Analysis of RTN measurement results referring to ASG-EUPOS network

In June 2008 ASG-EUPOS network system, implemented within the European project called European Position Determination System, was made available to users in Poland. For surveyors an interesting product of the ASG-EUPOS network system appears to be the NAWGEO service, whose accuracy in determining horizontal coordinates of points was defined as not worse than 3 cm and the accuracy in determining the heights as not worse than 5 cm, with a confidence level of 99.9% [6]. The main objective of this work is to verify this information. For this purpose, RTN measurements (Real Time Networks) were conducted, with the use of the RTCM 3.1 protocol as, until that moment, it was the protocol used by most users (81%), according to statistics provided in [6]. An important aspect of the applied testing technology was a project of test points location as well as the use of precise terrestrial surveys to control the quality of the reference coordinates of the test points, calculated from GPS static surveying. In case of using precision instruments for terrestrial surveying, it is possible to obtain accurate measurements of distance and height of less than 1 mm. The conclusions from the tests were based on the 4475 RTN measurements of 27 points.