Searched for: author%3A%22Zampolli%2C+M.%22
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Fillinger, L. (author), Hunter, A.J. (author), Zampolli, M. (author), Clarijs, M.C. (author)
Divers, including closed circuit (rebreather) divers constitute a potential threat to waterside infrastructures. Active diver detection sonars are available commercially but present some shortcomings, particularly in highly reverberant environments. This has led to research on passive sonar for diver detection. Passive detection of open-circuit...
conference paper 2013
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Zampolli, M. (author), Nijhof, M.J.J. (author), de Jong, C.A.F. (author), Ainslie, M.A. (author), Jansen, E.H.W. (author), Quesson, B.A.J. (author)
The acoustic radiation from a pile being driven into the sediment by a sequence of hammer strikes is studied with a linear, axisymmetric, structural acoustic frequency domain finite element model. Each hammer strike results in an impulsive sound that is emitted from the pile and then propagated in the shallow water waveguide. Measurements from...
article 2013
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van Vossen, R. (author), Quesson, B.A.J. (author), Beckers, A.L.D. (author), Zampolli, M. (author), Colin, M.E.G.D. (author), Hunter, A.J. (author)
Naval mines, underwater improvised explosive devices (UW-IEDs), and underwater unexploded ordnance (UW-UXO) are concerns for harbour security. In conditions without burial, existing commercial systems, such as the REMUS unmanned underwater vehicle equipped with a (very) high frequency side scan sonar (900/1800 kHz), may be deployed for detection...
conference paper 2012
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Hunter, A.J. (author), Fillinger, L. (author), Zampolli, M. (author), Clarijs, M.C. (author)
A PHD particle filter implementation has been detailed for the fusion of measurements from multiple passive sonar nodes. It has been demonstrated on simulated metadata and on experimental passive acoustic data of divers and small boats collected in an operational port environment. Fusion at the metadata level lowers the necessary data bandwidth,...
conference paper 2012
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Hunter, A.J. (author), Fillinger, L. (author), Zampolli, M. (author), Clarijs, M.C. (author)
Surveillance of waterside locations for protection against threats from small fast surface vessels and underwater intruders is a very relevant but challenging problem. For this reason, the Netherlands Organisation for Applied Scientific Research (TNO) is developing SOBEK – a family of passive sonar technologies for waterside surveillance. The...
conference paper 2012
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Hunter, A.J. (author), van Vossen, R. (author), Quesson, B.A.J. (author), Colin, M.E.G.D. (author), Zampolli, M. (author), Beckers, A.L.D. (author)
Sidescan high-frequency (HF) sonar (i.e., with frequencies higher than 100 kHz) is ideally suited for providing high-resolution images of the seafloor. However, since sound does not penetrate into the sediment at these frequencies, such systems cannot be used for the detection of buried objects, such as naval mines, improvised explosive devices ...
conference paper 2012
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Ainslie, M.A. (author), Zampolli, M. (author), Ellis, D.D. (author)
The need for benchmarks of propagation loss, expressed eloquently by Felsen [1], was addressed in a series of propagation workshops in the 1980s. The main results of these workshops were a set of well defined propagation scenarios [2, 3] and a corresponding set of benchmark solutions [4, 5], which led in time to reliable models becoming...
conference paper 2012
document
Fillinger, L. (author), Hunter, A.J. (author), Zampolli, M. (author), Clarijs, M.C. (author)
Divers constitute a potential threat to waterside infrastructures. Active diver detection sonars are available commercially but present some shortcomings, particularly in highly reverberant environments. This has led to research on passive sonar for diver detection. Passive detection of open-circuit UBA (underwater breathing apparatus) has been...
article 2012
document
Zampolli, M. (author), Espana, A.L. (author), Williams, K.L. (author), Kargl, S.G. (author), Thorsos, E.I. (author), Lopes, J.L. (author), Kennedy, J.L. (author), Marston, P.L. (author)
The scattering from roughly meter-sized targets, such as pipes, cylinders and unexploded ordnance shells in the 130 kHz frequency band is studied by numerical simulations and compared to experimental results. The numerical tool used to compute the frequency and aspect-dependent target strength is a hybrid model, consisting of a local finite...
article 2012
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Zampolli, M. (author), Ainslie, M.A. (author)
In April 2010, a symposium in Memory of David Weston was held at Clare College in Cambridge (UK). International researchers from academia and research laboratories met to discuss two sets of test problems for sonar performance models, one aimed at understanding mammal echolocation sonar („Problem AI‟), and the other at benchmarking low frequency...
conference paper 2011
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Ainslie, M.A. (author), Harrison, C.H. (author), Zampolli, M. (author)
Previously published equations for the time dependence of the echo and reverberation in a Pekeris waveguide are combined with an expression derived for surface-generated noise. These closed form solutions are applied to the calculation of signal to reverberation ratio and signal to total background ratio for three CW pulses with centre...
conference paper 2011
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Quesson, B.A.J. (author), van Vossen, R. (author), Zampolli, M. (author), Beckers, A.L.D. (author)
The aim of the Mine Underwater Detection (MUD) project at TNO is to experimentally investigate the acoustic and magnetic detection of explosives underwater, buried in a soft sediment layer. This problem is relevant for the protection of harbors and littoral assets against terrorist attacks and for the detection of underwater unexploded ordnance ...
conference paper 2011
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Zampolli, M. (author), Ainslie, M.A. (author), van Zon, T. (author)
Ping-to-ping variations in echo level can be caused by time variations in sonar parameters (source level, orientation), target aspect, relative and absolute motion of sonar and target, and time varying environment (e.g. surface waves). Quantifying and understanding such fluctuations are important, since they enable an appropriate choice of...
conference paper 2011
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Fillinger, L. (author), Hunter, A.J. (author), Zampolli, M. (author), Clarijs, M.C. (author), Verolme, J.L. (author)
Divers and small vessels are increasingly recognized as a potential threat to high value assets. Harbour and waterside surveillance systems that are used to counter the threat of divers are usually based on active sonar, whose performance can be limited by reverberation in a harbour environment. Passive techniques are based on the detection of...
conference paper 2011
document
Fillinger, L. (author), Hunter, A.J. (author), Zampolli, M. (author), Clarijs, M.C. (author), Verolme, J.L. (author)
Situation awareness is an important component of security that justifies the equipment of sites with monitoring systems. For shore/harbour security, these systems are mostly composed of camera and radar, to monitor the land and the water surface, and of active sonar(s) when the underwater situation is monitored. An alternate approach for...
conference paper 2011
document
Williams, K.L. (author), Kargl, S.G. (author), Thorsos, E.I. (author), Burnett, D.S. (author), Lopes, J.L. (author), Zampolli, M. (author), Marston, P.L. (author), TNO Defensie en Veiligheid (author)
Understanding acoustic scattering from objects placed on the interface between two media requires incorporation of scattering off the interface. Here, this class of problems is studied in the particular context of a 61 cm long, 30.5 cm diameter solid aluminum cylinder placed on a flattened sand interface. Experimental results are presented for...
article 2010
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Zampolli, M. (author), Ainslie, M.A. (author), Schippers, P. (author), TNO Defensie en Veiligheid (author)
A set of eight sonar problems, pertaining to man-made active sonar, with source frequencies ranging from 250 Hz to 3.5 kHz, is defined. The scenarios are designed to emphasize range dependent propagation aspects in coastal waters, with the aim of testing all terms of the sonar equation (except the detection threshold) both before and after...
conference paper 2010
document
Zampolli, M. (author), Ainslie, M.A. (author), Schippers, P. (author), TNO Defensie en Veiligheid (author)
A set of eight sonar problems, pertaining to man-made active sonar, with source frequencies ranging from 250 Hz to 3.5 kHz, is defined. The scenarios are designed to emphasize range dependent propagation aspects in coastal waters, with the aim of testing all terms of the sonar equation (except the detection threshold) both before and after...
conference paper 2010
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Jensen, F.B. (author), Zampolli, M. (author), TNO Defensie en Veiligheid (author)
This paper summarizes 10 years of NURC experience with the application of a state-of-the-art FE code [Zampolli et al., JASA 122, 1472-85 (2007)] to propagation and scattering problems in ocean acoustics. We show benchmark results for low-frequency propagation in a range-dependent waveguide with an elastic bottom, and object scattering results...
conference paper 2010
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Ainslie, M.A. (author), Zampolli, M. (author), TNO Defensie en Veiligheid (author)
The Validation of Sonar Performance Assessment Tools Symposium, organised by the Institute of Acoustics was held in Cambridge, UK on 7-9 April 2010. The meeting was held in memory of David E. Weston and consequently is also known as the “Weston Memorial Symposium”. Two sonar scenarios were considered for the Weston Memorial Symposium, one man...
conference paper 2010
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