Marine radar properties, analysis and applications
ForfatterKaspersen, Kai Magne
In this thesis marine radars are compared with synthetic aperture radars (SAR) and the possibility of cross-over applications are investigated. A first cross-over has been demonstrated by using the TS-CFAR on marine radar images. The TS-CFAR was originally developed for SAR and is a constant false alarm rate (CFAR) detection algorithm based on truncated statistics. Detecting weak targets embedded in sea clutter is difficult because it is hard to find a model describing the sea in its various conditions. For detection algorithms such as constant false alarm rate (CFAR) the accuracy of the sea clutter estimation directly relates to performance. A model comparison between Weibull-, Gamma-, Log-normal- and Rayleigh PDF on sea clutter data has been performed. Sea clutter data was separated at sectors at different range, and both low- and high resolution data from a X-band Sea-Hawk radar and S-band JRC JMR solid state radar was used in the comparison. Our results show that the Weibull PDF models the sea clutter best in most cases, but we found indications that the Gamma PDF fit the clutter best when texture is present. The TS-CFAR was compared to a CA-CFAR both with an underlying Weibull model and an underlying Gamma model. Our results show that TS-CFAR clearly performed best on high resolution data and for multiple target situations. This thesis also shows how to extract raw data from marine radars which proved to be a formidable task.
ForlagUiT The Arctic University of Norway
UiT Norges arktiske universitet
MetadataVis full innførsel
Følgende lisensfil er knyttet til denne innførselen:
Viser innførsler relatert til tittel, forfatter og emneord.
Innovation and commercialization potential of university-developed arctic ice-tethered platforms. A case study of research-based technology Agwu, Ukeje Jacob; Logvinovskaya, Anna; Phetchpinkaew, Gorn (Master thesis; Mastergradsoppgave, 2017-05-31)The Arctic is a region which is rapidly opening up for business opportunities. However, research has been abundant here for a long time. With this situation comes the avenue to transition technology used in the region from research to commercial purposes. In this thesis, a business case is developed to show the commercial potential of research-based technology. The case technology was developed by ...
Marin forsøpling. Hvilke regler gjelder med formål å forhindre primærmikroplastforsøpling i norske kyst-og havområder Slungård, Andrea Øiahals (Master thesis; Mastergradsoppgave, 2016-05-03)Masteroppgaven omhandler primær mikroplastforsøpling som følge av norsk bruk eller virksomhet og tar utgangspunkt i forsøplingskildene av primær mikroplast som er kosmetikk, gummigranulat fra idrettsbaner og utilsiktet utslipp fra plastindustrien. Marin forsøpling, herunder primær mikroplastforsøpling betegnes om de bearbeidede og prosesserte faste stoffer som havner i kyst og havområdene Primær ...
On the use of the HUGIN 1000 HUS Autonomous Underwater Vehicle for high resolution zooplankton measurements Pedersen, Ole Petter; Gaardsted, Frank; Lågstad, Petter Arthur; Tande, Kurt Steinar (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)This paper evaluates and tests the HUGIN 1000 HUS AUV as a carrier platform for the Laser Optical Plankton Counter (LOPC). The LOPC was mounted outside on top of the carrier platform, and the tests confirm that this concept did not create turbulence and zooplankton avoidance. A negligible velocity difference between the flow passing through the sampling tube and the AUV speed was detected. The ...