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Recent years have brought rapid development of GNSS and supplementary SBAS and GBAS systems. Depending on the needs of a given real-time positioning domain, users can obtain several meters (GNSS + SBAS) or several centimeters (GNSS + GBAS) accuracies. Active (local) geodetic networks belonging to GBAS, through the permanent nature of the work and constant satellite observations recording, allow achieving even greater accuracies through post-processing elaboration. The paper presents in a uniform manner the charact...