INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE

Estimation of geoacoustic models of the sea bed is an underlying research issue in understanding acoustic propagation in shallow water environments where the propagation is generally bottom limited. Inversion methods based on matched field processing have become widely used in applications with expe...

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Autores principales:	Ross Chapman,N, Dizaji,Reza M, Lynn Kirlin,R
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2004
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200020
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spelling	oai:scielo:S0717-653820040002000202005-09-14INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISERoss Chapman,NDizaji,Reza MLynn Kirlin,REstimation of geoacoustic models of the sea bed is an underlying research issue in understanding acoustic propagation in shallow water environments where the propagation is generally bottom limited. Inversion methods based on matched field processing have become widely used in applications with experimental data at various sites worldwide. Traditionally, the experiments have been carried out with controlled source geometries. This paper presents a new experimental approach that makes use of the noise radiated by passing ships as the sound source for the inversion. Ship noise data were measured on a 16-element vertical line array in shallow water off the west coast of Vancouver Island. The data were filtered into low (70-110 Hz) and high (170-290 Hz) frequency bands, and processed in an inversion algorithm based on back propagation of the spectral components of the noise signal. The geoacoustic model that generated the most accurate focus at the source location was taken as the best estimate. The band limited data allowed estimation separately of geoacoustic model parameters of the sea floor with the high frequencies, and then for the deeper layers using the low frequencies. The estimated model parameters compared well with ground truth data from a seismic survey and from sediment samples at the siteinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.68 n.2 suppl.TIProc 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200020en10.4067/S0717-65382004000200020
institution	Scielo Chile
collection	Scielo Chile
language	English
description	Estimation of geoacoustic models of the sea bed is an underlying research issue in understanding acoustic propagation in shallow water environments where the propagation is generally bottom limited. Inversion methods based on matched field processing have become widely used in applications with experimental data at various sites worldwide. Traditionally, the experiments have been carried out with controlled source geometries. This paper presents a new experimental approach that makes use of the noise radiated by passing ships as the sound source for the inversion. Ship noise data were measured on a 16-element vertical line array in shallow water off the west coast of Vancouver Island. The data were filtered into low (70-110 Hz) and high (170-290 Hz) frequency bands, and processed in an inversion algorithm based on back propagation of the spectral components of the noise signal. The geoacoustic model that generated the most accurate focus at the source location was taken as the best estimate. The band limited data allowed estimation separately of geoacoustic model parameters of the sea floor with the high frequencies, and then for the deeper layers using the low frequencies. The estimated model parameters compared well with ground truth data from a seismic survey and from sediment samples at the site
author	Ross Chapman,N Dizaji,Reza M Lynn Kirlin,R
spellingShingle	Ross Chapman,N Dizaji,Reza M Lynn Kirlin,R INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
author_facet	Ross Chapman,N Dizaji,Reza M Lynn Kirlin,R
author_sort	Ross Chapman,N
title	INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
title_short	INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
title_full	INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
title_fullStr	INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
title_full_unstemmed	INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
title_sort	inversion of geoacoustic model parameters using ship noise
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200020
work_keys_str_mv	AT rosschapmann inversionofgeoacousticmodelparametersusingshipnoise AT dizajirezam inversionofgeoacousticmodelparametersusingshipnoise AT lynnkirlinr inversionofgeoacousticmodelparametersusingshipnoise
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INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE

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