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Van de Brekel, B.J.H. (author)Multipath effects form a serious threat to high precision GPS and DGPS applications. The errors caused by multipath can have values of more than 100 meters. This paper shows that when a rotating antenna is used in stead of a stationary one, the multipath errors can be mitigated to great effect, both for carrier phase and code range errors. The...master thesis 1992
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- Bartels, G.A. (author) report 1995
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- Van Nee, D.J.R. (author) doctoral thesis 1995
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Eijkman, M.T. (author)In het Global Positioning System (GPS) wordt de positie berekend door de afstanden tot satellieten te bepalen uit de vertragingstijd van de uitgezonden signalen.<br/> Er kunnen echter grote fouten in de positiebepaling ontstaan wanneer de signalen niet alleen rechtstreeks worden ontvangen, maar ook gereflecteerd (multipath). Om dit ...master thesis 1995
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Septiawan, R. (author)De satellieten van het Global Positioning System bevinden zich op 20.000 km boven het aardoppervlak. Het navigatie signaal van deze satellieten is heel zwak bij de ontvanger van de gebruikers. Daardoor is dit signaal makkelijk te verstoren door een interferentiebron. In mijn afstudeeropdracht wordt onderzoek gedaan om deze interferentie te...master thesis 1995
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Hartlieb, E.S. (author)Proceeding a short overview of the Navigation simulation (NAVSIM) within the SIMONA research simulator, a detailed description of NAVSIM will be given. For NAVSIM, a modular schematic has been developed. The models of the navigation system must comply to this schematic. In this report, the following radionavigation systems will be discussed: VOR...master thesis 1995
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Van 't Geloof, J. (author)Currently a debate is in progress concerning the technical capabilities of the Global Positioning System, to provide the primary aid for precision approach and landing of airplanes. The signal levels of the received satellite signals are very low because of the propagation distance of about 20000 km. GPS receivers are, therefore, susceptible to...master thesis 1995
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- Nedlloyd Lines (author) report 1996
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- Jin, X.X. (author) doctoral thesis 1996
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- Bartels, G.A. (author) book 1997
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Visser, P.N.A.M. (author), Van den IJssel, J. (author)The computation of high-accuracy orbits is a prerequisite for the success of Low Earth Orbiter (LEO) missions such as CHAMP, GRACE and GOCE. The mission objectives of these satellites cannot be reached without computing orbits with an accuracy at the few cm level. Such a level of accuracy might be achieved with the techniques of reduced-dynamic...journal article 2003
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- Da Silva Fernandes, R.M. (author) doctoral thesis 2004
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Kusche, J. (author), Schrama, E.J.O. (author)Monitoring hydrological redistributions through their integrated gravitational effect is the primary aim of the Gravity Recovery and Climate Experiment (GRACE) mission. Time?variable gravity data from GRACE can be uniquely inverted to hydrology, since mass transfers located at or near the Earth's surface are much larger on shorter timescales...journal article 2005
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The upcoming GNSS Galileo, with its new satellite geometry and frequency plan, will not only bring many benefits for navigation and positioning but also help to improve ionosphere delay estimation. This paper investigates ionosphere estimation with Galileo and compares it with the results from GPS-only and combined GPS-Galileo. The standard...journal article 2006
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Socquet, A. (author), Simons, W.J.F. (author), Vigny, C. (author), McCaffrey, R. (author), Subarya, C. (author), Sarsito, D. (author), Ambrosius, B. (author), Spakman, W. (author)The island of Sulawesi, eastern Indonesia, is located within the triple junction of the Australian, Philippine, and Sunda plates and accommodates the convergence of continental fragments with the Sunda margin. We quantify the kinematics of Sulawesi by modeling GPS velocities and earthquake slip vectors as a combination of rigid block rotations...journal article 2006
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- Schrama, E.J.O. (author), Visser, P.N.A.M. (author) journal article 2007
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Bos, M.S. (author), Fernandes, R.M.S. (author), Williams, S.D.P. (author), Bastos, L. (author)It has been generally accepted that the noise in continuous GPS observations can be well described by a power-law plus white noise model. Using maximum likelihood estimation (MLE) the numerical values of the noise model can be estimated. Current methods require calculating the data covariance matrix and inverting it, which is a significant...journal article 2007
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Signal and noise in Gravity Recovery and Climate Experiment (GRACE) observed surface mass variationsSchrama, E.J.O. (author), Wouters, B. (author), Lavallée, D.A. (author)The Gravity Recovery and Climate Experiment (GRACE) product used for this study consists of 43 monthly potential coefficient sets released by the GRACE science team which are used to generate surface mass thickness grids expressed as equivalent water heights (EQWHs). We optimized both the smoothing radius and the level of approximation by...journal article 2007
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Odijk, D. (author), Teunissen, P.J.G. (author)Successful carrier phase ambiguity resolution is the key to high-precision positioning with Global Navigation Satellite Systems (GNSS). The ambiguity dilution of precision (ADOP) is a well-known scalar measure which can be used to infer the strength of the GNSS model for carrier phase ambiguity resolution. In this contribution we present...journal article 2008
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Bitenc, M. (author), Bloemsma, M.R. (author), Duijnmayer, K. (author), Lin, K. (author), Piozziol, S. (author), Saleh, M.A.G. (author), Stam, J. (author), Widiastuti, E. (author), Yin, Y. (author)There are currently three active projects under development for the Delfland coast, all aiming at reinforcing the coast. The main issue is where to put the sand such that it arrives at the coast in the best place, without causing any damage to e.g. the new nature development. To answer this question, knowledge about sand transport is necessary,...student report 2008