Inside GNSS Media & Research

SEP-OCT 2018

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52 Inside GNSS S E P T E M B E R / O C T O B E R 2 0 1 8 MEASURING G ALILEO PERFORMANCE FIGURE 16 PVT results from Galileo Experimental Sensor Stations (GESS) June 2018 80 60 40 20 0 -20 -40 -60 -80 0 –50 –100 –150 50 100 150 FAA1 HACC: 2.7 VACC: 5.8 GUSN HACC: 3.2 VACC: 5.5 GKOU HACC: 2.2 VACC: 4.3 GPTB HACC: 2.1 VACC: 3.0 GKIR HACC: 2.7 VACC: 4.7 GIEN HACC: 1.9 VACC: 3.2 GNOR HACC: 3.2 VACC: 4.0 GMAL HACC: 2.5 VACC: 4.4 GWUH HACC: 2.7 VACC: 4.8 GMIZ HACC: 2.3 VACC: 3.7 GNNO HACC: 2.8 VACC: 4.8 GOUS HACC: 9.0 VACC: 4.3 GVES HACC: 2.7 VACC: 4.8 FIGURE 18 Example of smartphone vehicular test performed during the Galileo App competi- tion 28th May 2018 (RTK reference trajectory in green) navigation system (SPAN) integrated in ESA's Navigation Testbed Vehicle. is was one of the tests conducted in May 2018 in the frame of the Galileo App 2017/2018 competition, involving Young Graduate Professionals (YGT), trainees, and students at ESA. e challenge was to design an Android smartphone app allowing users to compute and visualize their position based on Galileo measure- FIGURE 17 GESS PVT Horizontal and Vertical positioning error (29th June - 2nd July 2018) 20 15 10 5 0 –5 –10 –15 –20 0 –5 –10 –15 –20 5 10 15 20 Horizontal Error WE (meters) Time Horizontal Error NS (meters) 20 15 10 5 0 –5 –10 –15 –20 06/29 00:00 06/29 12:00 06/30 00:00 06/30 12:00 07/01 00:00 07/01 12:00 07/02 00:00 Vertical Error (meters) ments only, as well as the possibility of selecting a combination of GNSS con- stellations to assess their performance (see Additional Resources). Conclusions Galileo has been in use since December 15, 2016 with in-field-proven perfor- mance. e main system performance trends have been shown in this article, from ranging and timing accuracy to system availabilit y and positioning accuracy. ESA's key assets for system monitoring and troubleshooting have been presented. e results are fully in line with the Minimum Performance Levels (MPLs) established in the Galileo Open Service Definition Document. e GNSS user community can be confident that Galileo is working nominally and is well on track toward Full Operational Capability. Acknowledgments The authors would like to thank the European GNSS Agency (GSA) and the European Commission for the continu- ous cooperation on the definition, engi- neering, and monitoring of the Galileo services. In addition to the teams from ESA Directorate of Technology, Engineering and Quality (TEC), and Directorate of Navigation (NAV), the authors would also like to acknowledge the contribu- tions of the industrial teams involved in the support and development of the facilities mentioned in the article: 1. TGVF team led by GMV Spain, in particular the Operations Team at the ESTEC Galileo Processing Centre 2. Galileo System Performance Team at Airbus Defence & Space in Ottob- runn, Germany 3. ales Alenia Space in Rome, Italy and the Galileo System Engineering Technical Assistance (SETA) subcon- tractors Additional Resources [1] An Analysis of GPS SPS Performance for 2017, The University of Texas at Austin, 2017 [2] Breeuwer, E. et alia, "Galileo Works! Results of the Galileo In-Orbit Validation Test Campaign," Inside GNSS, March/April 2014

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