Searched for: subject%3A%22Estimation%22
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Zwane, E.N. (author), van der Pal-de Bruin, K.M. (author), van der Heijden, P.G.M. (author), TNO Preventie en Gezondheid (author)
In multiple-record systems estimation it is usually assumed that all registration relate to the same population. In this paper, we develop a method which can be used when the registrations relate to different populations, in the sense that they cover, for example, different time periods or regions. We show that under certain conditions ignoring...
article 2004
document
Mantel, O.C. (author), Rijken, M. (author), Matic, D. (author), Mawira, A. (author)
Signal level predictions for sector antennas in mobile networks strongly depend on the antenna pattern used in the prediction tool. For built-up areas, reflections and scattering often lead to a significant energy component at the back of the antenna, and the theoretical antenna pattern does not account for this effect. We propose a method that ...
conference paper 2004
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Berendrecht, W.L. (author), Heemink, A.W. (author), van Geer, F.C. (author), Gehrels, J.C. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
A nonlinear state-space model is developed for describing water table fluctuations in groundwater systems that are influenced by drains. As drains are only active if the water table is above drainage level, the regime of the system switches at the drainage level. The water table depth is related to observations on precipitation and...
article 2004
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Heus, R. (author), den Hartog, E.A. (author), Kistemaker, L.J.A. (author), van Dijk, W.J. (author), Swenker, G. (author), TNO Technische Menskunde (author)
Due to more stringent requirements to protect personnel against hazardous gasses, the inspiratory resistance of the present generation of respiratory protective devices tends to increase. Therefore an important question is to what extent inspiratory resistance may increase without giving problems during physical work. In this study the effects...
article 2004
document
Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Miller, B. (author)
We present a new measure called target identifiability, as an efficient alternative for measuring identification scores. Identifiability is operationally defined as the amount of blur required to reduce the target signature to its identification threshold. It can quickly be determined using a simple adjustment procedure. To validate the new...
conference paper 2004
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van der Mark, W. (author), Fontijne, D. (author), Dorst, L. (author), Groen, F.C.A. (author), TNO Fysisch en Elektronisch Laboratorium (author)
A method for estimating ego-motion with vehicle mounted stereo cameras is presented. This approach is based on finding corresponding features in stereo images and tracking them between succeeding stereo frames. Our approach estimates stereo ego-motion with geometric algebra techniques. Starting with a simple linear estimate of the ego-motion,...
conference paper 2003
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van Erp, J.B.F. (author), Padmos, P. (author)
Indirect viewing systems such as tv cameras can potentially support drivers under low visibility conditions or when the driver's field of view (FOV) is restricted. In three experiments, we identified the critical image parameters of such systems on vehicle control. We used a taskbattery that measured lateral and longitudinal vehicle control in...
article 2003
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TNO Fysisch en Elektronisch Laboratorium (author), Steeghs, T.P.H. (author), Gelsema, S.J. (author)
The use of ISAR imagery for Automatic Target Recognition is seriously hampered by the difficulty of target motion compensation. Phase perturbations that result from target maneuvers during the processing interval need to be corrected for. In a previous paper, we demonstrated the use of the local Radon transform for estimating the radial velocity...
conference paper 2003
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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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Verver, M.M. (author), van Hoof, J.F.A.M. (author), TNO Automotive (author)
The importance of comfort for the automotive industry is increasing. Car manufacturers use comfort to distinguish their products from their competitors. However, the development and design of a new car seat or interior is very time consuming and expensive. The introduction of computer models of human and seat could accelerate this process. This...
article 2002
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Zuurbier, J. (author), Bremmer, P. (author), TNO Wegtransportmiddelen (author)
This paper discusses a vehicle controller and a state estimator that was implemented and tested in a vehicle equipped with a combined braking and chassis control system to improve handling. The vehicle dynamics controller consists of a feed forward body roll compensation and a feedback stability controller. The estimator is based on a non-linear...
conference paper 2002
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Technisch Physische Dienst TNO - TH (author), Smeulers, J.P.M. (author), Zeelen, R. (author), Bos, A. (author)
This paper describes the basic concepts of the PROMIS methodology for system's Prognostic Health Management (PHM). The key elements of the PROMIS methodology are: (i) system health is monitored by continuously measuring so-called Condition Parameters (CPs), representing the physical condition of critical system components, (ii) CPs are derived...
conference paper 2002
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TNO Milieu, Energie en Procesinnovatie (author), Leskens, M. (author), van Kessel, L.B.M. (author), van den Hof, P.M.J. (author)
In this paper, the application of a specific system identification procedure to a municipal solid waste (MSW) incinerator is discussed. This procedure is a combination of, on the one hand, a particular closed-loop identification method called the two-stage method and, on the other hand, the approach of high-order multiple input multiple output ...
article 2002
document
Technisch Physische Dienst TNO - TH (author), Kraaij, W. (author), Westerveld, T. (author), Hiemstra, D. (author)
An important class of searches on the world-wide-web has the goal to find an entry page (homepage) of an organisation. Entry page search is quite different from Ad Hoc search. Indeed a plain Ad Hoc system performs disappointingly. We explored three non-content features of web pages: page length, number of incoming links and URL form. Especially...
conference paper 2002
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Energieonderzoek Centrum Nederland (author), Ybema, J.R. (author), Volkers, C.H. (author), Jansen, J.C. (author), Battjes, J.J. (author), Sijm, J.P.M. (author)
This report presents an approach, called the Multi-Sector Convergence(MSC) framework, to generate comprehensive sets of national targets for greenhouse gas (GHG) mitigation. The MSC framework is aimed at facilitating international negotiations on national emission mitigation targets after the first budget period defined in the Kyoto Protocol....
report 2001
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TNO Fysisch en Elektronisch Laboratorium (author), Breuers, M. (author), de Reus, N.M. (author)
The problem of estimating aircraft pose information from mono-ocular image data is considered using a Fourier descriptor based algorithm. The dependence of pose estimation accuracy on image resolution and aspect angle is investigated through simulations using sets of synthetic aircraft images. Further evaluation shows that good pose estimation...
conference paper 2001
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Koning, R.F.F. (author), Chou, C.T. (author), Verhaegen, M.H.G. (author), Klaassens, J.B. (author), Uittenbogaart, J.R. (author)
AC machines are applied in actuator systems for many applications. The development of fast processors open up the possibilities to apply new techniques for identification and control of electrical drives in real-time, so as to improve and optimize their performances. The paper presents a systematic approach to identify the physically relevant...
article 2000
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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
document
Verwey, W.B. (author)
In order to develop a driver-car interface that adapts the presentation of messages generated by in-vehicle information systems to driver workload, two experiments investigated potential determinants of driver visual and mental workload as indicated by performance on two secondary tasks. Experiment 1 suggested that road situation is a major...
article 2000
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Tool, C.J.J. (author), van Roosmalen, J.A.M. (author), Daey Ouwens, J. (author), Energieonderzoek Centrum Nederland (author)
The study on the title subject was performed to identify thepossibilities of CIS solar cells. The interest in thin film CIS solar cells is growing rapidly. The potential of CIS mostly stems from its possible high stable efficiency at production costs comparable to other thin films (e.g. a- Si, CdTe). The main drawback of CIS is the limited...
report 1999
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