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| GEOG0625-1 | Global Navigation Satellite Systems
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| Duration : | 25h Th, 5h Pr |
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| Credits/ECTS : |
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| Holder(s) : | René Warnant |
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| Language : | French language |
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| Course contents : | The course analyses in details the different concepts on which Global Navigation Satellite Systems are based. It is mainly dedicated to the US GPS (Global Positioning System).
Chapter 1 describes the 3 GPS segments (space segment, ground segment, user segment); it outlines the basic principle of satellite positioning. It analyses GPS signal structure and the different GPS observables (dual frequency phase and code measurements).
In Chapter 2, GPS observation equations are derived ( i. e. the link between GPS observables and the unknown tridimensional user position is established).
Chapter 3 reviews the different error sources which affect GPS measurements and analyses their modelling; the course focuses on atmospheric effects (neutral and ionized atmosphere).
Chapter 4 reviews the different positioning modes: absolute, relative or differential positioning, real-time or post-processing, use of code and/or phase measurements. Then, the main modern positioning techniques are reviewed; high accuracy positioning techniques (centimetre or sub-centimetre) are analysed in more details. Finally, Chapter 4 discusses the phase ambiguity resolution; it analyses the influence of unmodelled error sources (mainly, atmospheric influences) on the ambiguity resolution process and on the accuracy of relative positioning. This discussion is illustrated with practical cases based on real data.
Chapter 5 is dedicated to GNSS applications, mainly in Geophysics (tectonics, seismology, meteorology, ionosphere physics), in Geodesy (Reference Frames) and in topography.
Chapter 6 briefly describes the European positioning system Galileo and highlights its main added value (with respect to GPS) in the frame of the applications presented in Chapter 5. |
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| Course objective : | The main objective of the course is to give students the necessary material in order to be able to use GNSS mainly in the frame of high accuracy applications (centimetre and sub-centimetre) in Geodesy, Geophysics and in topography. In particular, students will be able to analyse the reliablility of positions measured by GNSS and to identify the origin of possible problems with the measurements. |
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| Prerequisites : | Basic lecture in general Physics (mainly wave physics). |
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| Organization : | The course is organized in 10 lectures of 3 hours during the second semester. |
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| Written notes : | Lecture notes are available (pdf file). |
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| Assessment : | The evaluation consists in an oral exam (with written preparation) on the material seen during theorical lectures. |
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| Contacts : | René Warnant (Professor)
Tel : 02/373 02 51
E-mail: Rene.Warnant@ulg.ac.be
Benoît Bidaine (Ph. D. Student FNRS)
Tel : 04/366 56 33
E-mail : B.Bidaine@ulg.ac.be
Matthieu Lonchay (Ph. D. Student FNRS)
Tel : 04/366 56 33
E-mail : M.Lonchay@ulg.ac.be |
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