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Beamforming when the sound velocity is not precisely known

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dc.contributorVirginia Tech. Department of Economicsen
dc.contributor.authorHinich, Melvin J.en
dc.contributor.departmentEconomicsen
dc.date.accessed2015-05-12en
dc.date.accessioned2015-05-26T20:30:30Zen
dc.date.available2015-05-26T20:30:30Zen
dc.date.issued1980-08en
dc.description.abstractBeamforming is an integral part of most signal processingsystems in active or passive sonars. The delays used to generate a beam are functions of the sound velocity, which depends on temperature, salinity, and pressure. There is a loss in array gain if the delays are incorrectly set. This will occur when the sound velocity in the water surrounding the hydrophones is different from the velocity that was used to set the delays. This paper makes two points: (1) fixed delay line sonars suffer a loss in gain when the true sound speed in the water is different from the velocity that is used to set the delays, and (2) there are signal processing techniques for two- or three-dimensional arrays that yield source bearings that are independent of the true sound velocity. These techniques require variable time delays, which can be realized using digital processing.en
dc.description.sponsorshipNaval Coastal Systems Center (U.S.). Sonar and Torpedo Countermeasures Block Program - SF 34371691en
dc.description.sponsorshipUnited States Office of Naval Research. Statistics and Probability Programen
dc.format.extent4 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationHinich, M. J. (1980). Beamforming when the sound velocity is not precisely known. Journal of the Acoustical Society of America, 68(2), 512-515. doi: 10.1121/1.384763en
dc.identifier.doihttps://doi.org/10.1121/1.384763en
dc.identifier.issn0001-4966en
dc.identifier.urihttp://hdl.handle.net/10919/52605en
dc.identifier.urlhttp://scitation.aip.org/content/asa/journal/jasa/68/2/10.1121/1.384763en
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAcoustic wave velocityen
dc.subjectAcoustic beamformingen
dc.subjectSignal processingen
dc.subjectSonaren
dc.subjectMicrophonesen
dc.titleBeamforming when the sound velocity is not precisely knownen
dc.title.serialJournal of the Acoustical Society of Americaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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