By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This booklet offers with air-ground aeronautical communications. the most aim is to offer the reader a survey of the at the moment deployed, rising and destiny communications platforms devoted to electronic facts communications among the plane and the floor, specifically the knowledge hyperlink. these communique platforms exhibit particular houses really to these typical for terrestrial communications. during this ebook, the process architectures are extra particularly 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 suggestions, houses, standards and terminology. the second one half provides the at the moment used platforms for air flooring communications in continental and oceanic region. The 3rd half enlightens the reader at the rising and destiny communique platforms and a few prime study tasks all for this scope. ultimately, ahead of the belief, the fourth half supplies a number of major demanding situations and study instructions at present less than investigation.
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These frames convey all the parameters to be used or negotiated, along with necessary ATN router connectivity information and frequency management. AVLC defaults to transmit up to 1,024 bytes long frames with a transmit window size of four frames. Retransmission timer values adapt to the channel utilization and the number of preceding retransmissions. Acknowledgements are sent with a small delay to increase the probability of having the acknowledgement piggybacked with upper layers data. Finally, AVLC uses selective reject to request the retransmission of lost frames (as opposed to the go-back-n way of working) with the ability to acknowledge multiple well-received frames.
The satellite is thus seen as a fixed point in the sky, and permanent communications can be provided. Three geostationary satellites provide complete Earth coverage, with the noticeable exception of the poles. The advantages of a geostationary orbit from a geometry perspective are, however, accompanied by constraints in the design of the communication system. The long distance to be traveled by the radio signal rises a significant propagation time of about 125 ms between satellite and ground. The corresponding delay is 250 ms and is particularly noticeable during a telephone conversation.
However, when considering onboard avionics certification and retrofit costs, IP-based ATN system will probably not replace the currently deployed OSI ATN systems immediately, taking into account aircraft’s lifecycle: airlines may be reluctant to retrofit aircraft already equipped with OSI ATN systems, and both ATN/OSI and ATN/IPS will coexist. 4. ATN applications As stated previously, the applications defined within the ATN documents are very similar to those defined in FANS 1/A. However, they are not interoperable: one FANS 1/A aircraft cannot inter-operate with a ground ATN baseline 1 system and vice versa.