| dc.date.accessioned | 2021-06-28T13:03:25Z | |
| dc.date.available | 2021-06-28T13:03:25Z | |
| dc.date.issued | 2021 | |
| dc.identifier.uri | http://hdl.handle.net/10852/86488 | |
| dc.description.abstract | Synthetic aperture sonar (SAS) is a technique for acoustic imaging and mapping of the seafloor. SAS systems are typically operated from autonomous underwater vehicles in a side-looking configuration. They can provide images with resolution down to a few centimeters out to a range of several hundred meters. The high resolution is obtained through the SAS processing, where measurements recorded at different positions are combined coherently by accounting for the vehicle navigation.
In this work I investigate the information collected by SAS systems that is not expressed directly in the SAS intensity images. This includes information that can be used to refine the navigation solution for the AUV, and information on physical properties that can support the detection and classification of objects of interest. I establish the spatial coherence of speckle for SAS systems, and use this to obtain successful repeat-pass SAS micro-navigation updates with ten times the track separation reported in earlier studies. I establish the support and quality of frequency- and aspect-dependent information for SAS systems, and improve interferometric depth estimates by incorporating the frequency-dependent data quality. I extract information on aspect-dependent scattering from objects on the seafloor, and develop a calibration target for extraction of the frequency dependency. | en_US |
| dc.language.iso | en | en_US |
| dc.relation.haspart | Paper I Sæbø, T. O., Synnes, S. A. V., and Hansen, R. E. (2013). “Wideband interferometry in synthetic aperture sonar”. In: IEEE Transactions on Geoscience and Remote Sensing vol. 51, no. 8, pp. 4450–4459 An author version is included in the thesis. The published version is available at: https://doi.org/10.1109/TGRS.2013.2244900 | |
| dc.relation.haspart | Paper II Synnes, S. A. V., Hunter, A. J., Hansen, R. E., Sæbø, T. O., Callow, H. J., Vossen, R. van, and Austeng, A. (2017). “Wideband synthetic aperture sonar backprojection with maximization of wave number domain support”. In: IEEE Journal of Oceanic Engineering vol. 42, no. 4, pp. 880–891 An author version is included in the thesis. The published version is available at: https://doi.org/10.1109/JOE.2016.2614717 | |
| dc.relation.haspart | Paper III Synnes, S. A. V. and Hansen, R. E. (2015). “Aspect-dependent scattering in widebeam synthetic aperture sonar”. In: Proceedings of the 3rd Underwater Acoustics Conference and Exhibition (UACE). Chania, Crete, Greece, pp. 129– 136 An author version is included in the thesis. | |
| dc.relation.haspart | Paper IV Synnes, S. A. V. and Lorentzen, O. J. (2019). “Calibration target for estimation of frequency dependence in synthetic aperture sonar”. In: Proceedings of the 5th Underwater Acoustics Conference and Exhibition (UACE). Hersonissos, Crete, Greece, pp. 147–154 An author version is included in the thesis. | |
| dc.relation.haspart | Paper V Synnes, S. A. V., Hansen, R. E., and Sæbø, T. O. (2021). “Spatial coherence of speckle for repeat-pass synthetic aperture sonar micronavigation”. In: IEEE Journal of Oceanic Engineering (Eary Access), pp. 1–16 An author version is included in the thesis. The published version is available at: https://doi.org/10.1109/JOE.2021.3060812 | |
| dc.relation.uri | https://doi.org/10.1109/TGRS.2013.2244900 | |
| dc.relation.uri | https://doi.org/10.1109/JOE.2016.2614717 | |
| dc.relation.uri | https://doi.org/10.1109/JOE.2021.3060812 | |
| dc.title | Advanced Processing for Synthetic Aperture Sonar | en_US |
| dc.type | Doctoral thesis | en_US |
| dc.creator.author | Synnes, Stig Asle Vaksvik | |
| dc.identifier.urn | URN:NBN:no-89124 | |
| dc.type.document | Doktoravhandling | en_US |
| dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/86488/1/Phd-Synnes.pdf | |