Searched for: subject%3A%22Towed%255C%2Barrays%22
(1 - 12 of 12)
document
von Benda-Beckmann, A.M. (author), Lam, F.P.A. (author), Moretti, D.J. (author), Fulkerson, K. (author), Ainslie, M.A. (author), van IJsselmuide, S.P. (author), Theriault, J. (author), Beerens, S.P. (author), TNO Defensie en Veiligheid (author)
The detection performance of a towed hydrophone array for deep-diving species is quantified by comparing detections of echolocation clicks from foraging groups of Blainville’s beaked whales (Mesoplodon densirostris) from the TNO Delphinus array to detections from bottom-mounted hydrophones at the Atlantic Undersea Test and Evaluation Center ...
article 2010
document
Sheldon-Robert, M.K. (author), Beerens, S.P. (author), Lam, F.P.A. (author), TNO Defensie en Veiligheid (author)
To protect marine mammals from potential negative impacts of high-power sound from tactical sonar, the use of passive acoustic monitoring prior and during sonar exercises is a possible non-intrusive solution for the monitoring requirements for naval forces. Particularly deep-diving beaked whales seem sensitive to sound from tactical mid...
conference paper 2008
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Ainslie, M.A. (author), van Walree, P.A. (author), Boek, W. (author), TNO Defensie en Veiligheid (author)
The performance of a sonar system operating in shallow water is closely linked to the properties of the seabed. At the same time the sensitivity of the acoustic signal (or background) to sediment properties gives an acoustic sensor the potential to measure precisely those properties that are needed to estimate sonar performance. Of particular...
conference paper 2007
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Kromjongh, J. (author), van Spellen, M. (author), Beerens, S.P. (author), van IJsselmuide, S.P. (author), TNO Defensie en Veiligheid (author)
World-wide a concern exists about the influence of man-made sound on marine life and particularly on marine mammals. One of the acoustic polluters of the world’s oceans is high-power active sonar. An early warning system at the sound source, which is based on passive detection of marine mammals, could avoid exposure of marine mammals to...
conference paper 2005
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Colin, M.E.G.D. (author), Groen, J. (author), Quesson, B.A.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Although Low Frequency Active Sonar (LFAS) is considered one of the best means of detection and localization of a submarine in shallow water, the use of an active system is not always possible for tactical reasons. It is therefore interesting to include a passive mode in these systems by using the receiving array as a passive array. However,...
conference paper 2004
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Groen, J. (author), Beerens, S.P. (author), Doisy, Y. (author), TNO Fysisch en Elektronisch Laboratorium (author)
ASW operations have shifted toward shallow water environments, where water space is limited and manoeuvring an essential part of operations. The problem that is tackled in this article is the performance loss due to the shape and motion of a manoeuvring sonar. Standard beamforming in towed sonar arrays is based on the assumption that all...
conference paper 2004
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Beerens, S.P. (author), van IJsselmuide, S.P. (author), van Koersel, A.C. (author), TNO Fysisch en Elektronisch Laboratorium (author)
In the current sensor suites on board submarines the Passive Ranging Sonar (PRS) is a separate sensor, usually with three or more hydrophone groups on either side of the submarine. The aperture of this sensor is limited by the length of the boat, which makes ranging up to moderate distances possible. The combination of the towed and flank array...
conference paper 2003
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Colin, M.E.G.D. (author), Groen, J. (author), TNO Fysisch en Elektronisch Laboratorium (author)
An important issue in research on passive ASW operations is improvement in signal-to-noise ratio (SNR) and bearing resolution for targets emitting low frequency signals. One of the techniques believed to improve these characteristics is Synthetic Aperture Sonar (SAS). The method is based on the artificial enlargement of a sonar array by...
conference paper 2002
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Colin, M.E.G.D. (author), Groen, J. (author)
An important issue in research on passive ASW operations is improvement in signal-to-noise ratio (SNR) and bearing resolution for targets emitting low frequency signals. One of the techniques believed to improve these characteristics is Synthetic Aperture Sonar (SAS). The method is based on the artificial enlargement of a sonar array by...
conference paper 2002
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TNO Fysisch en Elektronisch Laboratorium (author), Beerens, S.P. (author), van IJsselmuide, S.P. (author)
In the design of towed array sonar receivers the reduction of flow-induced noise is an important issue. In this paper theory on flow noise and several methods to analyse flow noise are presented. These methods are applied to sea trial data of an experimental triplet array. The obtained results agree well with accepted theory. It appears that the...
article 2002
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Beerens, S.P. (author), van IJsselmuide, S.P. (author), Volwerk, C. (author), Trouve, E. (author), Doisy, Y. (author), TNO Fysisch en Elektronisch Laboratorium (author)
In the design of towed array sonar the reduction of flow noise is an important issue. In this paper flow noise theory and several methods to analyse flow noise are presented. These methods are applied to sea trial data of an experimental triplet array. The obtained results agree very well with accepted theory. It appears that the methods in...
conference paper 1999
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Been, R. (author), TNO Fysisch en Elektronisch Laboratorium (author)
At the TNO Physics and Electronics Laboratory (TNO-FEL), for a number of decades, the behaviour and performance of towed sonar systems has been studied extensively. Since the performance of towed sonars highly depends on the shape of the hydrophone array, the underwater acoustics group started performing research in this field in the 1980's....
conference paper 1996
Searched for: subject%3A%22Towed%255C%2Barrays%22
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