Browsing by Author "Eidem, Ellen Johanne"
Now showing items 1-12 of 12
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Acoustic seabed classification using QTC IMPACT on single-beam echo sounder data from the Norwegian Channel, northern North Sea
Eidem, Ellen Johanne; Landmark, Knut (2013)Sediment mapping is important for understanding the physical processes, the impact of human activity, and the conditions for marine life on the seabed. For this purpose, the seabed classification tool QTC IMPACT analyses ... -
Broadband inversion and source localization of vertical array data from the L-antenna experiment in 1999
Eidem, Ellen Johanne (2002)Matched field processing techniques have been demonstrated on vertical array data from the 1999 L-antenna experiment. Both single-frequency and broadband inversion of geoacoustic and geometric parameters were carried ... -
Correlation between sediment properties and seafloor characterization maps based on multibeam backscatter data from three regions off the coast of Norway
Eidem, Ellen Johanne (2017)Multibeam echo sounder data from Kongsberg EM 1002 and EM 710 (70– 100 kHz) acquired between 2003 and 2014 were processed using QPS Fledermaus Geocoder Toolbox (FMGT) to produce backscatter mosaics and maps of estimated ... -
Correlations between sound speed and density in seabed sediment cores collected in Norwegian waters
Eidem, Ellen Johanne; Kolstrup, Marianne Lanzky (2022-08-08)In modelling of underwater sound propagation, knowledge about the seabed’s acoustic properties is essential, especially sound speed and density. These two properties are highly correlated, and standard empirical regressions ... -
Improved active sonar tactical support by through-the-sensor estimation of acoustic seabed properties
Vossen, Robbert van; Eidem, Ellen Johanne; Ivansson, Sven; Chalindar, Bruno; Dybedal, Johnny; Colin, Mathieu; Benders, Frank; Andersson, Brodd Leif; Juhel, Bénédicte; Cristol, Xavier; Olsen, Geir-Kyrre; Pihl, Jörgen; Tveit, Elling; Jespers, Stephane; Ainslie, Michael (2014)Accurate environmental information is required for obtaining confident sonar performance predictions. This environmental information is, however, often unreliable or unavailable. To support antisubmarine warfare (ASW) ... -
Innsamling og beskrivelse av kjerneprøver og grabbprøver fra havbunnen i Forsvarets øvingsfelt i nordlige Nordsjøen 2004-2008
Eidem, Ellen Johanne; Landmark, Knut (2008)I forbindelse med oppmåling av havbunnen i Forsvarets øvingsfelt i den nordlige Nordsjøen har Forsvarets forskningsinstitutt (FFI) tatt 40 kjerneprøver og 37 grabbprøver for undersøkelser av havbunnens beskaffenhet. ... -
Measurements and analysis of fluctuations in the Earths magnetic field in a coastal water area - originally presented at Marelec 97, June 1997
Eidem, Ellen Johanne (2006)Forsvarets forskningsinstitutt accomplished in September 1991 a pilot study investigating fluctuations in the earth's magnetic field in a coastal water area in Norway. The experimental data was collected during seven days ... -
Project POSEIDON - cruise report from MS H.U. Sverdrup II during transit from Kristiansund to Tromsø September 2008 - a cooperative survey between the Geological Survey of Norway and the Norwegian Defence Resarch Establishment
Eidem, Ellen Johanne; Margaret, Dolan; Bjørneseth, Gisle J. (2008)The report describes the activities during a four-day transit and survey in September 2008 from Kristiansund to Tromsø. Since FFI’s research vessel M/S H.U. Sverdrup II was in transit from the Bergen area to the Barents ... -
Seabed classification of the Navy´s exercise area in the northern North Sea
Eidem, Ellen Johanne; Landmark, Knut (2008)The propagation of sound from ships, explosive charges and sonars is dependent on both topography and the geoacoustic properties of the seabed at low frequencies or in shallow waters. Information about the seabed is therefore ... -
Single shot inversion from the L-antenna experiment in 1999
Eidem, Ellen Johanne (2001) -
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 ... -
Tolkning av sedimentprøver fra Forsvarets øvingsfelt i nordlige Nordsjøen innsamlet 2004-2008
Eidem, Ellen Johanne (2008)I forbindelse med oppmåling av havbunnen i Forsvarets øvingsfelt i den nordlige Nordsjøen har Forsvarets forskningsinstitutt (FFI) tatt 40 kjerneprøver og 37 grabbprøver i årene 2004 – 2008 for undersøkelser av havbunnens ...