CENTRE D'ETUDES
DE LA NAVIGATION
AERIENNE
PHARE Aeronautical
Telecommunication Network:
PATN
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: Interconnection of ATN routers
SITA X.25
Network
Transpac
X.25
Network
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PATN Infrastructure: Interconnection of ATN routers
DERA/NATS
NLR
DERA/NATS
NLR
SITA X.25
Network
EEC
CENA ATH
Transpac
X.25
Network
EEC
CENA TLS
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PATN Infrastructure:
The end-systems
DERA/NATS
NLR
DERA/NATS
NLR
SITA X.25
Network
EEC
CENA ATH
Transpac
X.25
Network
EEC
CENA TLS
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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 airground communications

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PATN Approach to
Developments


Use of the EURATN router
Use of commercial off-the-shelf industrial products


ICAO Standard ATN application:


Controller-Pilot Data-Link Communications
PHARE-Specific applications:


ATN Upper-Layers
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 upperlayers 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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CENTRE D'ETUDES
DE LA NAVIGATION
AERIENNE
PHARE Aeronautical
Telecommunication Network:
PATN
By Gérard Mittaux-Biron
PATN Project Leader
CENA
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