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Tobias Nilsson
Type of contribution: poster

Combination of common parameters for co-located VLBI antennas

Tobias Nilsson, GFZ German Research Centre for Geosciences Robert Heinkelmann, GFZ German Research Centre for Geosciences Susanne Glaser, TU berlin Benedikt Soja, GFZ German Research Centre for Geosciences Maria Karbon, GFZ German Research Centre for Geosciences Harald Schuh, GFZ German Research Centre for Geosciences

There exist VLBI stations equipped with more than one antenna and several more are planned. With the upcoming VGOS there will be various new twin telescopes. When analyzing observations from VLBI sessions containing co-located antennas it is possible to combine the station coordinates and tropospheric parameters in the VLBI data analysis, and if the antennas are connected to the same atomic clock it is possible to estimate common clock parameters as well. This should theoretically lead to more precise results. In this work we investigate the possibility of combining common parameters for the co-located antennas with a special emphasis on the clock parameters. To do this we use data from the CONT14 campaign, where two co-located antennas observed at the Hobart station. We also carry out simulations of a future VGOS network of about 20 stations containing several twin telescopes. In the simulations we consider different cases for the clocks, i.e. that the clocks are truly identical or that there are small systematic or random differences between them caused by e.g. uncalibrated cable delays.