Contribution to EUREF of the ASI (Agenzia Spaziale Italiana) Matera Space Geodesy Centre "G. Colombo"

Within the space geodesy analysis activities performed at ASI-CGS, a predominant role is played by the geodetic research and products devoted to the Terrestrial Reference Frame realization: global and regional geodetic products, based on the three space geodesy techniques hosted by CGS (SLR, VLBI, GPS) are regularly submitted to the geodetic international organizations (IERS, ILRS, IVS, IGS). In particular, ASI CGS has been contributing to EUREF since 1996, starting with weekly coordinate solutions of a network of seven permanent GPS receivers, distributed in Italy, Spain and Germany. Since then, the contribution has been growing in the years both in terms of number of analysed sites (twenty-two up to now) and of data products; moreover, following the evolution of the EUREF objectives, at present ASI-CGS submits regularly not only coordinates but also tropospheric zenith delays. ASI-CGS is actively participating to two EUREF special projects: "EUREF Permanent Network Time series monitoring" and "Troposphere Parameter Estimation". A general overview on the activities developed in seven years of collaboration have been described in this work.