Workshop 2018
Arturo Villiger - Consistency antenna products in the MGEX environment - October 29, 2018 • 121 Views
Global Navigation Satellite Systems (GNSS) can typically not contribute to the scale of the terrestrial reference frame since the satellite antenna offsets are not a priori known to the scientific community and need to be estimated. In 2016, the European GNSS Agency (GSA) disclosed the satellite antenna calibrations for the Galileo In Orbit Validation (IOV) satellites. In November 2017, also the antenna corrections for the Full Operational Capability (FOC) satellites have been disclosed. With the second disclosure the antenna phase center offets (PCO) and phase center variations (PCV) for the full Galileo constellation are now publically available. In addition to Galileo, CAO has also released the satellite antenna calibrations for QZSS For the receiver antennas the situation is different. The IGS network consists of group calibrated receiver antennas based on dual frequency robot calibration. Since these calibrations include only GPS and GLONASS, no patterns for the second Galileo frequencies are available at the moment (the assumption that E1 is similar to L1 seems reasonable). Chamber calibrations from the University of Bonn include all frequencies covering a wide range of antennas used within the IGS/MGEX. After an IGS call for antenna chamber calibrations, many institutions provided their calibrations to this study. We present a dedicated study of the impact on the usage of the released Galileo satellite PCV and PCO on a global scale using IGS robot calibrations and chamber calibrations including E1 and E5. We will analyse their effect on the station coordinates introducing an inter-system translation vector between GPS and Galileo and on their impact for POD.

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