Synthetic array processing of ocean ambient noise for higher resolution seabed bottom loss estimation

Predicting transmission loss in the ocean often strongly depends on the bottom loss. Bottom loss can be estimated using ocean noise and vertical array beam-forming [Harrison and Simons, J. Acoust. Soc. Am. 112, 1377-1389 (2002)]. With finite length arrays, the bottom loss estimate using this method...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2013-03, Vol.133 (3), p.EL149-EL155
Main Authors: Siderius, Martin, Muzi, Lanfranco, Harrison, Chris H, Nielsen, Peter L
Format: Article
Language:English
Subjects:
Acoustics - instrumentation
Computer Simulation
Fourier Analysis
Geologic Sediments
Models, Theoretical
Motion
Oceans and Seas
Pressure
Signal Processing, Computer-Assisted
Sound
Time Factors
Transducers, Pressure
Water
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Summary:Predicting transmission loss in the ocean often strongly depends on the bottom loss. Bottom loss can be estimated using ocean noise and vertical array beam-forming [Harrison and Simons, J. Acoust. Soc. Am. 112, 1377-1389 (2002)]. With finite length arrays, the bottom loss estimate using this method can be smoothed due to beam widths. This paper describes how the noise coherence function can be synthetically expanded, which is similar to extending the length of an array. A full wave ocean noise model is used to demonstrate, in simulation, how this leads to improvements in the resolution of bottom loss estimates.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4774074