## 5 Smartphone Positioning Results
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Minutes** & **dx (m)** & **dy (m)** & **dh (m)** \\ \hline
0–15 & \(-\)0.281 & 0.057 & 0.545 \\ \hline
15–30 & 0.002 & \(-\)0.010 & \(-\)0  
Using RTKLib GNSS software, we prepared a skylplot covering the GPS satellites tracked by the Huawei P30 Pro (Figure 16). In the last positioning test, which took place on 23 January, the Huawei P30 Pro was placed horizontally on an aluminum beam. Session time was also 60 min and started at the same time as the day before. Similarly, we mounted the Javad Alpha geodetic receiver at the same place. Static coordinate results were also computed based on carrier phase observations obtained from the OPNT permanent station and compared to the reference position. Again, we subdivided the observation data into sessions of shorter duration. Based on previous experience, GPS-only L1 carrier phase observations where used to process collected data in Topcon Tools post-processing software. Unfortunately, in the case of the 10 min sub-session, all the ambiguities were float. The same problem occurred in 15 min and 20 min sessions. Only for 30 and 60 min sessions were ambiguities fixed. During this 60 min surveying session, the number of observed GPS satellites did not drop below 6, and the average number was the same as before (8 satellites). Results of this experiment are presented in Figures 17-21 and Tables 11-15 below. Figure 19: 20 min sub-session positioning results for the third test, baseline OPNT–P30 Pro (4 km). Figure 20: 30 min sub-session positioning results for the third test, baseline OPNT–P30 Pro (4 km). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Minutes** & **dx (m)** & **dy (m)** & **dh (m)** \\ \hline
0–20 & 0.007 & 0.015 & 0.007 \\ \hline
20–40 & \(-\)0.036 & \(-\)0.357 & \(-\)0.146 \\ \hline
40–60 & \(-\)0.042 & \(-\)0.120 & \(-\)0.040 \\ \hline min & \(-\)0.042 & \(-\)0.357 & \(-\)0.146 \\ \hline max & 0.007 & 0.015 & 0.007 \\ \hline SD & 0.027 & 0.188 & 0.078 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: 20 min sub-session positioning results summary, baseline OPNT–P30 Pro (4 km). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Minutes** & **dx (m)** & **dy (m)** & **dh (m)** \\ \hline
0–10 & 0.139 & \(-\)0.310 & \(-\)0.291 \\ \hline
10–20 & \(-\)0.068 & \(-\)0.384 & \(-\)0.048 \\ \hline
20–30 & 0.268 & \(-\)0.713 & \(-\)0.287 \\ \hline
30–40 & \(-\)0.121 & \(-\)0.237 & \(-\)0.057 \\ \hline
40–50 & \(-\)0.066 & \(-\)0.285 & \(-\)0.012 \\ \hline
50–60 & \(-\)0.071 & \(-\)0.128 & 0.082 \\ \hline min & \(-\)0.121 & \(-\)0.713 & \(-\)0.291 \\ \hline max & 0.268 & \(-\)0.128 & 0.082 \\ \hline SD & 0.154 & 0.200 & 0.153 \\ \hline \hline \end{tabular}
\end{table} 
Table 11: 10 min sub-session positioning results summary, baseline OPNT–P30 Pro (4 km). Figure 21: 60 min session positioning results for the third test, baseline OPNT–P30 Pro (4 km). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Minutes** & **dx (m)** & **dy (m)** & **dh (m)** \\ \hline
0–15 & 0.018 & 0.011 & 0.021 \\ \hline
15–30 & 0.119 & \(-\)0.624 & \(-\)0.322 \\ \hline
30–45 & 0.015 & \(-\)0.286 & \(-\)0.161 \\ \hline
45–60 & \(-\)0.011 & \(-\)0.024 & \(-\)0.028 \\ \hline min & \(-\)0.011 & \(-\)0.624 & \(-\)0.322 \\ \hline max & 0.119 & 0.011 & 0.021 \\ \hline SD & 0.057 & 0.294 & 0.154 \\ \hline \hline \end{tabular}
\end{table} 
Table 12: 15 min sub-session positioning results summary, baseline OPNT–P30 Pro (4 km). The Huawei P30 Pro GPS-only skyplot for the third experiment is presented in Figure 22.