GALILEO NAVIGATION MONITORING CNES - Bernard Bonhoure & Co CNES - European ...

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

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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

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
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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

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CNES / IGN REGINA NETWORK

https://regina.cnes.fr/

     38 sites

February 2021

                          Standard E6 Capability

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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 PDOP99.9% with same order for yearly
  • For best receivers and environments when PDOP

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
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SISE JULY 2020 FOR DF E1/E5a FNAV VS TIME

                                            10

SATELLITE AVAILABILITIES JULY 2020 FOR DF E1/E5a FNAV

MPL:
87% per
slot

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PDOP

WP 3.1 Receiver Brussels (BRUX) horizontal accuracies for
2020 Q3

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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
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SUMMARY

  • Initial Services Requirements are met
  • Excellent SISE at 95% for Galileo