Seafloor depth estimation by means of interferometric synthetic aperture sonar

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Seafloor depth estimation by means of interferometric synthetic aperture sonar

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dc.contributor.advisor Hanssen, Alfred Sæbø, Torstein Olsmo 2010-10-29T08:16:30Z 2010-10-29T08:16:30Z 2010-11-19
dc.description.abstract The 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.
dc.description.doctoraltype ph.d.
dc.description.sponsorship Forsvarets forskningsinstitutt (FFI)
dc.format.extent 9489813 bytes
dc.format.mimetype application/pdf
dc.identifier.urn URN:NBN:no-uit_munin_2531
dc.language.iso eng
dc.publisher Universitetet i Tromsø
dc.publisher University of Tromsø
dc.subject.courseID DOKTOR-004
dc.subject VDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering, visualisering, signalbehandling, bildeanalyse: 429
dc.subject VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation, visualization, signal processing, image processing: 429
dc.title Seafloor depth estimation by means of interferometric synthetic aperture sonar
dc.type Doctoral thesis
dc.type Doktorgradsavhandling

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