By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This e-book offers with air-ground aeronautical communications. the most objective is to provide the reader a survey of the presently deployed, rising and destiny communications structures devoted to electronic info communications among the plane and the floor, particularly the knowledge hyperlink. these communique platforms convey particular homes quite to these favourite for terrestrial communications. during this booklet, the procedure 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 advent to aeronautical communications, their particular strategies, houses, necessities and terminology. the second one half provides 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 conversation platforms and a few major study initiatives eager about this scope. ultimately, earlier than the realization, the fourth half offers numerous major demanding situations and study instructions at present less than investigation.
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Extra info for Aeronautical Air-Ground Data Link Communications
The size of the transmit window is limited to one: an ACARS router will wait for the acknowledgement of the previous block before sending the next. Each block contains an identifier of the type of message called label that more or less identifies the sending application. g. link test and media advisory). The address contained in the ACARS block always identifies the aircraft. Some variants introduce a way to address ground stations but usually, blocks are sent in broadcast mode. e. it is not provided by the transmitting station).
6. 7 shows the performance of ALOHA and S-ALOHA using two parameters: the total load G and the efficiency S. G is calculated by summing the transmission time of all data packets and dividing by the observation time. For example, in case of S-ALOHA, G = 1 means that on average, a packet is transmitted in each time slot. Some slots have several packets that collide, other slots are empty. e. without collision, and dividing by the observation time. 1 means that 10% of the time slots are used to transmit a useful data packet.
1. ACARS The ACARS air–ground VHF subnetwork provides a data rate of 2,400 bps (to be shared among the aircraft) and uses a CSMA media access control algorithm. The channels used for this subnetwork are allocated per region and per service provider in the ATC voice band (118–137 MHz). Each service provider has an exclusive allocation of one or more channels. 26 Aeronautical Air–Ground Data Link Communications Transmissions are organized in fixed formatted blocks of 258 bytes. Each block may contain up to 220 bytes of user data among which the first bytes may be reserved for some header extension fields (message number and flight identifier).