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dc.contributor.advisorBourke, Robert H.
dc.contributor.advisorWilson, James H.
dc.contributor.authorCrouch, James A. M
dc.dateJune 1997
dc.date.accessioned2012-08-09T19:24:17Z
dc.date.available2012-08-09T19:24:17Z
dc.date.issued1997-06
dc.identifier.urihttp://hdl.handle.net/10945/9082
dc.description.abstractThe goal of this research was to investigate the performance of low frequency passive sonars in the Arafura Sea. Sound speed profiles representative of the wet and dry monsoon seasons and geoacoustic data were inputted into a finite element primitive equation transmission loss model to model the expected propagation at three frequencies, 10, 50 and 300 Hz. Initial detection ranges for several source/receiver depth combinations and geoacoustic areas (deep/ shallow water) were compared and evaluated. Results demonstrate that low frequency ( -10 Hz) detection ranges suffer due to cutoff frequency problems and to surface-decoupling loss. Propagation in deep water has the added disadvantage of excessive loss of signal power due to spherical spreading considerations. Conversely, higher frequencies (300 Hz) provided extended detection ranges in shallow water due to trapping of energy within the entire 50 m to 100 m water column. Additionally, investigation into advantages to be gained through advanced signal processing techniques shows that improvements of the order of 10 to 15 dB of detection gain are possible through the utilization of inverse beamforming.en_US
dc.description.urihttp://archive.org/details/towedarrayperfor00crou
dc.language.isoeng
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsCopyright is reserved by the copyright owneren_US
dc.subject.lcshOceanographic dataen_US
dc.titleTowed array performance in the littoral waters of Northern Australiaen_US
dc.typeThesisen_US
dc.contributor.corporateNaval Postgraduate School
dc.contributor.departmentOceanography
dc.subject.authorOceanographyen_US
dc.subject.authorPassive sonaren_US
dc.subject.authorInitial detection rangesen_US
dc.subject.authorArafura Seaen_US
dc.subject.authorBeamformingen_US
dc.description.serviceLieutenant, Royal Australian Navyen_US
etd.thesisdegree.nameM.S. in Physical Oceanographyen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplinePhysical Oceanographyen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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