《Table 1Fixed solution position accuracies.》

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《"Assessment of positioning performances in Italy from GPS, BDS and GLONASS constellations"》

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The post processed accuracies are mostly similar to the RTK results with millimeter accuracy obtained for most cases as seen.The discrepancy in the 5 min observation of GPS-BDS data indicates a number of false fix in the initial solutions.Hence the false fixes which skewed the accuracy which can be seen in the high standard deviation of the 5-minute period in Table 2 as well.Across the 24 h period，the GPS-GLONASS solutions were marginally better，but it could not obtain a fix solution in the 5 min observation period.However，it has been seen that at different 5-minute intervals across the day，GPS-GLONASS was able to acquire a fixed solution，sometimes in less than a minute as well.The percentage of fixed solutions naturally goes up in the post processed solution.Overall the performance of GPS-BDS slightly worsened in the post processed solutions when compared to RTK while the performance of GPS-GLONASS remained comparably the same.