By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This ebook offers with air-ground aeronautical communications. the most objective is to offer the reader a survey of the at present deployed, rising and destiny communications platforms devoted to electronic info communications among the airplane and the floor, specifically the knowledge hyperlink. these communique structures convey particular houses rather to these regularly occurring for terrestrial communications. during this publication, 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 advent to aeronautical communications, their particular recommendations, homes, necessities and terminology. the second one half offers the at present used structures for air flooring communications in continental and oceanic zone. The 3rd half enlightens the reader at the rising and destiny communique platforms and a few major learn tasks eager about this scope. ultimately, prior to the belief, the fourth half offers numerous major demanding situations and learn instructions at the moment lower than investigation.
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Extra resources for Aeronautical Air-Ground Data Link Communications
16. T slot format SUs do not have a generic format. On the contrary, the standard describes all the SUs needed for signaling and data exchanges. This per-field format description allows optimizing the SUs size at the detriment of flexibility. 17 presents a typical SU format, in this case a connection request from GES to AES on a P channel. GES Identifier is coded over 1 byte, AES Identifier over 3 bytes. A noticeable field is Q number used for priority management. Q = 15 denotes an emergency message, zero corresponds to the lower priority.
The VHF civil aviation band extends from 108 to 136 MHz. Communication channels are defined over the 118– 136 MHz range with 720 channels. New services will share the Distance Measuring Equipment (DME) L-band allocation. SATCOMs usually use frequencies L-band for the mobile service, with a planned move to Ka-band in the near future. 2. Frequency sharing and multiple access Services are built on the basis of the frequency allocation. The main design step is to define the way this resource will be shared by the terminals.
Concerning ATSC, additional features are implemented on top of the above described protocol, which requires additional information to be added in each block. In particular, an additional ground address field is added as an extension field at the beginning of the user data field. For bit-oriented applications, such as CPDLC and ADS-C, a bit-tocharacter conversion is applied. It has to be noted that this conversion divides the throughput by a factor of 2: binary data are simply written in the character representation of the hexadecimal value of each byte.