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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

CENTRE D'ETUDES

DE LA NAVIGATIONAERIENNE

PHARE Aeronautical Telecommunication Network:PATN

By Gérard Mittaux-Biron

PATN Project Leader

CENA

what is patn
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.
patn infrastructure inter connection of atn routers
PATN Infrastructure: Inter-connection of ATN routers

SITA X.25 Network

Transpac X.25 Network

patn infrastructure inter connection of atn routers4
PATN Infrastructure: Inter-connection of ATN routers

SITA X.25 Network

Transpac X.25 Network

patn infrastructure
PATN Infrastructure:

The end-systems

SITA X.25 Network

Transpac X.25 Network

data link services supported by patn
Data-Link Services supported by PATN
  • Downlinking of Aircraft Parameters (DAP)
  • Frequency Change (FC)
  • Position Reporting (PR)
  • Trajectory Negotiation (TN)
main phases of the patn project
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
technical choices for patn
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
patn approach to developments
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
patn spin offs
PATN Spin-Offs
  • ATN Validation
  • AATMS project with the involvment of DERA and NLR
  • CHARME project for CENA
atn validation
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
aatms project
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
charme project
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
existing patn enhancements
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
experimental results
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
conclusion
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
phare aeronautical telecommunication network patn17

CENTRE D'ETUDES

DE LA NAVIGATIONAERIENNE

PHARE Aeronautical Telecommunication Network:PATN

By Gérard Mittaux-Biron

PATN Project Leader

CENA

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