Reprocessing of a Regional GPS Network in Europe

The Bavarian Committee for International Geodesy (BEK) has been a Local Analysis Centre (LAC) for the EUREF Permanent Network (EPN) since 1995. The analysed network covers the northern part of the Mediterranean region with its diverse tectonic features. The processing strategies, the realizations of the global reference system and models for correcting different physical effects have been improved and changed during the past 10 years of analysing GPS data. All these modifications had a significant impact on the coordinate estimation. It is therefore not surprising that time series of coordinate changes always reveal such modifications and may hide tectonic events. A group from the Technische Universitat Munchen (TU Munich), Technische Universitat Dresden (TU Dresden) and the GeoForschungsZentrum Potsdam (GFZ Potsdam) made an effort to reprocess a global GPS network to derive consistent coordinates of stations as well as orbits and earth rotation parameters (ERPs) in the IGb00 applying absolute antenna phase centre variations (PCV) for the antennas. The reprocessed orbits and ERPs have been used at the BEK for a reprocessing of 10 years of GPS data, using a network of roughly 65 sites. This paper will focus on the improvement achieved by applying consistent products, strategies and models