Inside GNSS Media & Research

MAR-APR 2018

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Page 54 of 67 M A R C H / A P R I L 2 0 1 8 Inside GNSS 55 average reported device location can be used as ground-truth. e window over which the ground-truth-location is averaged varies based on the user activ- ity (e.g. standing, walking, running and driving). Multi-Frequency, Multi-Constellation The tools support multi-constellation (GPS , GLONASS , Ga l i leo, Bei Dou a nd QZ S S) a nd mu lt i-f re q u e nc y. Specifically, with the advent of L1L5 receivers for smartphones, v2.6.0.0 of the tools includes features specific to analyzing the quality of L5/E5 mea- surements. If L1/E1 and L5/E5 measurements are present, then the bar chart of C/N 0 shows both L1/E1 and L5/E5 signals, as well as the mean difference between L1 and L5. One of the challenges of imple- menting L5 in a phone is the L5 anten- na, and the tools show the presence and magnitude of any RF losses. Also, the pseudorange error plots show the group delay between signals on different fre- quencies. e skyplot and control panel also show which satellites signals have been tracked (e.g. L1,L5, or E1,E5a, etc). Mission Planner The tools include a Mission Planning feature, showing which satellites will be visible from any location at any time. In particular, the Mission Planner high- lights satellites with L5/E5 signals, so you can plan multi-frequency testing at appropriate times. For example, Figure 8 shows the Mis- sion Planner skyplot as viewed from Singapore for a 12-hour period. The GEO and IGSO satellites of BeiDou and QZSS have been selected from the con- trol panel. Receiver Test Report e tools provide automatic test reports FIGURE 7 Residual Plot View: With residual error analysis view the user is able to enter their ground-truth-location and observe the per satellite pseudorange and pseudorange-rate error over time. FIGURE 8 Mission Planner skyplot showing the sky view from Singapore for a 12-hour period. Note the Geostationary satellites of BeiDou, and the Inclined Geosynchronous satellites of BeiDou and QZSS with their characteristic "figure-eight" orbits. FIGURE 6 Signal Strength View: Shows real- time GNSS carrier-to-noise density ratio versus time for all visible satellites and constellations. The screen also shows the average average carrier-to-noise density ratio of the strongest 4 satellites and other carrier-to-noise summaries.

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