The launching of ASG-EUPOS system in Poland in May 2008 resulted in a significant increase in the use of satellite real-time measurements in surveying. The parameters provided by the GPS/GNSS receiver in the scope of quality of the determined position are mostly unreliable. Moreover, the concepts of precision and accuracy are frequently not distinguished in their meaning and used as synonyms. The paper presents the results of the analysis of precision and accuracy in determining position in Real Time Network measurements using NAWGEO service of ASG-EUPOS system. An important aspect of the applied testing technology was the design of test point location and the use of accurate ground-based measurements for quality control of the reference coordinates of test points, which were calculated from the GPS static measurements. The conclusions from the tests were based on 4475 RTN measurements carried out in 149 test runs on 27 test points. Based on the results of the test measurements, high precision of the determined positions of the points in the RTN measurements was identified. However, their accuracy was significantly lower, particularly for the determined heights of the points. Tendencies were observed to obtain solutions with a few-centimeter biases that limit the possibility ...
This paper shows contents of analyses regarding the adjustment of the classic 3rd class horizontal geodetic network integrated with GNSS measurements in the ASG-EUPOS system. The tests were carried out on two regular theoretical models with similar parameters of reference points density and the network side length, but with different geometric structures in terms of shape and travers length. ...
The paper presents the method of testing the precision and accuracy of satellite measurements made with the Trimble NetR9 receiver model with a Zephyr Geodetic Model 2 antenna (TRM55971.00 TZGD), which was additionally equipped with a snow shield. The tests covered the results of static measurements in the form of geocentric coordinates XYZ, calculated with the automatic POZGEO service, operating under the ASG-EUPOS system. The observations were made in measuring sessions of 1h, 2h, and 3h. The statistical tests were conducted to check if the distributions of their errors correspond to normal distribution, which would determine the accuracy of the performed test calculations and measurements, and consequently the usefulness of the tested satellite receiver in geodetic surveys. The correctness tests of the executed measurements and calculations applied three statistical tests: the parametric test, the D' Kolmogorov statistic, and the V and V' Kuiper statistics. The conducted analyses and studies provided conclusions on the correctness of the survey and calculation results and the usefulness of the tested measurement system in the execution of various geodetic operations. ...
