Compressive geoacoustic inversion using ambient noise

Caglar Yardim; Peter Gerstoft; William S Hodgkiss; James Traer

doi:10.1121/1.4864792

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Compressive geoacoustic inversion using ambient noise

Journal article

Peer reviewed

Compressive geoacoustic inversion using ambient noise

Caglar Yardim, Peter Gerstoft, William S Hodgkiss and James Traer

The Journal of the Acoustical Society of America, Vol.135(3), pp.1245-1255

03/2014

DOI: 10.1121/1.4864792

PMID: 24606266

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Abstract

Surface generated ambient noise can be used to infer sediment properties. Here, a passive geoacoustic inversion method that uses noise recorded by a drifting vertical array is adopted. The array is steered using beamforming to compute the noise arriving at the array from various directions. This information is used in two different ways: Coherently (cross-correlation of upward/downward propagating noise using a minimum variance distortionless response fathometer), and incoherently (bottom loss vs frequency and angle using a conventional beamformer) to obtain the bottom properties. Compressive sensing is used to invert for the number of sediment layer interfaces and their depths using coherent passive fathometry. Then the incoherent bottom loss estimate is used to refine the sediment thickness, sound speed, density, and attenuation values. Compressive sensing fathometry enables automatic determination of the number of interfaces. It also tightens the sediment thickness priors for the incoherent bottom loss inversion which reduces the search space. The method is demonstrated on drifting array data collected during the Boundary 2003 experiment.

Water

Motion

Oceans and Seas

Transducers

Oceanography - methods

Acoustics - instrumentation

Noise

Geology - methods

Equipment Design

Geologic Sediments

Geology - instrumentation

Algorithms

Time Factors

Sound Spectrography

Oceanography - instrumentation

Signal Processing, Computer-Assisted

Details

Title: Subtitle: Compressive geoacoustic inversion using ambient noise
Creators: Caglar Yardim - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
Peter Gerstoft - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
William S Hodgkiss - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
James Traer - Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
Resource Type: Journal article
Publication Details: The Journal of the Acoustical Society of America, Vol.135(3), pp.1245-1255
DOI: 10.1121/1.4864792
PMID: 24606266
NLM abbreviation: J Acoust Soc Am
ISSN: 0001-4966
eISSN: 1520-8524
Publisher: American Institute of Physics; United States
Language: English
Date published: 03/2014
Academic Unit: Psychological and Brain Sciences; Iowa Neuroscience Institute
Record Identifier: 9984065366802771

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