PHARE Aeronautical Telecommunication Network: PATN

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PHARE Aeronautical Telecommunication NetworkPATN

• By Gérard Mittaux-Biron
• PATN Project Leader
• CENA

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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.

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PATN Infrastructure Inter-connection of ATN
routers
SITA X.25 Network
Transpac X.25 Network
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PATN Infrastructure Inter-connection of ATN
routers
SITA X.25 Network
Transpac X.25 Network
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PATN Infrastructure
The end-systems
SITA X.25 Network
Transpac X.25 Network
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Data-Link Services supported by PATN

• Downlinking of Aircraft Parameters (DAP)
• Frequency Change (FC)
• Position Reporting (PR)
• Trajectory Negotiation (TN)

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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

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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

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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

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PATN Spin-Offs

• ATN Validation
• AATMS project with the involvment of DERA and NLR
• CHARME project for CENA

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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

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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

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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

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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

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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

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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

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PHARE Aeronautical Telecommunication NetworkPATN

• By Gérard Mittaux-Biron
• PATN Project Leader
• CENA
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