Document Detail

Arrival-time structure of the time-averaged ambient noise cross-correlation function in an oceanic waveguide.
MedLine Citation:
PMID:  15704409     Owner:  NLM     Status:  MEDLINE    
Coherent deterministic arrival times can be extracted from the derivative of the time-averaged ambient noise cross-correlation function between two receivers. These coherent arrival times are related to those of the time-domain Green's function between these two receivers and have been observed experimentally in various environments and frequency range of interest (e.g., in ultrasonics, seismology, or underwater acoustics). This nonintuitive result can be demonstrated based on a simple time-domain image formulation of the noise cross-correlation function, for a uniform distribution of noise sources in a Pekeris waveguide. This image formulation determines the influence of the noise-source distribution (in range and depth) as well as the dependence on the receiver bandwidth for the arrival-time structure of the derivative of the cross-correlation function. These results are compared with previously derived formulations of the ambient noise cross-correlation function. Practical implications of these results for sea experiments are also discussed.
Karim G Sabra; Philippe Roux; W A Kuperman
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  117     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2005-02-11     Completed Date:  2005-04-07     Revised Date:  2006-12-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  164-74     Citation Subset:  IM    
Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92103-0238, USA.
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MeSH Terms
Acoustics / instrumentation*
Models, Theoretical*
Oceans and Seas

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