Galileo HAS testing with LabSat 3 Wideband

Our objecive was to test the status of Galileo HAS (High Accuracy Service) with the LabSat Wideband Record and Replay System. We also wanted to test the new Tallysman E6 antennas.

The tests we ran with the LabSat 3 Wideband were very successful with the latest antenna from Tallysman. We recorded a test drive with the LabSat 3 Wideband on L1, L5 and E6. We then replayed the recording into two different HAS capable receivers; The EOS Arrow Gold Plus and the Hemisphere Atlas development receiver. Note that both these systems have development firmware installed. The new Tallysman antenna SSL990XF worked perfectly. In fact, beter than one of the OEM antennas.

We replayed the recorded scenario into both receivers and obtained a track from each about 3cms apart.
Figure

Figure 1: LabSat Wideband Test Drive
Figure 2: Close up Test Drive

The wideband recording was played into the EOS Arrow Gold Plus receiver and then Hemisphere OEM receiver board, and the results ploted in Google Earth Pro. Using the Racelogic VBOX Test Suite So􀅌ware we can create a close up Graph showing the separa􀆟on of the two Replays.

This shows the repeatability of the LabSat scenario recording and the accuracy of the Galileo HAS signals.

Figure 3: VBOX Test Suite Close Up

You can see from the scale of the graph the distance between the two lines is about 3cms. Taken that all the systems used in the test are in development stages apart from the LabSat 3 Wideband. The results prove the repeatability of the LabSat System.

The Galileo HAS signals are in phase two of three. Currently the HAS signal does not have the full capability of the GNSS signals.

Figure 4: European GNSS Service Centre HAS roadmap

The HAS Service Levels are quoted as:

Figure 5: Galileo HAS Service Levels

The accuracy of the HAS signal on the EOS Arrow Gold Plus System is shown below:

Figure 6: EOS HAS Results Display
Figure 7: EOS HAS Results Display
Figure 8: Static Test Location

As you can see the horizontal accuracy With GALHAS fix is about 10cms well below the 20cms system accuracy quoted on the official horizontal signal levels in Figure .5.

The main issues currently with the HAS signals are receiver availability and extended convergence 􀆟mes. The receiver availability will improve once the system reaches service level 2 and the convergence 􀆟me will significantly improve with the introduc􀆟on of full code and phase in the signals.

Mark Sampson
Sampson Technology Ltd
January 2024