GALILEO NAVIGATION MONITORING CNES Bernard Bonhoure & Co CNES GSA Webinar, 3 March 2021 CNES NAVIGATION MONITORING ACTIVITIES • Early CNES monitoring of Galileo performances since first PVTs in 2013 and contribution to IOV • From 2016, Initial Services performance monitoring • From 2018 Quarter 4 GRC-MS contract with GSA, CNES is: • The leader of the GRC-MS consortium (20 public entities) • The OS navigation performance assessment WP leader with NMA, SRC & GOP as partners • The OS timing assessment WP leader • The orbit and clocks products WP leader • Providing a set of GNSS reference stations • Providing quarterly performance reports 2 MAIN KPI ASSESSED FOR NAVIGATION • Positioning error ͌ Ranging error * Dilution of Precision • KPIs assessed are, • SIS Error for ranging, equivalent to GPS URE • Satellite availabilities in healthy status • PDOP<6 mean availability worldwide, as for other GNSS • Monthly horizontal and vertical positioning accuracies at 95% for some stations, for Galileo only and Galileo & GPS 3 CNES MEANS - INDEPENDENT CAPACITY FOR KPIs • Worldwide REGINA CNES/IGN receiver network • IGS stations with full GNSS Open Signals support • Standard RINEX data, but also real-time RTCM and raw data for advanced assessment (HAS in future etc…) • IGS Precise Ephemerides from CNES/CLS IGS Analysis Centre, CODE products in back-up (based on IGS network) • DCBs from CAS (China, CNES source in future) • Stations coordinates from ITRF if available • CNES operational Navigation and Timing Monitoring Facility (NTMF) with daily and monthly monitoring products • KPIs methods and algorithms as per SDDs 4 CNES / IGN REGINA NETWORK A CNES – IGN partnership for GNSS activity • Started in 2010 A worldwide network of GNSS stations • Global satellite coverage • Real-time NTRIP streams to IGN, CNES, IGS casters • State of the art multi constellations/signals capability GPS, Galileo, GLONASS, Beidou, SBAS, QZSS, NAVIC… An international collaboration, with Site Agreements with many agencies and institutes around the world 5 CNES / IGN REGINA NETWORK https://regina.cnes.fr/ 38 sites February 2021 Standard E6 Capability 6 2020 Quarter 3 & 12 Months CNES MAIN RESULTS • For 22 operational satellites, means over FNAV/INAV ephemerides • SISE GA at 95% 2020Q3 Dual-Frequency ~18 cm & SF 26 cm • Same order 18/30, 18/30, 17/28 cm on 2019Q3, 2020Q1, 2020Q2 • Mean Satellite availability 2020Q3 ~98.5% over last 12 months • 96.3, 96.3, 96.6 % on 2019Q3, 2020Q1, 2020Q2 • Losses mainly due to July 2019 incident for up to 2020Q2, SISA=NAPA events, and some satellite events/operations • Monthly PDOP<6 2020Q3 mean availabilities over all user locations >99.9% with same order for yearly • For best receivers and environments when PDOP<6, 2020Q3 • Horizontal positioning accuracy <1.2 m at 95% for DF and SF • Vertical positioning accuracy <2.7 m at 95% for DF and SF • Same order for yearly 7 SISE 95% STATISTICS 2020 Q3 Dual & Single Frequency Minimum Performance Level (MPL): 2 m at 95% 8 Global Average SISE 2020 Q3 Dual-Frequency per satellite MPL: 7 m at 95% for worst satellite 22 operational satellites 9 SISE JULY 2020 FOR DF E1/E5a FNAV VS TIME 10 SATELLITE AVAILABILITIES JULY 2020 FOR DF E1/E5a FNAV MPL: 87% per slot 11 PDOP<6 AVAILABILITY JULY 2020 FOR DF E1/E5a FNAV MPL: 77% at average location 12 WP 3.1 Receiver Brussels (BRUX) horizontal accuracies for 2020 Q3 13 GALILEO SYSTEM IMPORTANT EVENTS FROM 2018 Q4 • Half a day unavailabilities of satellites as a mean on 7-8 November 2018 • Galileo service unavailable for 6 days 11-17 July 2019 • E11 SISE up to ~484 m FNAV on 29 October 2019 with ~40 minutes impact over South Indian Ocean • …more recently on 14 December 2020 Galileo service unavailable for a few hours • More « routine » since end of 2019 with limited SISE spikes but still a few events e.g. some 2 day SISA=NAPA periods 14 SUMMARY • Initial Services Requirements are met • Excellent SISE at 95% for Galileo <20 cm DF • Mean availability of satellites over 99% • PDOP<6 availability over 99% • Typical 1 m horizontal accuracy at 95% for good environment and receiver • Galileo deployment still in progress • CNES and partners results are in line, complementary and constructive work between GRC-MS partners and beyond 15.