Using ocean ambient noise for array self-localization and self-synchronization

Author

Sabra, Karim G. ; Roux, Philippe ; Thode, Aaron M. ; D´Spain, Gerald L. ; Hodgkiss, W.S. ; Kuperman, W.A.

Author_Institution

Marine Phys. Lab., Univ. of California San Diego, La Jolla, CA, USA

Volume

30

Issue

2

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

338

Lastpage

347

Abstract

Estimates of the travel times between the elements of a bottom hydrophone array can be extracted from the time-averaged ambient noise cross-correlation function (NCF). This is confirmed using 11-min-long data blocks of ambient noise recordings that were collected in May 1995 near the southern California coast at an average depth of 21 m in the 150-700 Hz frequency range. Coherent horizontal wavefronts emerging from the time derivative of the NCF are obtained across the array´s aperture and are related to the direct arrival time of the time-domain Green´s function (TDGF). These coherent wavefronts are used for array element self-localization (AESL) and array element self-synchronization (AESS). The estimated array element locations are used to beamform on a towed source.

Keywords

Green´s function methods; acoustic noise; array signal processing; hydrophones; oceanographic techniques; sonar arrays; synchronisation; time-domain analysis; underwater sound; 150 to 700 Hz; 21 m; array element self-localization; array element self-synchronization; coherent wavefronts; horizontal wavefronts; hydrophone array; noise cross-correlation function; ocean ambient noise; southern California coast; time-domain Green function; Acoustic arrays; Acoustic noise; Acoustic sensors; Aerospace and Electronic Systems Society; Frequency estimation; Frequency synchronization; Oceans; Sensor arrays; Sonar equipment; Time domain analysis; Ambient noise; array element localization; cross-correlations; inversion; synchronization;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/JOE.2005.850908

Filename

1522514