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dc.contributor.authorChandrayadula, Tarun K.
dc.contributor.authorWage, Kathleen E.
dc.contributor.authorWorcester, Peter F.
dc.contributor.authorDzieciuch, Matthew A.
dc.contributor.authorMercer, James A.
dc.contributor.authorAndrew, Rex K.
dc.contributor.authorHowe, Bruce M.
dc.dateOctober 2013
dc.date.accessioned2016-04-13T20:50:08Z
dc.date.available2016-04-13T20:50:08Z
dc.date.issued2013-10
dc.identifier.citationJ. Acoust. Soc. Am., Vol. 134, No. 4, Pt. 2 (October 2013) p. 3332-3346en_US
dc.identifier.urihttp://hdl.handle.net/10945/48356
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1121/1.4818847en_US
dc.description.abstractMode travel time estimation in the presence of internal waves (IWs) is a challenging problem. IWs perturb the sound speed, which results in travel time wander and mode scattering. A standard approach to travel time estimation is to pulse compress the broadband signal, pick the peak of the compressed time series, and average the peak time over multiple receptions to reduce variance. The peak-picking approach implicitly assumes there is a single strong arrival and does not perform well when there are multiple arrivals due to scattering. This article presents a statistical model for the scattered mode arrivals and uses the model to design improved travel time estimators. The model is based on an Empirical Orthogonal Function (EOF) analysis of the mode time series. Range-dependent simulations and data from the Long-range Ocean Acoustic Propagation Experiment (LOAPEX) indicate that the modes are represented by a small number of EOFs. The reduced-rank EOF model is used to construct a travel time estimator based on the Matched Subspace Detector (MSD). Analysis of simulation and experimental data show that the MSDs are more robust to IW scattering than peak picking. The simulation analysis also highlights how IWs affect the mode excitation by the source.en_US
dc.description.sponsorshipOffice of Naval Research (ONR) grants N00014-03-1-0181 and N00014-03-1-0182en_US
dc.description.sponsorshipONR Graduate Traineeship Award N00014-06-1-0223en_US
dc.description.sponsorshipNational Research Council Research Associateship Awarden_US
dc.description.sponsorshipOffice of Naval Research (ONR) Award N00014-12-1-0412en_US
dc.format.extent15 p.en_US
dc.publisherAcoustical Society of Americaen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleReduced rank models for travel time estimation of low order mode pulsesen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentOceanographyen_US
dc.description.funderOffice of Naval Research (ONR) grants N00014-03-1-0181 and N00014-03-1-0182en_US
dc.description.funderONR Graduate Traineeship Award N00014-06-1-0223en_US
dc.description.funderNational Research Council Research Associateship Awarden_US
dc.description.funderOffice of Naval Research (ONR) Award N00014-12-1-0412en_US


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