Searched for: author%3A%22Theil%2C+A.%22
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Theil, A. (author)
conference paper 2023
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Brettschneider, A. (author), van Onno van Gent, O.J. (author), Rindt, S. (author), Tan, R.G. (author), Theil, A. (author)
Radarsystemen ondervinden mogelijk hinder van windturbines of windmolenparken. Het Ministerie van Defensie heeft daarom normen opgesteld waartegen de prestatie van de luchtverkeersradarsystemen getoetst moet worden. Deze normen gelden voor zowel de militaire als de civiele luchtverkeersleidingsradarsystemen in Nederland, te weten de...
report 2021
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van Gent, O.J. (author), Jansen, E. (author), Theil, A. (author)
report 2021
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van Gent, O.J. (author), Kalff, F.J. (author), Rindt, S. (author), Theil, A. (author)
report 2021
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Zwamborn, A.P.M. (author), Theil, A. (author)
Het Ministerie van Defensie heeft het voornemen om een radarinstallatie te plaatsen die door de Koninklijke Luchtmacht (KLu) gebruikt zal worden om het luchtruim boven Nederland te bewaken. Ook voor de begeleiding van eigen gevechtsvliegtuigen is dit radarsysteem van belang. Vergeleken met een ATC (Air Traffic Control) radarsysteem, waarvan er...
report 2020
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Zwamborn, A.P.M. (author), Theil, A. (author)
In this report (written in the Dutch language) a non-ionizing radiation hazards analysis has been conducted for the SMART-L air-defense radar planned in Herwijnen, The Netherlands. The expected RF exposure is compared with the reference values from ICNIRP1998 as well as the recently published ICNIRP2020.
report 2020
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Theil, A. (author), Tan, R.G. (author), Boschma, J.J. (author), Jacobs, S. (author)
The usage of radar system modeling in the radar resource manager (RRM) or in the resource manager of a suite of sensors is discussed. Multiple ways to monitor the validity of the models are identified. The capability of such models to predict estimated elevation angle under anomalous propagation conditions has been investigated. Satisfactory...
conference paper 2017
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Nooij, P.N.C. (author), Theil, A. (author)
Blake chart computations are widely employed to rank detection coverage capabilities of competitive search radar systems. Developed for comparable 2D radar systems with a mechanically rotating reflector antenna, it was not necessary to regard update rate and plot quality in Blake's chart. To characterize the system's critical awareness, the...
conference paper 2014
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Wasselin, J.-P. (author), Mazuel, S. (author), Itcia, E. (author), Huizing, A.G. (author), Theil, A. (author)
The ROCKWELL COLLINS France radar department is currently developing a FMCW radar system for the detection and the classification of small maritime targets in the frame of the SISMARIS, SARGOS & I2C projects. Several test campaigns have been conducted since 2009 to develop a sensor as well as an innovating signal processing chain which provides...
conference paper 2012
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Theil, A. (author), Schouten, M.W. (author), de Jong, A.J. (author), TNO Defensie en Veiligheid (author)
A wind turbine placed in the vicinity of a primary radar system (PSR) can impact the performance of that system. This paper discusses criteria by which wind turbine placement can be assessed. The effects considered are desensitization overhead and shadowing. The criteria have been implemented in a wind turbine acceptance program that is going to...
conference paper 2010
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Ditzel, M. (author), Lageweg, C.R. (author), Janssen, J.A.A.J. (author), Theil, A. (author), TNO Defensie en Veiligheid (author)
article 2008
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TNO Defensie en Veiligheid (author), Groot, J.S. (author), Dam, F.A.M. (author), Theil, A. (author)
Ground based emitters can be located with a receiver installed on an airborne platform. This paper discusses techniques based on Doppler frequency and differential phase measurements (interferometry). Measurements of the first technique are provided, while we discuss and compare the theoretical accuracy of both. In addition, we demonstrate the...
conference paper 2008
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Theil, A. (author), van Ewijk, L.J. (author), TNO Defensie en Veiligheid (author)
Wind turbines located in the vicinity of a radar system may affect the system's detection and tracking capability. A description of adverse effects is given in the paper for both primary and secondary radar. In order to judge the consequence of the shadowed volume cast by a wind turbine, results of radar performance analyses are presented. It is...
conference paper 2007
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Theil, A. (author), Bergmans, J. (author), van den Broek, S.P. (author), Huizing, A.G. (author), Kester, L.J.H.M. (author), TNO Defensie en Veiligheid (author)
The traditional approach to maritime operations in open ocean conditions (‘blue waters’) is platform centric. In this approach, an environmental picture is generated on each platform separately. High quality tracks can be made available to other platforms through classic data links, e.g. Link 11 and 16. In case of maritime operations in littoral...
conference paper 2006
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Theil, A. (author), Huizing, A. (author), Heijningen, A.W.P. (author), TNO Defensie en Veiligheid (author)
Single Picture Integration for Territorial Water Surveillance (SPITS) is an initiative conducted by TNO Defence, Security and Safety in which techniques to enhance the quality of the maritime surface picture are considered. Observing the environment with a suite of dissimilar sensors is considered to be a key-element to reach this goal. The...
conference paper 2006
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Schwering, P.B.W. (author), Theil, A. (author), TNO Fysisch en Elektronisch Laboratorium (author)
This paper describes a number of projects at TNO-FEL in the field of sensor fusion of radar and electrooptical sensors. These fusion approaches consider land, air, and maritime scenarios for surveillance and autonomous detection tasks. Fusion benefits are present when uncorrelated and complementary sensor data is present. Data from different...
conference paper 2002
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Smith, A.J.E. (author), Gelsema, S.J. (author), Kester, L.J.H.M. (author), Melief, H.W. (author), Premel Cabic, G. (author), Theil, A. (author), Woudenberg, E. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Doppler polarimetry in a surveillance radar for the maritime surface picture is considered. This radar must be able to detect low-RCS targets in littoral environments. Measurements on such targets have been conducted with a coherent polarimetric measurement radar in March 2001 and preliminary results from that campaign are presented. The system...
conference paper 2002
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Theil, A. (author), Hopmans, L.J.M. (author), Gelsema, S.J. (author), Kester, L.J.H.M. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Doppler polarimetry in a surveillance radar for the maritime surface picture is considered. This radar must be able to detect low-RCS targets in littoral environments. An overview is given of subjects that are relevant for the system's design, Discussed are: physical phenomena that can be exploited by a coherent polarimetric radar, the effecs of...
conference paper 2001
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TNO Fysisch en Elektronisch Laboratorium (author), Kester, L.J.H.M. (author), Theil, A. (author)
Fusion of radar and EO-sensors is investigated for the purpose of surveillance in littoral waters is. All sensors are considered to be co-located with respect to the distance, typically 1 to 10 km, of the area under surveillance. The sensor suite is a coherent polarimetric radar in combination with a set of camera's sensitive to visible light,...
conference paper 2001
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TNO Fysisch en Elektronisch Laboratorium (author), Theil, A. (author), Kester, L.J.H.M. (author), van den Broek, S.P. (author), van Dorp, Ph. (author), van Sweeden, R. (author)
Area surveillance for guarding and intruder detection with a combined camera radar sensor is considered. This specific sensor combination is attractive since complementary information is provided by the respective elements. Thus, a more complete description of objects of interest can be obtained. Several strategies to fuse the data are discussed...
conference paper 2001
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