Browsing Rapporter by Author "Tollefsen, Dag"
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Forsvaret i verdensrommet
Hofoss, Espen; Aarønæs, Lars; Abrahamsen, Trond; Tollefsen, Dag (2023-06)Rommet gir Forsvaret store teknologiske og strategiske muligheter – først og fremst innenfor kommunikasjon, navigasjon og overvåking. I dette magasinet kan du lese mer om disse mulighetene, og hva som må til for at vi ... -
Geoacoustic inversion on the continental shelf - layered elastic seabeds
Tollefsen, Dag (2002)The prediction of passive low-frequency sonar conditions in shallow water requires knowledge of the composition and geoacoustic parameters of the seabed. Seabed geoacoustic parameters can be estimated by inversion of ... -
Matched-field localization of explosive sources in the Barents Sea using a horizontal array
Tollefsen, Dag (2002)Matched-field processing (MFP) techniques are used to estimate the range and depth of underwater explosive sources. Data from an experiment conducted by FFI in the Barents Sea 1999 is used. The experiment was conducted ... -
Range-dependent geoacoustic inversion using the parabolic equation and genetic algorithms - application to GAIT test cases
Tollefsen, Dag (2006)Rapid in-situ assessment of sonar conditions in shallow water is an area of interest for military applications. The goal is through-the-sensor techniques that collect acoustic data from sonar, infer the relevant ocean ... -
Seabed characterization with a small towed array - simulation of system design facors
Tollefsen, Dag (2013-07-01)This report studies design factors for a small activated towed-array system for use in seabed characterization. By seabed characterization is here meant the estimation of geo-acoustic parameters including sound speed, ... -
Summary report on analysis of acoustic data from the SWASI-99 array experiment
Eidem, Ellen Johanne; Jenserud, Trond; Søstrand, Knut A.; Tollefsen, Dag (2003)The localization of underwater acoustic sources in a shallow water environment is addressed. Two array signal processing methods suitable for low-frequency signals in shallow water have been applied to data from an ...