Coherent processing of shipping noise for ocean monitoring

TitleCoherent processing of shipping noise for ocean monitoring
Publication TypeJournal Article
Year of Publication2013
AuthorsLani SW, Sabra KG, Hodgkiss WS, Kuperman WA, Roux P
JournalJournal of the Acoustical Society of America
Date Published2013/02
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000314267200007
Keywordsambient noise; emergence rate; time; wave-fronts

Ambient noise was recorded on two vertical line arrays (VLAs) separated by 450m and deployed in shallow water (depth similar to 150 m) off San Diego, CA continuously for 6 days. Recordings were dominated by non-stationary and non-uniform broadband shipping noise (250 Hz to 1.5 kHz). Stable coherent noise wavefronts were extracted from ambient noise correlations between the VLAs during all 6 days by mitigating the effect of discrete shipping events and using array beamforming with data-derived steering vectors. This procedure allows the tracking of arrival-time variations of these coherent wavefronts during 6 days and may help in developing future passive acoustic tomography systems. (C) 2013 Acoustical Society of America

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