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dc.contributor.advisorLarraza, Andrés
dc.contributor.advisorSmith, Kevin B.
dc.contributor.authorHeinemann, Michael Gerhard
dc.date.accessioned2012-08-09T18:47:38Z
dc.date.available2012-08-09T18:47:38Z
dc.date.issued2000-03
dc.identifier.urihttp://hdl.handle.net/10945/7697
dc.description.abstractThe most difficult problem in shallow underwater acoustic communications is considered to be the time-varying multipath propagation because it impacts negatively on data rates. Computationally intensive and complex signal processing algorithms are required to compensate for symbol overlapping. This thesis presents results of a tank scale experiment to test Time-Reversal Acoustics (TRA) approach for high data rate binary transmissions. TRA can environmentally adapt the acoustic propagation effects of a complex medium. Our results show the suitability of the TRA approach in underwater acoustic communications. The results also show good focusing properties at an intended target location. The focal region extends over a few wavelengths, outside of which scrambling of the message occurs, offering natural encryption. Range shifts of the focal region could be achieved by frequency shifting. We found that the time focusing is aperture-size independent, but the spatial focusing is aperture-size dependent. Overall, we showed that our algorithm can accomplish a fast, secure, and stable communication scheme with low computational complexityen_US
dc.description.urihttp://archive.org/details/experimentalstud109457697
dc.format.extentx, 62 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.titleExperimental studies of applications of time-reversal acoustics to non-coherent underwater communicationsen_US
dc.typeThesisen_US
dc.subject.authorTime reversal acousticsen_US
dc.subject.authorAcoustic communicationsen_US
dc.subject.authorAcoustic signal processingen_US
dc.description.serviceKapitänleutnant, German Navyen_US
etd.thesisdegree.nameM.S. in Engineering Acousticsen_US
etd.thesisdegree.nameM.S. in Applied Physicsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineEngineering Acousticsen_US
etd.thesisdegree.disciplineApplied Physicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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