function; deep-ocean temperatures; emergence rate; greens-function; Synchronization; time

This paper presents a demonstration of ambient acoustic noise processing on a set of free floating oceanic receivers whose relative positions vary with time. It is shown that it is possible to retrieve information that is relevant to the travel time between the receivers. With thousands of short time cross-correlations (10 s) of varying distance, it is shown that on average, the decrease in amplitude of the noise correlation function with increased separation follows a power law. This suggests that there may be amplitude information that is embedded in the noise correlation function. An incoherent beamformer is developed, which shows that it is possible to determine a source direction using an array with moving elements and large element separation. This incoherent beamformer is used to verify cases when the distribution of noise sources in the ocean allows one to recover travel time information between pairs of mobile receivers. (C) 2016 Acoustical Society of America.

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