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dc.contributor.advisorLing, Haoen
dc.contributor.advisorStory, Marken
dc.creatorClark, Jonathan Michaelen
dc.date.accessioned2016-07-01T16:46:55Z
dc.date.available2016-07-01T16:46:55Z
dc.date.issued2016-05en
dc.date.submittedMay 2016
dc.identifierdoi:10.15781/T2P26Q365en
dc.identifier.urihttp://hdl.handle.net/2152/38784en
dc.description.abstractIn this work, an eigenray finding method for simulating refractive multipath phenomena in an unbounded underwater environment is presented. To simplify the problem, the environment consists of a horizontally-homogeneous two-layer medium in which isogradient sound speed profiles are used in each layer. Eigenrays are found through an iterative Newton-Raphson method on the Snell invariant, and the travel time is found from the computed Snell invariant. A derivation for the maximum number of ray paths that need to be considered to account for all refractive multipaths is included. Given a point source/point target pair, the method will output a launch angle and travel time for the eigenray connecting the source and target. The time accuracy of the eigenray finding method is confirmed using a forward ray-trace. From the travel time of eigenrays, time series data is formed for each receive element. Refractive multipath phenomena are shown using the time series data of a target near the layer boundary. An FFT beamformer is used to beamform the simulated time series data which reproduces an image of the acoustic targets, which shows a time resolution sufficient to support the coherent addition of signals in beamforming.en
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.subjectUnderwater acousticsen
dc.subjectSonaren
dc.subjectRay theoryen
dc.subjectEigenrayen
dc.subjectEigenray findingen
dc.titleEigenray sonar simulation in two-layer mediaen
dc.typeThesisen
dc.date.updated2016-07-01T16:46:55Z
dc.description.departmentElectrical and Computer Engineeringen
thesis.degree.departmentElectrical and Computer Engineeringen
thesis.degree.disciplineElectrical and Computer engineeringen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Science in Engineeringen
dc.creator.orcid0000-0003-4744-9609en
dc.type.materialtexten


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