By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This ebook bargains with air-ground aeronautical communications. the most objective is to provide the reader a survey of the at the moment deployed, rising and destiny communications platforms devoted to electronic information communications among the plane and the floor, specifically the information hyperlink. these conversation platforms exhibit particular houses fairly to these everyday for terrestrial communications. during this e-book, the approach 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 creation to aeronautical communications, their particular ideas, houses, necessities and terminology. the second one half provides the presently used platforms for air flooring communications in continental and oceanic sector. The 3rd half enlightens the reader at the rising and destiny conversation structures and a few major learn initiatives fascinated with this scope. ultimately, ahead of the realization, the fourth half supplies a number of major demanding situations and study instructions at present below investigation.
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Extra resources for Aeronautical Air-Ground Data Link Communications
Beyond line of sight communications using HF The main characteristic of HF transmissions is the ability to establish links beyond line of sight. Two physical phenomena are used for this purpose. 6 MHz; this phenomenon is not used by the HFDL data link that operates at higher frequencies. The second phenomenon is based on the properties of the ionosphere layer of the atmosphere between 60 and 800 km where a partial ionization of gases is observed. Refraction of electromagnetic waves in the HF range within the ionosphere allows propagation over long distances.
For this kind of situation, a VDL mode 2 ground system may request the avionics system to initiate a handoff, and optionally to tune to another frequency at the same time. On reception of a handover request, the avionics system will perform the handoff, just like described here above. Obviously, in the case the radio has been retuned, it is not possible to properly implement a make-beforebreak handoff with only one radio: communication on the previous frequency becomes unavailable as soon as the radio has been retuned to the new one.
G. signal strength) compared to others, maximum retransmission count exceeded on the current data link connection, congested frequency channel or silent ground station. In any of these cases, a new ground station will be chosen, with the same provided services as far as possible. If the selected ground station does not belong to the same ground system, the airborne system will have to use the link establishment procedure presented here above, as it has also to log on the new ground system, and the old link will be explicitly disconnected by sending a DISC frame.