Assessment of multi-GNSS precise orbit and clock products from different analysis centers based on precise point positioning

Performance of 24h static Precise Point Positioning (PPP) solutions based on multi-GNSS precise satellite orbit and clock products from four analysis centers seven various constellation combinations was studied to evaluate their quality characteristics. Data ten European Chinese GNSS stations 152 days long period year 2020 were processed. Obtained coordinates firstly compared with those provided by IGS final weekly combined solution. In Europe, the best agreement this reference product reached including Galileo signals, namely a combination GPS+GLONASS+Galileo systems mean RMS 11 mm. This situation different in China where inclusion always led worse results achieved GPS+GLONASS systems. Although German Research Center for Geosciences (GFZ) could be selected as performing over Europe Orbit Determination (CODE) China, differences between individual mostly at minimal level. Secondly, repeatability processed computed order assess positioning stability. regard, lowest values both horizontal vertical direction solutions. From perspective products, dependent mainly specific behavior Wuhan University (WUM) system observed.