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- van den Heuvel, J.C. (author), Schoemaker, R.M. (author), Schleijpen, H.M.A. (author) conference paper 2010
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), Schoemaker, R.M. (author), Schleijpen, H.M.A. (author)Current coastal operations have to deal with threats at short range in complex environments with both neutral and hostile targets. There is a need for fast identification, which is possible with a laser range profiler. A number of field trials have been conducted to validate the concept of identification with a laser range profile. A laser range...conference paper 2009
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), van Putten, F.J.M. (author), Cohen, L.H. (author), Kemp, R.A.W. (author), Franssen, G.C. (author)Coastal surveillance and naval operations in the littoral both have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and a low velocity that makes them hard to detect by radar. Typical threats include jet skis, FIAC's, and speedboats. Previous lidar measurements at the coast of the Netherlands...conference paper 2009
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TNO Defensie en Veiligheid (author), Franssen, G.C. (author), Schleijpen, H.M.A. (author), van den Heuvel, J.C. (author), Buersing, H. (author), Eberle, B. (author), Walter, D. (author)In recent years, much advance in the field of high-power femtosecond laser technology has been made. The high pulse power of femtosecond laser systems leads to various interesting phenomena, such as a very high power density and the formation of a plasma in the propagation medium, which is usually air. The possible application of femtosecond...conference paper 2009
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- van den Heuvel, J.C. (author), van Eijk, A.M.J. (author), Bekman, H.H.P.T. (author), van Putten, F.J.M. (author), Cohen, L.A. (author), Pace, P.W. (author), TNO Defensie en Veiligheid (author) conference paper 2008
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), Bekman, H.H.P.T. (author), van Putten, F.J.M. (author), Cohen, L.H. (author), Schleijpen, H.M.A. (author)Coastal surveillance and naval operations in the littoral both have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and a low velocity that makes them hard to detect by radar. Typical threats include jet skis, FIAC’s, and speedboats. Lidar measurements at the coast of the Netherlands have shown...conference paper 2008
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), Pace, P. (author), Bekman, H.H.P.T. (author), van Putten, F.J.M. (author), Schleijpen, H.M.A. (author)Naval operations in the littoral have to deal with threats at short range in cluttered environments with both neutral and hostile targets. There is a need for fast identification, which is possible with a laser range profiler. Additionally, in a coastal-surveillance scenario a laser range profiler can be used for identification of small sea...conference paper 2008
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Dubbelman, G. (author), van der Mark, W. (author), van den Heuvel, J.C. (author), Groen, F.C.A. (author), TNO Defensie en Veiligheid (author)We have developed a stereo vision based obstacle detection (OD) system that can be used to detect obstacles in off-road terrain during both day and night conditions. In order to acquire enough depth estimates for reliable OD during low visibility conditions, we propose a stereo disparity (depth) estimation approach that uses fine-to-coarse...conference paper 2007
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van der Mark, W. (author), van den Heuvel, J.C. (author), Groen, F.C.A. (author), TNO Defensie en Veiligheid (author)Autonomous robot vehicles that operate in offroad terrain should avoid obstacle hazards. In this paper we present a stereo vision based method that is able to cluster reconstructed terrain points into obstacles by evaluating their relative angles and distances. In our approach, constraints are enforced on these geometric properties by a set of...conference paper 2007
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TNO Defensie en Veiligheid (author), Schleijpen, H.M.A. (author), Dimmeler, A. (author), Eberle, B (author), van den Heuvel, J.C. (author), Mieremet, A.L. (author), Bekman, H.H.P.T. (author), Mellier, B. (author)Laser countermeasures against infrared focal plane array cameras aim to saturate the full camera image. In this paper we will discuss the results of dazzling experiments performed with MWIR lasers. In the “low energy” pulse regime we observe an increasing saturated area with increasing power. The size of the saturated area can be explained by an...conference paper 2007
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TNO Defensie en Veiligheid (author), van den Broek, A.C. (author), van den Broek, S.P. (author), van den Heuvel, J.C. (author), Schwering, P.B.W. (author), van Heijningen, A.W.P. (author)Maritime borders and coastal zones are susceptible to threats such as drug trafficking, piracy, undermining economical activities. At TNO Defence, Security and Safety various studies aim at improving situational awareness in a coastal zone. In this study we focus on multi-sensor surveillance of the coastal environment. We present a study on...conference paper 2007
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), Bekman, H.H.P.T. (author), Putten, F.J.M. (author), Cohen, L.A. (author)Naval operations in the littoral have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and low velocity, which makes them hard to detect by radar in the presence of sea clutter. Typical threats include periscopes, jet skies, FIAC’s, and speedboats. Search lidars on board naval vessels can provide...conference paper 2007
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TNO Defensie en Veiligheid (author), van den Heuvel, J.C. (author), Bekman, H.H.P.T. (author), van Putten, F.J.M. (author), Cohen, L.H. (author)Naval operations in the littoral have to deal with threats at short range in cluttered environments with both neutral and hostile targets. On board naval vessels there is a need for fast identification, which is possible with a laser range profiler. Additionally, in a coast-surveillance scenario a laser range profiler can be used for...conference paper 2007
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TNO Defensie en Veiligheid (author), Schleijpen, H.M.A. (author), van den Heuvel, J.C. (author), Mieremet, A.J. (author), Mellier, B. (author), van Putten, F.J.M. (author)Laser countermeasures against infrared focal plane array cameras aim to saturate the full camera image. In this paper we will discuss the results of three different dazzling experiments performed with MWIR lasers and show that the obtained results are independent of the read-out mechanism of the camera and can be explained by an expression...conference paper 2007
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Jansen, P. (author), van der Mark, W. (author), van den Heuvel, J.C. (author), Groen, F.C.A. (author), TNO Defensie en Veiligheid (author)Terrain classification is an important problem that still remains to be solved for off-road autonomous robot vehicle guidance. Often, obstacle detection systems are used which cannot distinguish between solid obstacles such as rocks or soft obstacles such as tall patches of grass. Terrain classification is needed to prevent that the robot is...conference paper 2005
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TNO Defensie en Veiligheid (author), Bekman, H.H.P.T. (author), van Putten, F.J.M. (author), Schleijpen, H.M.A. (author), van den Heuvel, J.C. (author)Countermeasures against heat seeking missiles require access to efficient laser sources, which should emit wavelengths at band I, II and IV. Efficient diode pumped solid-state lasers, combined with efficient non-linear wavelength shifters, allow the development of practical tuneable mid-IR countermeasure sources. The paper describes the...conference paper 2005
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TNO Defensie en Veiigheid (author), Kunz, G.J. (author), Bekman, H.H.P.T. (author), Benoist, K.W. (author), Cohen, L.H. (author), van den Heuvel, J.C. (author), Putten, F.J.M. (author)Small maritime targets, e.g., periscope tubes, jet skies, swimmers and small boats, are potential threats for naval ships under many conditions, but are difficult to detect with current radar systems due to their limited radar cross section and the presence of sea clutter. On the other hand, applications of lidar systems have shown that the...conference paper 2005
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TNO Fysisch en Elektronisch Laboratorium (author), van den Heuvel, J.C. (author), van Putten, F.J.M. (author), van Koersel, A.C. (author), Schleijpen, H.M.A. (author)Acoustic landmine detection (ALD) is a technique for the detection of buried landmines including non-metal mines. Since it gives complementary results with GPR or metal detection, sensor fusion of these techniques with acoustic detection would give promising results. Two methods are used for the acoustic excitation of the soil: laser excitation...conference paper 2004
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TNO Fysisch en Elektronisch Laboratorium (author), van der Mark, W. (author), van den Heuvel, J.C. (author), den Breejen, E. (author), Groen, F.C.A. (author)Vehicles that serve in the role as landmine detection robots could be an important tool for demining former conflict areas. On the LOTUS platform for humanitarian demining, different sensors are used to detect a wide range of landmine types. Reliable and accurate detection depends on correctly combining the observations from the different...conference paper 2003
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TNO Fysisch en Elektronisch Laboratorium (author), Lutzmann, P. (author), van den Heuvel, J.C. (author), Klien, V. (author), Schleijpen, H.M.A. (author), Hebel, M. (author), van Putten, F.J.M. (author)Acoustic landmine detection (ALD) is a technique for the detection of buried landmines including non-metal mines. An important issue in ALD is the acoustic excitation of the soil. Laser excitation is promising for complete standoff detection using lasers for excitation and monitoring. Acoustic excitation is a more common technique that gives...conference paper 2003
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