| Reference : MULTI-GNSS ERROR CHARACTERISTICS AND BENEFITS TO LONG-TERM MONITORING APPLICATIONS IN... |
| Dissertations and theses : Doctoral thesis | |||
| Engineering, computing & technology : Multidisciplinary, general & others | |||
| http://hdl.handle.net/10993/37191 | |||
| MULTI-GNSS ERROR CHARACTERISTICS AND BENEFITS TO LONG-TERM MONITORING APPLICATIONS IN GEOSCIENCES | |
| English | |
| Abraha, Kibrom Ebuy [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > >] | |
| 27-Apr-2018 | |
| University of Luxembourg, Luxembourg | |
| Docteur en Sciences de l'Ingénieur | |
| 230 | |
Teferle, Felix Norman  | |
| Van Baars, Stefan | |
| van Dam, Tonie | |
| Dach, Rolf | |
| Bogusz, Janusz | |
| [en] Global Navigation Satellite System (GNSS)-derived position solutions are used
for crustal deformations for long-term monitoring studies such as correcting sea-level records for vertical land movements and to determine present-day surface-mass changes. In all these studies scientists rely heavily on precise International GNSS Service (IGS) products. In recent years the IGS products have partly been generated from a rigorous combination of GNSS, such as Global Positioning System (GPS) and Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) observations. Although combined solutions from two or more GNSS benefit from the diversity and redundancy of having more than one GNSS, the solutions are also subjected to system-specific systematic errors. Applications which demand high-accuracy products, therefore, would profit from evaluations of the benefits and error characteristics of combined GNSS solutions. In response to the increased availability of multi-GNSS observations from a truly global ground network of receivers, the goal of this thesis is to investigate their overall impacts on the derived products. Primarily, the impacts of combined GNSS data processing for stations in a constrained environment with a potential for signal obstructions, is investigated. The effects of signal obstructions on derived parameter time series and station velocity estimates are assessed. The benefits of combined solutions are evaluated for stations in constrained environments. Moreover, the study of the impacts of combined solutions on satellite orbits and station parameters contributes to the understanding of the error characteristics of combined GNSS data processing on derived products. The consistency of the parameters, noise analysis and system-specific periodic errors are assessed. Dominant system specific periodic errors and the impact of combined solutions on reducing the effects are addressed. Unmodelled or insufficiently modelled (sub-)daily errors propagate to longer periods and appear in high-end products coinciding with other longer periods, which in turn may lead to misleading interpretations of the latter. The propagation mechanism mainly depends, among other factors, on data sampling deficiencies and GNSS ground repeat periods. Here, the results of this study show that combined solutions not only reduce system-specific effects but also provide a means to identifying the sources from other compatible elements. | |
| University of Luxembourg: High Performance Computing - ULHPC | |
| Fonds National de la Recherche - FnR | |
| Researchers ; Professionals ; Students ; General public | |
| http://hdl.handle.net/10993/37191 | |
| FnR ; FNR6835562 > Kibrom Ebuy Abraha > MGLTM > Multi-GNSS Benefits to Long-Term Monitoring Applications in the Geosciences > 01/05/2014 > 30/04/2018 > 2013 |
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