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dc.contributor.advisorSmith, Kevin B.
dc.contributor.authorWeatherly, Kirk A.
dc.date.accessioned2012-08-09T18:47:34Z
dc.date.available2012-08-09T18:47:34Z
dc.date.issued2000-06-01
dc.identifier.urihttp://hdl.handle.net/10945/7686
dc.description.abstractThis thesis examines two implementations of the parabolic equation approximation to the acoustic wave equation aimed at removing three errors inherent to the wide-angle parabolic equation (WAPE) model. First, the selection of the range step size used by the split-step Fourier algorithm affects the convergence of the solution. Second, in certain ocean environments WAPE incorrectly computes the down-range transmission loss. Finally, WAPE does not reproduce the standard normal mode basis set as defined by normal mode theory. A double-precision implementation of the WAPE (DP-WAPE) is developed to evaluate the dependence of solution convergence on the numerical precision of the model. Finally, an implementation that is insensitive to the choice of the reference sound speed (COIPE) is evaluated for its ability to reduce or remove the latter two of these three errors. The stability other WAPE solution was found to be unaffected by the DP-WAPE implementation. The range-step dependence is inherent to the split-step algorithm. The COIPE corrects the transmission loss anomaly and satisfactorily reproduces the standard normal mode basis seten_US
dc.description.urihttp://archive.org/details/evaluationofimpr109457686
dc.format.extentviii, 87 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.titleEvaluation of improvements to an underwater acoustic propagation model based on the parabolic equationen_US
dc.typeThesisen_US
dc.contributor.secondreaderSanders, James V.
dc.subject.authorUnderwater Acoustic Propagationen_US
dc.subject.authorParabolic Equation Approximationen_US
dc.subject.authorModal Decompositionen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Engineering Acousticsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineEngineering Acousticsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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