Abstract
The Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS) aims at the data collection and analysis of all available satellite navigation systems. In particular the new global and regional satellite navigation systems are of interest, i.e., the European Galileo, the Chinese BeiDou, the Japanese QZSS as well as satellite based augmentation systems. This article analyzes the orbit and clock quality of the Galileo products of four MGEX analysis centers for a common time period of 20weeks. Orbit comparisons of the individual analysis centers have a consistency at the 5–30cm level. Day boundary discontinuities range from 4 to 28cm whereas 2-day orbit fit RMS values vary between 1 and 7cm. The accuracy evaluated by satellite laser ranging residuals is on the one decimeter level with a systematic bias of about −5cm for all analysis centers. In addition, systematic errors on the decimeter level related to solar radiation pressure mismodeling are present in all orbit products. Due to the correlation of radial orbit errors with the clock parameters, these errors are also visible as a bump in the Allan deviation of the Galileo satellite clocks at the orbital frequency.
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