Workshop 2018
Inga Selmke - Status of the TUM MGEX orbit and clock products - October 29, 2018 • 35 Views
The Technical University as member of the Center of Orbit Determination in Europe (CODE) is providing Multi-GNSS orbits and clocks for the MGEX Pilot Project. The orbits are generated using zero-differences phase and code observations. First, GPS CODE rapid orbits and clocks are used in an initial PPP. In the following step the coordinates, troposphere estimates and GPS receiver clocks are fixed and the GNSS satellite orbits and clocks are estimated and later combined on the normal equation level to a long-arc solution. The orbit and clock products cover Galileo, QZSS and most recently BeiDou-2 MEO and IGSO satellites. The published metadata of QZSS and Galileo IOV and FOC satellites were partially included. An estimation method of QZSS and BeiDou box-wing parameters was validated using the published optical properties of Galileo satellites. With the use of the estimated a priori box-wing parameters, the orbits for QZSS satellites were able to be improved, whereas there was no large impact on the more cubic-shaped BeiDou MEO and IGSO satellites. Further influences on the orbits were also investigated, e.g. antenna thrust. The presentation will give a summary of the current status and developments of the TUM MGEX products.

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