Performance of 24h static Precise Point Positioning (PPP) solutions based on multi-GNSS precise satellite orbit and clock products from four analysis centers and seven various constellation combinations was studied to evaluate their quality and characteristics. Data from ten European and four Chinese GNSS stations and 152 days long period from year 2020 were processed. Obtained coordinates were firstly compared with those provided by IGS final weekly combined solution. In Europe, the best agreement with this reference product was reached by solutions including Galileo signals, namely by a combination of GPS+GLONASS+Galileo systems with a mean RMS of 11 mm. This situation was different in China where inclusion of Galileo always led to worse results and the best agreement was achieved by a combination of GPS+GLONASS systems. Although product provided by German Research Center for Geosciences (GFZ) could be selected as the best performing over Europe and product by Center for Orbit Determination in Europe (CODE) over China, differences between individual precise products were mostly at a minimal level. Secondly, coordinates repeatability over the processed period was computed in order to assess the positioning stability. In this regard, the lowest values in both horizontal and vertical direction were reached by GPS+GLONASS solutions. From the perspective of precise products, the repeatability results were dependent on the selected constellation where mainly a specific behavior of product from Wuhan University (WUM) for Galileo system was observed.
Performance of the Precise Point Positioning (PPP) technique for GNSS positioning is strongly dependant on a quality of used satellite orbit and clock product. Within this study, three different versions of precise products provided by the analytical centre of the Wuhan University were evaluated by processing various combinations of GNSS systems constellations over a five months long period in 2020 with RTKLIB software. The results show that final and rapid version of the precise products could offer a centimetre level of positioning accuracy in static daily PPP while the ultra-rapid version utilizing 24 hours of predicted products performed significantly worse. In this regard, a positive effect on positioning accuracy was reached when including Galileo signals in processing of the ultrarapid version product. When studying coordinate's repeatability over the selected time period, the best results were obtained for a combination of GPS and GLONASS signals.
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