ACARS

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This is a presentation on air to ground data link communication.

This is a presentation on air to ground data link communication.

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  • 1. STUDY ON AIR TO GROUND DATALINK COMMUNICATION ACARS
  • 2. HISTORY • Airborne Communication • VHF Voice communications • AM • Telex formats
  • 3. INTRODUCTION • ACARS: Aircraft Communications Addressing and Reporting System • Full-duplex datalink • Effort to improve data integrity and reduce crew workload • Introduced in 1978 • 2400 baud rate
  • 4. WORKING • An on board person or system can create a message and send it via ACARS to a system or user on the ground, and vice versa. • Remote Ground Stations • VHF Subnetwork: Line-of-sight propagation • HF Subnetwork: Continental Coverage • Satellite Communication: World-wide coverage
  • 5. USES • OOOI Events: Out of the gate, Off the ground, On the ground, and Into the gate • ADS : Automatic Dependent Surveillance – Position reporting of a/c • Flight management system interface: Flight plans and weather conditions etc., • Maintenance data download: Operational performance • Interactive crew interface: Crew communication • Online black-box
  • 6. EXAMPLE MESSAGE A typical ACARS VHF transmission. Mode A Aircraft B-18722 Ack NAK Block id 2 Flight CI5118 Label B9 Msg No. L05A Message /KLAX.TI2/024KLAXA91A1
  • 7. WHAT ARE WE USING TODAY? • Aircraft Communication Addressing and Reporting System (ACARS) • Character based transmissions • 2400 bps transmission speeds • In use since 1978 • Current statistics (ARINC) • Service provided through 196 stations • System is reaching it’s capacity in U.S./Europe Page 8
  • 8. PROBLEM • Growing number of ACARS aircraft • Potential new demand from new participants • • Military: Non-Tactical Aircraft, Air National Guard • • Civil: Large Scheduled (Regional), Cargo, and Business Estimated potential at larger scale Increasing number of data link applications • • Crew Management • • Aircraft Performance In-flight Operations Many areas are already experiencing congestion on en route frequencies Page 9
  • 9. SOLUTION • Managing spectrum congestion and availability will be a growing and continuing concern for the airline industry. • Over the next 20 years, ACARS will be superseded by the Aeronautical Telecommunications Network (ATN) protocol for Air Traffic Control communications and by the Internet Protocol for airline communications.
  • 10. Presented By: V SHYAM PRASADA RAO shyamforever@live.com