1. 1 C ENTRE D'ETUDES DE LA NAVIGATION AERIENNE PHARE Aeronautical Telecommunication Network: PATN By Gérard Mittaux-Biron PATN Project Leader CENA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

16. 16 Conclusion l PATN provided the realistic data-link infrastructure required for PD/3 l PATN contributed to the validation of the ATN protocol suite l 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 l The PATN components and infrastructure can be successfully built-upon by the partners

17. 17 C ENTRE D'ETUDES DE LA NAVIGATION AERIENNE PHARE Aeronautical Telecommunication Network: PATN By Gérard Mittaux-Biron PATN Project Leader CENA next