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Doisy, Y. (author), Deruaz, L. (author), van IJsselmuide, S.P. (author), Beerens, S.P. (author), Been, R. (author), TNO Defensie en Veiligheid (author)Abstract—The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999. The aim of the trials was to compare the performance of...article 2008
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Groen, J. (author), Beerens, S.P. (author), Been, R. (author), Doisy, Y. (author), TNO Defensie en Veiligheid (author)Abstract—For a low-frequency active sonar (LFAS) with a triplet receiver array, it is not clear in advance which signal processing techniques optimize its performance. Here, several advanced beamformers are analyzed theoretically, and the results are compared to experimental data obtained in sea trials. Triplet arrays are single line arrays with...article 2005
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van IJsselmuide, S.P. (author), Deruaz, L. (author), Been, R. (author), Doisy, Y. (author), Beerens, S.P. (author), TNO Fysisch en Elektronisch Laboratorium (author)For littoral ASW, reverberation is a big problem and rejection of reverberation is of utmost importance. The influence of the transmitted signal on the signal to reverberation ratio has been presented in three preceding papers. In this paper, the influence of improved signal processing on the receiver side is investigated. It is known that low...conference paper 2002
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Doisy, Y. (author), Deruaz, L. (author), Beerens, S.P. (author), Been, R. (author), TNO Fysisch en Elektronisch Laboratorium (author)The topic of this paper is the design and performance analysis of wideband sonar waveforms capable of estimating both target range and Döppler using as few replicas in the processing as possible. First, it is shown that for conventional Döppler sensitive waveforms, for which the Döppler and delay are uncoupled, the Döppler accuracy is...article 2000
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Doist, Y. (author), Deruz, L. (author), Been, R. (author), TNO Fysisch en Elektronisch Laboratorium (author)The influence of the waveform of the transmitted signal on the signal to reverberation ratio induced at the processing output of a moving sonar array is analysed on an theoretical basis. Three main classes of signals are analysed: wide band signals with a flat spectrum (for instance FM signals), continuous wave signals and wide band signals with...conference paper 2000
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Doisy, Y. (author), Deruaz, L. (author), Prunel, B. (author), Been, R. (author), Beerens, S.P. (author), van IJsselmuide, S.P. (author), TNO Fysisch en Elektronisch Laboratorium (author)The influence of the waveform of the transmitted signal on the signal to reverberation ratio of a moving sonar array is analysed on an experimental basis. Experiments have been conducted during sea-trials in shallow water environments in September 98 and October 99. The aim of the trials was to compare the performance of three waveforms:...conference paper 2000
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Beerens, S.P. (author), Been, R. (author), Groen, J. (author), Noutary, E. (author), Doisy, Y. (author), TNO Fysisch en Elektronisch Laboratorium (author)Triplet arrays are single line arrays with three hydrophones on a circular section of the array. The triplet structure provides immediate port-starboard (PS) discrimination. This paper discusses the theoretical and experimental performance of triplet arrays. Results are obtained on detection gain and PS discrimination in several environmental...conference paper 2000
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Volwerk, C. (author), Been, R. (author), Kromjongh, J. (author), Jarvis, A.K. (author), TNO Fysisch en Elektronisch Laboratorium (author)Quieter targets imply longer sonar arrays for improved detection performance. Straight-line assumptions in the beamforming process are no longer valid and it becomes important to know the actual hydrophone positions. Knowing the shape and attitude of a hydrophone array with sufficient accuracy enables correction of the beamwidth and sidelobe...conference paper 2000
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Been, R. (author), Beerens, S.P. (author), van IJsselmuide, S.P. (author), Prunel, B. (author), TNO Fysisch en Elektronisch Laboratorium (author)The influence of the waveform of the transmitted signal on the signal to reverberation ratio of a moving sonar array is analysed on an experimental basis. Experiments were conducted during sea-trials in shallow water areas in September 98 and October 99. The aim of the trials was to compare the performance of three waveforms: frequency modulated...conference paper 2000
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- TNO Fysisch en Elektronisch Laboratorium (author), Ort, C.M. (author), Saanen, A.M.G.H. (author), Driessen, F.P.G. (author), Simons, D.G. (author), Been, R. (author) article 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
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van Aartsen, C.S. (author), Been, R. (author), TNO Fysisch en Elektronisch Laboratorium (author)TNO Physics and Electronics Laboratory (TNO-FEL) research in the field of shape and attitude modelling of towed arrays has been carried out for many years. The final aim is to perform corrected beamforming in real-time. An overview of the present status of research in the field is presented. At first, the work on array shape esgtimation...conference paper 1995