Abstract
Analysis of the official EUREF (European reference GPS network) weekly solution series reveals some systematic seasonal errors, especially in the height component. We suspect that the standard fiducial processing strategy causes these errors. In this investigation a non-fiducial strategy has been used to process a subnetwork of 21 EUREF stations for GPS weeks 969–1042: free weekly solutions obtained as Helmert-based combinations of daily solutions followed by Helmert transformation to ITRF97. Bernese, PyGPS and GROSS packages were used. Comparison with the official EUREF solution shows that obtained coordinate time series most likely are free from seasonal errors. The authors consider it important for such a solution to accompany the official one. A comparison of EUREF and VLBI solutions is planned.
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