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The paper deals with the problem of the reliability of reference systems realized by the permanent GNSS (Global Navigation Satellite System) networks. The GNSS technique is used for realization of global reference system ITRS (International Terrestrial Reference System), (e.g. ITRF2008 – International Terrestrial Reference Frame) and European reference system ETRS89 (European Terrestrial Reference System), (ETRF2000 – European Terrestrial Reference Frame). In 2012 Polish government introduced the PL-ETRF2000 frame, which is realized in practice by the selected number of EPN (EUREF Permanent Network) stations. There are also some accuracy criteria (0.01 m for horizontal position and 0.02 m for vertical component) related to the role of ASG-EUPOS (Active Geodetic Network – European Position Determination System, Polish GBAS (Ground Based Augmentation System)) as the fundamental and base geodetic networks. In the frame of ASG+ project (“The supporting modules for ASG-EUPOS system real-time services”) coordinates monitoring module has been developed. Its main goal is to investigate the reliability of instantaneous ASG-EUPOS coordinates obtained using various IGS products (final, rapid, ultra rapid) by comparing them to the reference values. The paper focuses on the method of final solutions determination as they are the most reliable ones and which delay (about 2 weeks) is acceptable for reference frame monitoring purpose. This fully automatic module enables analysis of instantaneous and archive coordinates to estimate the stability of each station’s position and the reliability of the whole reference frame. As the independent element the graphical presentation serves. This can be found at the web page of the Centre of Applied Geomatics (CAG) at www.cgs.wat.edu.pl. Despite the fact that the module has been developed for Polish national system, its construction is general and could be used for monitoring of other GNSS networks.

Monitoring of long-term changes in GBAS daily solutions for the maintenance of the Polish reference frame