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The Geodesy Group of the BKG (Federal Agency for Cartography and Geodesy) has been involved in IVS analysis and combination activities for many years. It successfully operates an IVS Analysis Center (using NASA’s software packages νSolve and Calc/Solve) and the IVS combination centre (using the DFGI-TUM software package DOGS CS). BKG also operates an ILRS analysis center and is a partner in the CODE consortium, which operates the IGS analysis center CODE at the AIUB (Astronomical Institute of the University of Bern). Both analysis centers are using the Bernese GNSS Software, which is developed by AIUB and continuously adapted to changing requirements and user needs. Currently, BKG uses different software packages for different space-geodetic techniques. However, our focus is not only on the individual techniques, but also on the combination of the different observation techniques, in particular to improve the Earth rotation parameters. We would like to continue the multi-technique combined analysis using a single software package, namely the Bernese GNSS Software. Ultimately, this will allow us to combine GNSS, VLBI and SLR data not only at SINEX level, but also at the observation level in the near future. We present the current status of the Bernese GNSS Software enhancements for the analysis of VLBI data. We also compare the results of the VLBI data analysis derived from Calc/Solve with those derived from the Bernese GNSS Software. For the latter we use the unconstrained normal equations from Calc/Solve as input and discuss different options for constraining station and quasar coordinates. |
