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Beers, B.J. (author), Broere, J. (author), Swart, A. (author), Joosten, P. (author)The use of digital panoramic imagery in processes at municipal and cadastral authorities has become common over the last decade. Applications are found among situational awareness, inventory of public areas, real estate valuation, assessment of permits and inspecting security risks. More and more the imagery is being used for measuring and map...conference paper 2011
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Dunning, A.G. (author)This paper presents the first zero stiffness six degrees of freedom (DoF) compliant precision stage. To deal with problems like backlash, friction and lubrication for performing ultra-precise positioning in a vacuum environment, a novel compliant structure is proposed. All six degrees of freedom are statically balanced (i.e. near zero stiffness)...master thesis 2011
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Van Bree, R.J.P. (author), Tiberius, C.C.J.M. (author)The performance of real-time single-frequency precise point positioning is demonstrated in terms of position accuracy. This precise point positioning technique relies on predicted satellite orbits, predicted global ionospheric maps, and in particular on real-time satellite clock estimates. Results are presented using solely measurements from a...journal article 2011
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Bock, H. (author), Jäggi, A. (author), Meyer, U. (author), Visser, P.N.A.M. (author), Van den IJssel, J.A.A. (author), Van Helleputte, T. (author), Heinze, M. (author), Hugentobler, U. (author)The first ESA (European Space Agency) Earth explorer core mission GOCE (Gravity field and steady-state Ocean Circulation Explorer) was launched on 17 March 2009 into a sun-synchronous dusk–dawn orbit with an exceptionally low initial altitude of about 280 km. The onboard 12-channel dual-frequency GPS (Global Positioning System) receiver delivers...journal article 2011
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Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D. (author)Precise formation flying (PFF) missions require formation acquisition and maintenance through interactions among spacecraft by inter-satellite communication and relative navigation. That requires the network architecture to satisfy dedicated system constraints of time-criticality for updating navigation measurements and flexibility for...conference paper 2011
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Karczewski, M.P. (author)The thesis presents the results of research into temporal preference analysis in recommender systems. Temporal preference analysis consists of methods for detecting time recurrent changes in user preferences and for using this information to improve the recommendation precision.master thesis 2011
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Kaya, O. (author)In this thesis, the development and implementation of a new precision RC-locked oscillator topology suitable for wireless sensor networks (WSNs) is described. The objective of this thesis was to investigate the performance of the proposed topology and to compare this with the state-of-the-art in terms of accuracy and power consumption. The new...master thesis 2010
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Paalvast, S.L. (author)The primary goal of this research was to study the feasibility of a thermal micro actuator for improved tracking performance of a Hard Disk Drive (HDD), and the feasibility of thermal actuation for precision micro motion and positioning in general. The fast dynamics of the micro actuator allows it to quickly correct position errors and thus...doctoral thesis 2010
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Memarzadeh, Y. (author)The main objective of this thesis is to develop a procedure for modeling and predicting ionospheric Total Electron Content (TEC) for high precision differential GNSS applications. As the ionosphere is a highly dynamic medium, we believe that to have a reliable procedure it is necessary to transfer the high temporal resolution GNSS network data...doctoral thesis 2009
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Khan, S. (author), Sabanovic, A. (author), Nergiz, A.O. (author)In this paper, the design of a discrete-time sliding-mode controller based on Lyapunov theory is presented along with a robust disturbance observer and is applied to a piezostage for high-precision motion. A linear model of a piezostage was used with nominal parameters to compensate the disturbance acting on the system in order to achieve...journal article 2009
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Taouil, M. (author)One of the key kernels in scientific applications is the Sparse Matrix Vector Multiplication (SMVM). Profiling OpenFOAM, a sophisticated scientific Computational Fluid Dynamics tool, proved the SMVM to be its most computational intensive kernel. A traditional way to solve such computationally intensive problems in scientific applications is to...master thesis 2009
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Wienia, R.J. (author)GPS-transmitted waves are affected by the Earth's atmosphere resulting in a decrease of the measured position accuracy. The highest region of the atmosphere, known as the ionosphere, is the main cause of this accuracy degradation. Due to the dispersive nature of the ionosphere for GPS-signals, the induced delay can be measured or eliminated if a...master thesis 2008
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- Derkx, J.M. (author) doctoral thesis 2008
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Visser, P.N.A.M. (author)A method has been implemented and tested for estimating bias and scale factor parameters for all six individual accelerometers that will fly on-board of GOCE and together form the so-called gradiometer. The method is based on inclusion of the individual accelerometer observations in precise orbit determinations, opposed to the baseline method...journal article 2008
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Montenbruck, O. (author), Andres, Y. (author), Bock, H. (author), Van Helleputte, T. (author), Van den IJssel, J. (author), Loiselet, M. (author), Marquardt, M. (author), Silvestrin, P. (author), Visser, P. (author), Yoon, Y. (author)The global navigation satellite system receiver for atmospheric sounding (GRAS) on MetOp-A is the first European GPS receiver providing dual-frequency navigation and occultation measurements from a spaceborne platform on a routine basis. The receiver is based on ESA’s AGGA-2 correlator chip, which implements a high-quality tracking scheme for...journal article 2008
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- Le, A.Q. (author), Tiberius, C. (author) journal article 2007
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- Teunissen, P.J.G. (author) journal article 2007
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Bana, I.V. (author)Traditional finishing, like grinding, particularly in the machining of hardened parts, requires the consumption of a significant amount of coolant. This is harmful for the environment. Besides this, more initiatives were taken in process planning to improve the process economy and flexibility. Reduction of machining cost and time is one of the...doctoral thesis 2006
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Kroes, R. (author)Spacecraft formation flying is considered as a key technology for advanced space missions. Compared to large individual spacecraft, the distribution of sensor systems amongst multiple platforms offers improved flexibility, shorter times to mission, and the prospect of being more cost effective. Besides these advantages, satellite formations in...doctoral thesis 2006
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Tuinhout, H.P. (author)This thesis is about evaluating differences between electrical properties of closely spaced, supposedly identical, transistors (matched pairs) in integrated circuits (IC's). Electrical properties of transistors in IC's generally exhibit relatively large spreads due to variations of production equipment. Such spreads limit the attainable...doctoral thesis 2005