1. Reprocessing CEGRN campaigns 1994-2006 M. Becker(1), A. Caporali(2), R. Drescher(1), L. Gerhatova(5), G. Grenerczy(3), C. Haslinger(4), J. Hefty(5), S. Krauss(4), T. Liwosz(6), G. Stangl(7) (1) Institute of Physical Geodesy, Darmstadt University of Technology, (2) Università di Padova, Dipartimento di Geologia, Paleontologia e Geofisica, (3) Institute of Geodesy, Cartography, and Remote Sensing (FOMI), Budapest, Hungary, (4) Space Research Institute, Austria, (5) Department of Theoretical Geodesy, Faculty of Civil Engineering, Slovak University of Technology, (6) Institute of Geodesy and Geodetic Astronomy, Warsaw University of Technology, (7) Federal Office of Metrology and Surveying, Austria

2. EGU Vienna 2007 G11 Overview  CEGRN (Central European Geodynamic Research Network) intended for long-term investigations of tectonic movements in Central Europe  Campaigns 1994, 1995, 1996, 1997, 1999, 2001, 2003, 2005, (2007) -, 5-7 days each  30 – 90 sites observed, permanent and epoch  Quality check of each site (stability, environment)  Measurements available at the CERGOP data centre  Results from different analysis centres  Old processing strategies following old EPN standards  Switch to new international strategy necessary

3. EGU Vienna 2007 G11 New Strategy  Bernese Software 5.0  IGS orbits and EOPs reprocessed from Munich/Potsdam/Dresden (Old ITRF94-ITRF2000)  ITRF2005 coordinates and velocities as reference (12 sites)  Absolute calibration values for antennas (Old relative)  Zenith path delay mapping function wet Niell (Old dry Niell or Saastamoinen or none)  Minimum elevation 5° (Old 10°)  2 horizontal gradients/day for zenith path delay (Old none)  Minimum constraint solution on ITRF2005  6 analysis centres will contribute solutions

4. EGU Vienna 2007 G11 Present Status  OLG processed campaigns 1994-2005  OLG 1994 re-reprocessing considered (no model of the ionosphere, baselines too long with strategy OBSMAX, ambiguity fixation rate only 80%, strategy SHORTEST or combination considered)  TUD 1994 ready, several variations (see Poster)  SUT 2006 ready, others delivered within 1-2 months  All other contributions pending  Comparison OLG-TUD 1994: most differences below 1 mm, two large (10-20 mm) differences at DISZ and SKPL  Already improvement to old solution w.r.t. daily repeatability  Most outliers result from observations <6 hours (start and stop days)  As expected differences in height up to 20 mm (baselines with minimum elevations 5-10 degrees)

5. EGU Vienna 2007 G11 Thank you!