Geoacoustic inversion in multiple source environments

dc.contributor.advisorKnobles, David P.
dc.contributor.advisorHamilton, Mark F.
dc.creatorRitterman, Eric Andrew
dc.date.accessioned2021-05-26T22:06:07Z
dc.date.available2021-05-26T22:06:07Z
dc.date.issued2004-05-22
dc.description.abstractThe sensitivity of geoacoustic inversion to noise corruption makes it difficult to implement a method to invert using ships of opportunity as sources because one cannot always assume a single source environment. Current methods to reject interfering signals in the inversion methodology are not adequate to suppress a loud interferer dominating a quiet source of interest. A spatial filtering method is tested on experimental data collected in the Gulf of Mexico in 1998. The filtering is intended to reject interfering signals while maintaining inversion sensitivity to geoacoustic parameters. The filter operates by rejecting unwanted signals incident on an array from different angles. It relies on a transformation of acoustic data from the element level into beam coefficients, which are then attenuated according to some desired filter response. These attenuated data are then transformed back to the element level. Several issues must be addressed in filter implementation: pseudo-inverse tolerance, sediment layering, and shallow angle contributions. Sensitivity of pseudo-inverse tolerance and shallow angle contributions increase when using arrays operating outside design frequency limits. However, even with sparsely sampled arrays, correct filter implementation can improve inversion results of a quiet source when in the presence of a loud interfereren_US
dc.description.departmentMechanical Engineeringen_US
dc.format.mediumelectronicen_US
dc.identifier.urihttps://hdl.handle.net/2152/86241
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/13192
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectGeoacoustic inversionen_US
dc.subjectSpatial filtering methoden_US
dc.subjectLoud interfereren_US
dc.titleGeoacoustic inversion in multiple source environmentsen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineMechanical Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science in Engineeringen_US
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