Aeronautics Astronautics

Aeronautical Air-Ground Data Link Communications by Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas

By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik

This publication bargains with air-ground aeronautical communications. the most aim is to offer the reader a survey of the presently deployed, rising and destiny communications platforms devoted to electronic facts communications among the plane and the floor, particularly the knowledge hyperlink. these verbal exchange structures exhibit particular homes rather to these accepted for terrestrial communications. during this booklet, the method architectures are extra in particular thought of from the entry to the appliance layers as radio and actual functionalities have already been addressed intimately in others books.

The first half is an advent to aeronautical communications, their particular techniques, houses, standards and terminology. the second one half provides the at present used platforms for air floor communications in continental and oceanic quarter. The 3rd half enlightens the reader at the rising and destiny verbal exchange platforms and a few prime study initiatives excited about this scope. eventually, earlier than the realization, the fourth half offers numerous major demanding situations and study instructions at present less than investigation.

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More specifically, several technical choices or protocol stacks were proposed in the VHF band and are called VDL (VHF data link) mode 2 to 4. ). 2. VDL2 and ACARS over AVLC The first projects of implementation of ATN air–ground data link applications for air traffic services (both in Europe and the United States) considered continental dense airspaces. As stated before, performances of the air–ground subnetwork will comply with the operational environment, and the VDL mode 2 was selected as air–ground subnetwork for its high bandwidth, low delays capability and lower costs.

As a result, a transitory solution had to be found to allow ATSC applications using ATN to be hosted onboard aircraft with AOC and AAC applications using the ACARS network. Airline communications could have been carried on ATN as mentioned before, but this solution had not been selected. Indeed, compared to ACARS, ATN does not specifically address airline needs or services. Considering the costs that are required when equipping a fleet of aircraft and the ground end systems, there is real-added value, from an airline perspective, to switch to ATN only for AOC and AAC purposes.

Simulations showed that some performance improvements may be achieved by fine tuning the value of the probability and in particular by using a higher value for ground stations than for aircraft. Finally, the simulation tool was also used to evaluate the number of additional VDL 2 channels to be operated so as to cope with increasing Link 2000+ equipage ratios to support ATN CPDLC application in Europe. Results gave reasonable confidence in the need for two or three additional channels for the core area in Europe to keep peak traffic day round trip delay below 8 s.

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