[G01-P] Poster

[G01-P-02] Impact of different TRF station coordinate parameterizations on VLBI combined EOP

Sabine Bachmann, ^○Daniela Thaller (Federal Agency for Cartography and Geodesy (BKG), Germany)

In the framework of the realization of the latest International Terrestrial Reference System, different solutions using different TRF station coordinate parameterization have been published. Namely, the DTRF2014, published by the German Geodetic Research Institute (DGFI-TUM), using a piece-wise linear station model with improved geophysical modeling, the ITRF2014, the official ITRF, using a piece-wise linear station model and an additional post-seismic deformation model, and the JTRF2014, published by Jet Propulsion Laboratory (JPL), using weekly estimations of station coordinates (epoch reference frames).
The combination on the normal equation level of EOP and station coordinates is well established within the International VLBI Service for Geodesy and Astrometry and in cooperation with other space geodetic techniques (e.g. inter-technique combined TRF). In the combination process, the estimation of accurate a priori values for station coordinates plays an important role for the estimation of combined Earth Orientation Parameters (EOP). In our study we compare the impact on the routinely combined VLBI EOP by using the three different TRF solutions for a priori station coordinate estimation. The results of this study and the comparisons of the different solutions will be presented.