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PHARE Aeronautical Telecommunication Network: PATN

C ENTRE D'ETUDES DE LA NAVIGATION AERIENNE. PHARE Aeronautical Telecommunication Network: PATN. By Gérard Mittaux-Biron PATN Project Leader CENA. What is PATN ?. PATN is an implementation of the ATN that supported data-link communications for the 3rd PHARE Demonstration

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PHARE Aeronautical Telecommunication Network: PATN

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  1. CENTRE D'ETUDES DE LA NAVIGATIONAERIENNE PHARE Aeronautical Telecommunication Network:PATN By Gérard Mittaux-Biron PATN Project Leader CENA

  2. What is PATN ? • PATN is an implementation of the ATN that supported data-link communications for the 3rd PHARE Demonstration • PATN is a collaborative work, carried out by: • CENA in France, • DERA/NATS in the United Kingdom, • DLR in Germany, • EEC for Eurocontrol, • NLR in the Netherlands.

  3. PATN Infrastructure: Inter-connection of ATN routers SITA X.25 Network Transpac X.25 Network

  4. PATN Infrastructure: Inter-connection of ATN routers SITA X.25 Network Transpac X.25 Network

  5. PATN Infrastructure: The end-systems SITA X.25 Network Transpac X.25 Network

  6. Data-Link Services supported by PATN • Downlinking of Aircraft Parameters (DAP) • Frequency Change (FC) • Position Reporting (PR) • Trajectory Negotiation (TN)

  7. Main Phases of the PATN Project • PATN in stand-by during the external development of the ATN Router by the EURATN project • Development of ATN Upper-Layers • Development of PATN Application Service Elements • Deployment of the PATN infrastructure: • Routers • PATN end systems • Integration in the air and ground platforms of the partners

  8. Technical Choices for PATN • Compliance with International Civil Aviation Organisation (ICAO) standards for the Aeronautical Telecommunication Network whenever applicable • Aeronautical Mobile Satellite Services (AMSS) retained as the mobile subnetwork for air-ground communications

  9. PATN Approach to Developments • Use of the EURATN router • Use of commercial off-the-shelf industrial products • ATN Upper-Layers • ICAO Standard ATN application: • Controller-Pilot Data-Link Communications • PHARE-Specific applications: • Downlinking of Aircraft Parameters ; Position Reporting ; Trajectory Negotiation • Access to the mobile subnetwork: • Interface between AMSS avionics and PATN workstations

  10. PATN Spin-Offs • ATN Validation • AATMS project with the involvment of DERA and NLR • CHARME project for CENA

  11. ATN Validation • First prototype implementation of ATN upper-layers communication services • Agreement between PHARE and an industrial partner: • The PATN upper-layers were re-engineered as an industrial product • PATN partners are entitled free source and binary licences • Free maintenance on the ATN upper-layers product • First deployment of a full-stack ATN infrastructure with air and ground components • Kernel of an ATN infrastructure for the PATN partners

  12. AATMS Project • Validation of advanced Flight Management Systems • Implementation of a data-link infrastructure: • Adapted ATN based on PATN • Connection of: • DERA BAC 1-11 experimental aircraft • NLR Cessna Citation experimental aircraft • AATMS ground infrastructure • Transparently « switchable » access to: • Aeronautical Mobile Satellite Services (AMSS) • VHF Digital Link (VDL) mode 2

  13. CHARME Project • Experimental ATN platform of the French DGAC • Support of data-link experimentations, such as: • EOLIA (European pre-operational data-link application) • COCLICO (internal CENA project on the co-operation of collaborative tools and data-link for the control) • Contribution to the validation of the ICAO standards for the ATN: • Future data-link applications • ATN Security & System Management • Connectionless ATN services

  14. Existing PATN Enhancements • For AATMS: • access to VDL mode 2 • Automatic Dependent Surveillance (ADS) application • For CHARME: • Automatic Dependent Surveillance (ADS) application and ADS Report Forwarding • Flight Information Services (FIS) application • Context Management application

  15. Experimental Results • Requirements per aircraft for the PD/3 scenario: • 100 bytes every 10 seconds for Position Reporting • up to 3000 bytes for a Trajectory Negotiation • around 100 bytes per clearance Good behaviour of loopback configurations of upper-layers used for the simulated air-traffic • Good behaviour of loopback configurations of ATN upper-layers used for the simulated air-traffic • Problems with the reliability of the AMSS for data-link communications with the actual aircraft • Better performances were stated by AATMS with VDL mode 2

  16. Conclusion • PATN provided the realistic data-link infrastructure required for PD/3 • PATN contributed to the validation of the ATN protocol suite • The quality of service provided by the mobile subnetwork is critical for the perceived quality of ATN services: AMSS did not perform as expected at the time of PD/3 • The PATN components and infrastructure can be successfully built-upon by the partners

  17. CENTRE D'ETUDES DE LA NAVIGATIONAERIENNE PHARE Aeronautical Telecommunication Network:PATN By Gérard Mittaux-Biron PATN Project Leader CENA next

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