Cross-correlation method for measuring ship acoustic signatures

Kil Woo Chung, Alexander Sutin, Alexander Sedunov, Michael Bruno

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

Stevens Institute of Technology has been conducting research aimed at the development of a low cost passive acoustic system for detection and classification of underwater and surface threats. The system uses several hydrophones where target bearing extraction is carried out by cross correlation of the signal from paired hydrophones. The cross correlation method is constantly being improved by Stevens. This paper presents the recent improvements aimed at the separation and measurements of ship acoustic signatures in busy conditions (when sounds from many ships are received at the same time). The developed method is based on the cross correlation calculation in two different time windows. The relatively large time window (up to 500 ms) is applied for ship bearing detections and full frequency spectra measurements. The short time window (2-5 ms) is used for measurements of detection of envelope modulation on noise acoustic signatures. The new algorithms calculating the modulation spectrum depending on the noise frequency allow finding the most modulatednoise frequency bands. This gives additional information for ship classification. The developed methods were applied for measurements of various ship acoustic signatures in the Hudson River and in the NY Bay.

Original languageEnglish
Article number055002
JournalProceedings of Meetings on Acoustics
Volume11
DOIs
StatePublished - 2011
Event160th Meeting Acoustical Society of America 2010 - Cancun, Mexico
Duration: 15 Nov 201019 Nov 2010

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