Download - ACARS
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STUDY ON AIR TO GROUND DATALINK COMMUNICATION
ACARS
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HISTORY
• Airborne Communication
• VHF Voice communications
• AM
• Telex formats
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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
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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
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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
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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
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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
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PROBLEM
• Growing number of ACARS aircraft
• Potential new demand from new participants
• Civil: Large Scheduled (Regional), Cargo, and Business
• Military: Non-Tactical Aircraft, Air National Guard
• Estimated potential at larger scale
• Increasing number of data link applications
• Aircraft Performance
• Crew Management
• In-flight Operations
• Many areas are already experiencing congestion on en route frequencies
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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.
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Presented By:V SHYAM PRASADA [email protected]