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Egnos based solution for the french dgps network

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The status of implementation.

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Egnos based solution for the french dgps network

  1. 1. The status of implementation EGNOS based solution for the French DGPS network
  2. 2. What is DGPS in maritime ?  Usually called IALA beacon stations  Shore-based service (283,5 to 325 KHz)  International interoperability  Improve accuracy  Ensure Integrity  Contribute to IALA1 WWRNP CONTEXT 1 International association of marine Aids to navigations and Lighthouse Autorithies
  3. 3. Legacy French network  7 stations  Central monitoring  Old low rate WAN  No changes since 90’s  No redundancy at station  Availability decreasing CONTEXT
  4. 4.  Discussed within IALA PNT WG  Accuracy measurements:  DGPS French IALA Beacon  GPS standalone  GPS corrected by EGNOS SiS  GPS corrected by EGNOS based RTCM converted from EGNOS RTCA EDAS stream (VRS for Pont de Buis) Note: 33 Km distance from the station to the rover PRELIMINARY STUDIES IS EGNOS A GOOD CANDIDATE FOR MARITIME DGPS MODERNISATION ?
  5. 5. FULL SCALE DEMONSTRATOR Architecture description  Several possible architectures to use EGNOS  Both EGNOS SiS ans EDAS  Centralised/Decentralised  IALA Guideline G1129 (The Retransmission of SBAS Corrections Using MF-Radio Beacon and AIS)  Centralised architecture selected  Implemented on a real French IALA Beacon station (Olonne, ID464)
  6. 6. FULL SCALE DEMONSTRATOR Central Server Software  Beacon.net (Alberding GmbH)  Host in French government central IT facilities  Implement the VRS concept  Configure the RTCM streams generation for any location of the EGNOS coverage  Perform integrity checked
  7. 7. DGPS Station: MSK Modulator  Developped by ACTRIS company to fit specific maritime DGPS requirements.  Comply with ITU M823-3  Ability to deal with two sources of RTCM  Broadcast autonomously a RTCM message 6 in case of corrections unavailability  Possibility to recover RTCM streams remotely for logging (i.e injuries situation)  IP enabled, Web monitoring & remote set-up FULL SCALE DEMONSTRATOR
  8. 8. Results Availability : >99,8% IMO A1046 requirement)  February, 15th to March, 15th 2018 – Central server side (beacon.net) - 99,86%  July 2018 – User side (DGPS French Control Center Belle-île en mer) - 100%
  9. 9. Results Local GPS/DGPS Antenna Position Accuracy 0,01m MF Signal GPS Accuracy  The local GPS/DGPS Antenna set nearby the MF station  The GPS/DGPS receiver compute both GPS standalone and EGNOS over DGPS corrected positions  Accuracy around 1m at Belle-île control center (150 Km from the station) FFM_SABL: EGNOS over DGPS RAW_SABL: GPS standalone
  10. 10. Results Integrity  Pre-broadcast integrity monitoring (PBM) thresholds (on Beacon.net) compliant with IALA Guideline 1112 – Performance and Monitoring of DGNSS Services in the Frequency Band 283.5- 325kHz  No integrity warnings occurred during the period  Pre-broadcast monitoring sensitivity was successfully tested by decreasing thresholds in order to generate warnings
  11. 11. Cost-Based Analysis  Costs assessment (per DGPS station)  To be also considered :  Less equipment maintenance costs (centralised architecture)  High reliable network subscription needed (new charge for the service provider) Cerema CBA GSA Traditionnal DGPS (no redundancy) 150 K€ 133 K€ EDAS-Centralized 20 K€ 27 K€
  12. 12. Conclusion Towards an operational service  Compliance of the EDAS centralised solution  Reduction of the overall costs for the provider  Official Commissioning of the first French station will come early 2019  More stations equipped during 2019  Possible local backup solution under reflexion (EGNOS SiS based with a local receiver)
  13. 13. Thank you ! Etienne LEROY Etienne.leroy@cerema.fr +33 2 98 05 67 50

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