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According to the newest Polish regulations multifunctional system of precise positioning ASG-EUPOS serves as the fundamental network and constitutes reference frame as well. The permanent GNSS observations gathered within the network are processed and analysed by the Centre of Applied Geomatics of Military University of Technology, which is one of the EPN Local Analysis Centres. IGS and EUREF recommendations are included. Weekly solutions are being stacked and, as the result, cumulative solution (coordinates expressed at the specified epoch and velocities of all stations) by using the CATREF software and minimal constraints approach is determined. Its reliability increases with the number of reference (sometimes described as fiducial) stations. According to the EUREF guidelines, reference stations have to belong to the EPN A class, but their geographical layout leaves much to be desired. The authors made several numerous tests using different configuration of reference stations to transfer ETRF2000 frame into Poland area, and to choose the best strategy of ASG-EUPOS alignment to the EPN. Eight different variants of ASG-EUPOS processing were investigated and each time the different set of coordinates was obtained. The differences reached several centimetres. The spatial distribution of the results on the area of Poland was shown and the optimum solution was pointed out. Furthermore, the analysis on the Helmert transformation parameters from individual TRF to the reference network were performed. These parameters do not have any geophysical interpretation, but provide very useful information about solution's consistency and compliance.

Configuration of the reference stations as the element of national reference frame reliability