## 3 Results  
The descriptive statistics of the GNSS observations for the total bias and its components per coordinates in HTRS96/TM are presented in Table 2. CROPOS corrections produced the most accurate GNSS positioning in both repetitions, followed by the base station. The smaller deviation from the projected trajectory for these corrections was observed for N coordinates, as the trajectory had a higher range of E coordinates. Tested GNSS correction variants produced higher positioning accuracy in the first repetition characterized with the lower GDOP, with the exception of SBAS. While moderate variability of the CROPOS and base station observations was noted, SBAS produced the lowest CV values of the positioning bias in both repetitions, indicating the most consistent GNSS observation. The mobile device produced the least consistent observations, having a positioning accuracy range from sub-centimeter accuracy up to more than 3 m. A comparative visual representation of the deviations of the tested GNSS positioning variants from the projected trajectory is presented in Figure 5.  
Figure 4: Determination of GNSS positioning accuracy according to the projected trajectory. Figure 5: A comparative visual representation of deviations from the projected trajectory for four tested GNSS positioning variants. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**GNSS**} & \multicolumn{6}{c}{**First Repetition**} & \multicolumn{6}{c}{**Second Repetition**} \\  & **Corrections** & \(n\) & **Median (m)** & **CV** & **Min (m)** & **Max (m)** & \(n\) & **Median (m)** & **CV** & **Min (m)** & **Max (m)** \\ \hline \multirow{4}{*}{bias} & CROPOS & 50 & 0.019 & 0.604 & 0.003 & 0.043 & 50 & 0.029 & 0.511 & 0.002 & 0.052 \\  & Base station & 50 & 0.027 & 0.496 & 0.003 & 0.049 & 50 & 0.032 & 0.572 & 0.002 & 0.045 \\  & SBAS & 50 & 0.263 & 0.174 & 0.120 & 0.323 & 50 & 0.223 & 0.172 & 0.118 & 0.269 \\  & Mobile & 50 & 0.842 & 0.979 & 0.007 & 3.611 & 50 & 1.340 & 0.762 & 0.028 & 3.739 \\  & device & 50 & 0.015 & 0.671 & 0.000 & 0.035 & 50 & 0.023 & 0.538 & 0.001 & 0.045 \\ \(\Delta\)E & Base station & 50 & 0.022 & 0.542 & 0.001 & 0.041 & 50 & 0.016 & 0.647 & 0.000 & 0.036 \\  & SBAS & 50 & 0.212 & 0.199 & 0.066 & 0.264 & 50 & 0.179 & 0.190 & 0.096 & 0.222 \\  & Mobile & 50 & 0.581 & 0.803 & 0.003 & 1.788 & 50 & 1.006 & 0.759 & 0.024 & 3.358 \\ \hline \multirow{4}{*}{\(\Delta\)N} & CROPOS & 50 & 0.011 & 0.642 & 0.000 & 0.026 & 50 & 0.016 & 0.594 & 0.000 & 0.042 \\  & Base station & 50 & 0.016 & 0.513 & 0.002 & 0.033 & 50 & 0.012 & 0.577 & 0.000 & 0.028 \\  & SBAS & 50 & 0.155 & 0.154 & 0.097 & 0.207 & 50 & 0.131 & 0.187 & 0.069 & 0.183 \\  & Mobile & 50 & 0.548 & 1.334 & 0.007 & 3.536 & 50 & 0.815 & 0.933 & 0.014 & 3.170 \\  & device & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Descriptive statistics of the bias produced by the used GNSS RTK corrections from the projected trajectory. The null hypothesis of the Shapiro-Wilk test was rejected for all tested samples, indicating that neither pair of samples observed with the same GNSS correction possessed a normal distribution of values (Table 3). Accordingly, a non-parametric Wilcoxon statistical test was selected for the evaluation of all GNSS observation samples. The Wilcoxon test indicated that neither of the repetitions from respective GNSS corrections belong in the same population regarding the positioning bias and its components on E and N coordinates (Table 4). A display of the actual trajectories per GNSS correction and their relative location according to the projected trajectory is presented in Figure 6. The actual trajectories of all four GNSS variants were generally closer to the projected trajectory on straight sections, with the least matching on the most curved sections of the projected trajectory.