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dc.contributor.advisorHanssen, Alfred
dc.contributor.authorSæbø, Torstein Olsmo
dc.date.accessioned2010-10-29T08:16:30Z
dc.date.available2010-10-29T08:16:30Z
dc.date.issued2010-11-19
dc.description.abstractThe topic of this thesis is relative depth estimation using interferometric sidelooking sonar. We give a thorough description of the geometry of interferometric sonar and of time delay estimation techniques. We present a novel solution for the depth estimate using sidelooking sonar, and review the cross-correlation function, the cross-uncertainty function and the phase-differencing technique. We find an elegant solution to co-registration and unwrapping by interpolating the sonar data in ground-range. Two depth estimation techniques are developed: Cross-correlation based sidescan bathymetry and synthetic aperture sonar (SAS) interferometry. We define flank length as a measure of the horizontal resolution in bathymetric maps and find that both sidescan bathymetry and SAS interferometry achieve theoretical resolutions. The vertical precision of our two methods are close to the performance predicted from the measured coherence. We study absolute phase-difference estimation using bandwidth and find a very simple split-bandwidth approach which outperforms a standard 2D phase unwrapper on complicated objects. We also examine advanced filtering of depth maps. Finally, we present pipeline surveying as an example application of interferometric SAS.en
dc.description.consentN/Aen
dc.description.doctoraltypeph.d.en
dc.description.publishchoiceen
dc.description.sponsorshipForsvarets forskningsinstitutt (FFI)en
dc.format.extent9489813 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.nb-fulltextFulltext http://www.ub.uit.no/munin/bitstream/10037/2793/3/thesis.pdf
dc.identifier.nb-urnURN URN:NBN:no-uit_munin_2531
dc.identifier.urihttp://hdl.handle.net/10037/2793
dc.identifier.urnURN:NBN:no-uit_munin_2531
dc.language.isoengen
dc.publisherUniversitetet i Tromsøen
dc.publisherUniversity of Tromsøen
dc.subject.courseIDDOKTOR-004nor
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering, visualisering, signalbehandling, bildeanalyse: 429en
dc.subjectVDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation, visualization, signal processing, image processing: 429en
dc.titleSeafloor depth estimation by means of interferometric synthetic aperture sonaren
dc.typeDoctoral thesisen
dc.typeDoktorgradsavhandlingen


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