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Linda Messerschmitt
Type of contribution: poster

IVS Combination Center at BKG: Combination products and the IVS contribution to ITRF2014

Linda Messerschmitt, Federal Agency for Cartography and Geodesy Sabine Bachmann, Federal Agency for Cartography and Geodesy Daniela Thaller, Federal Agency for Cartography and Geodesy

The IVS Combination Center is the central location for consolidating analysed VLBI data. This data is combined in a rapid and a quarterly operational mode. Every submission of the Analysis Centers has to be synchronized and prepared for the combination. The process comprises a quality control with format checking and detection of outliers for each contribution. Recently, two additional Analysis Centers (ACs) CGS (Centro di Geodesia Spaziale, Italy) and GFZ (German Research Centre for Geosciences, Germany) are under review for the operational rapid and quarterly combination. Including both ACs increases the number of operational contributions to eight institutions. The final combination products are estimated Earth Orientation Parameters (EOP), station coordinates, and a terrestrial reference frame (VTRF). The Earth Orientation Parameters are released as official IVS products. In March 2013 a call for participation for the next ITRF was sent out to the IERS Technique Services. For the IVS combined solution, a total number of eleven Analysis Centers prepared their contributions for the time span 1979 to the end of 2014. The files have to meet the IVS specifications to be included into the combined solution. The contributions in form of datum-free normal equations are provided in SINEX format containing station coordinates and EOPs, so that long-term series systematic changes and errors can be identified. The series are created by using the orbit and geodetic parameter estimation software(DOGS-CS) of the German Geodetic Research Institute/Technical University of Munich. The computation of the combined IVS contribution, in form of stacked normal equations, to the upcoming ITRF2014 was successfully finished in February 2015. The results of the operational as well as the ITRF analysis will be presented in our poster.