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Uwe Feldmann-Westendorff [06-2012]:

Divergenz globaler und kontinentaler Bezugssysteme – Auswirkungen auf die hochgenaue GNSS-Positionsbestimmung im ETRS89

Diese Arbeit ist online verfügbar: Download


The introduction of the ETRS89 occurs in an increasing number of European countries within the context of the INSPIRE-Initiative. The goal is that all spatial related data in Europe is referenced to a unique reference system. Point locations in a global reference frame are subject of plate tectonic and are contrary to the familiar view of users time variant. For that reason, EUREF decided in a resolution on ETRS89 in 1990, that the reference system coincides with ITRS of epoch 1989.0 and to fix it to the stable part of the Eurasian continental plate. The use of global reference frames is essential for satellite-based positioning and navigation with GNSS. Results of both absolute and relative position determination of all kind of accuracies refer originally to the satellite's reference system. Progress in measurement techniques and processing models as well as the modernization and establishing of GNSS lead today to significant increase of accuracy in the realization of reference systems. Therefore, deficiencies of the ETRS89 definition become more obvious through availability of IERS and also through positioning services. One reason for this is the increasing divergence between ETRS89 and the reference frames of the ITRS due to the drift of the Eurasian plate of about 25 mm/year in Central Europe. This is complicated further by large scale intraplate deformations in Scandinavia and in the Mediterranean area. RTK positioning services generally refer their GNSS reference station coordinates to the ETRS89, which are transferred a priori to the satellite’s reference system to remove inconsistencies with the actual ITRF. The real-time networking processing transforms the correction data models into observation space in that way, that the user can directly perform positioning in ETRS89. The present Master Thesis supports the position that this workaround will led to a steady and growing impact on RTK positioning. A simulation model has been developed for verification, which allows time and space dependent analysis based on field test data sets. The results are summarized empirically with approximate formulas. The extension of the open Standard RTCM 3.1 is one possible approach for a solution. Its realization requires that positioning services and future reference coordinates are based on ITRF and that ETRS89 is obtained by transformation parameters.


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