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dc.contributor.authorRead, Robert R.
dc.date1990-09
dc.date.accessioned2013-04-29T23:28:13Z
dc.date.available2013-04-29T23:28:13Z
dc.date.issued1990-09
dc.identifier.urihttp://hdl.handle.net/10945/31892
dc.descriptionAn operational study has been made of algorithms employed in short base line underwater position location systems. Some important sources of systematic error have been uncovered. The issues studied include isospeed vs. isogradient ray tracing, effect of the depth velocity profile and water layer thickness, approximate vs. exact array tilt corrections, and ray tracing initialization methodology. It is shown that the practice of constant speed extrapolation of depth-velocity information can cause considerable mischief. The best remedy is to measure speed all the way to the bottom. It is further shown that the systematic errors are periodic functions of the azimuth direction of the sound ray from the receiver array. The amplitudes of these functions are greater for the more severely tilted arrays. An alternative algorithm is proposed that reduces these errors by at least an order of magnitude. Keywords: Ray tracing; Calibration; Underwater tracking; Short baseline systems; Systematic errors. (JHD)en_US
dc.description.abstractAn operational study has been made of the algorithms employed by the Naval Undersea Weapons Engineering Aviation in their short base line underwater position location systems. Some important sources of systematic error have been uncovered. The issues stuided include isospeed vs. isogradient ray tracing, effect of the depth velocity profile and water layer thickness, approximate vs. exact array tilt corrections, and ray tracing initialization methodology...en_US
dc.description.sponsorshipThis report was prepared under the joint support of Naval Undersea Warfare Engineering Station, Keyport, Washington and the Naval Postgraduate School Research Programen_US
dc.description.urihttp://archive.org/details/studyofunderwate51read
dc.format.extenti, 97 p. : ill. ; 28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.subject.lcshACOUSTIC TRACKINGen_US
dc.titleA study of underwater sound ray tracing methodologyen_US
dc.typeTechnical Reporten_US
dc.subject.authorRay tracingen_US
dc.subject.authorCalibrationen_US
dc.subject.authorUnderwater trackingen_US
dc.subject.authorShort baseline systemsen_US
dc.subject.authorSystematic errorsen_US
dc.identifier.oclca187333
dc.identifier.npsreportNPS55-90-21


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