Consistent dynamic satellite reference frames and terres-trial geodetic datum parameters

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The aim of the project is the realization of high-precision dynamic reference frames by exploiting the strengths of the available GNSS, SLR and DORIS observations to individual and commonly observed satellites that are characterized by different orbit heights, inclinations and tracking techniques. The focus of the work is the improved realisation of the global geodetic datum as well as on the development of novel concepts for the datum definition of the terrestrial reference frames. Compared to the previous project, in particular low Earth orbiting satellites observed by at least two techniques will be included. These type of satellites act as moving co-location sites and provide observations with very different and changing observation geometries. Thus, combined orbit determination will strengthen the reference frame solution significantly and it is expected that the sensitivity of the solution with respect to the geodetic datum parameters will increase strongly. Complementary simulation studies are performed in order to realize and assess satellite and station configurations which are very sensitive to the datum parameters. Simulations allow it in addition to investigate new orbit and observation types. The contribution of geosynchronous navigation satellites as well as DORIS phase observations and precise inter-satellite ranging links between navigation satellites to the stability of the reference frame will be investigated with extended simulations. The outcomes of the project are epoch and long-term reference frames with a datum realization of the highest accuracy which can be reached today. Furthermore, recommendations will be made, how the datum realization of the terrestrial reference frames can be improved in future by new satellite missions and optimised observing station networks but also by using new observation types.