There are multiple different GNSS systems available for use in surveying today. In this thesis we present these systems in short, then study the effects of using one or multiple GNSS systems on positioning. We do that by analysing the observations of three permanently operating GNSS stations for intervals of various lengths. We analyse data such as the number of visible satellites, DOP factor values, the differences between calculated and reference coordinates and the standard deviations of calculated coordinates. Based on these analyses, we make conclusions regarding the effect of used GNSS systems on this data.
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