Using spread spectrum coded pings in active sonar technology

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buir.advisorKöymen, Hayrettin
dc.contributor.authorKumru, Yasin
dc.date.accessioned2016-01-08T18:27:51Z
dc.date.available2016-01-08T18:27:51Z
dc.date.issued2014
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and The Graduate School of Engineering and Science of Bilkent University, 2014.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2014.en_US
dc.descriptionIncludes bibliographical references leaves 66-68.en_US
dc.description.abstractPerformance of coded signals in active Sound Navigation and Ranging (SONAR) technology is studied in this work. In this work, the possibility of having covertness and environment friendliness in SONAR systems is investigated. Spread spectrum ping signal is considered to achieve low probability of detection and interception, while maintaining good performance. Direct Sequence Spread Spectrum (DSSS) coded transmitted signals having a sequence type of maximal with lengths from 7 chips to 127 chips and tone burst pulse having single length as a reference signal are used as spread spectrum ping signal. The length of the tone burst pulse can not be increased indefinitely because of the multipath propagation. The problem of detection and localization of the targets and the cross correlation properties of the maximal length sequences are investigated as well. The Signal to Noise Ratio (SNR) and Signal to Interference and Distortion ratio (SINAD) are important parameters in detection and localization of the targets. It is found that as the number of chip length increases, the SNR and SINAD increase but the improvement of the SINAD is comparatively less because of the cross correlation properties of the maximal length sequences.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityKumru, Yasinen_US
dc.format.extentxi, 68 leaves, graphicsen_US
dc.identifier.urihttp://hdl.handle.net/11693/15974
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectTarget Detection and Localizationen_US
dc.subjectCovertnessen_US
dc.subjectDirect Sequence Spread Spectrum Modulation (DSSS)en_US
dc.subjectMaximal Length Sequencesen_US
dc.subjectTone Burst Pulseen_US
dc.subjectSNRen_US
dc.subjectSINADen_US
dc.subject.lccTK5103.2 .K86 2014en_US
dc.subject.lcshUnderwater acoustics--Data processing.en_US
dc.subject.lcshSignal processing.en_US
dc.subject.lcshWireless sensor networks.en_US
dc.titleUsing spread spectrum coded pings in active sonar technologyen_US
dc.typeThesisen_US
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