By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This e-book offers with air-ground aeronautical communications. the most aim is to provide the reader a survey of the at the moment deployed, rising and destiny communications structures devoted to electronic info communications among the airplane and the floor, specifically the knowledge hyperlink. these verbal exchange structures exhibit particular houses rather to these customary for terrestrial communications. during this booklet, the approach architectures are extra in particular thought of from the entry to the applying 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 innovations, houses, specifications and terminology. the second one half provides the at present used structures for air flooring communications in continental and oceanic sector. The 3rd half enlightens the reader at the rising and destiny communique platforms and a few top learn tasks involved in this scope. eventually, sooner than the realization, the fourth half supplies a number of major demanding situations and learn instructions at present less than investigation.
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Extra resources for Aeronautical Air-Ground Data Link Communications
13 shows the format for frames on P channel. 13. e. a preset bit sequence, is introduced in order to delineate the frames. Then, frame format identifier and frame counters are 40 Aeronautical Air–Ground Data Link Communications defined. SUs are sent in sequence, the number of SUs per frame is set so that the frame duration equals 500 ms (rates higher than 1,200 bit/s). 5 kbit/s frame can accommodate 26 SUs. Scrambling randomizes 0 and 1 distribution using a pseudo-random sequence. Channel coding is a simple yet robust ½ convolutional coding.
Inmarsat “Classic Aero” services The physical channels are defined by the direction and access technique: – P channel. P stands for Packet. The P channel is dedicated to the communications from Earth stations (GES) to the aircraft (AES). GES transmits a continuous carrier and multiplexes data (Time Division Multiplex (TDM)). The P channel carries both signaling and data packets. Aircraft recover data by address filtering. The main benefits of the TDM access are its simplicity and capability to multiplex unicast (from GES to one single aircraft), multicast (from GES to a group of aircraft) and broadcast traffic (from GES to all aircraft).
2. Implementation of data link using HF channels, motivation, access method and expected performances The HFDL data link, unlike voice connections, uses phase modulation of BPSK, QPSK and 8PSK types. These modulations have a symmetrical spectrum around the center frequency, which is not the case of SSB modulation. 21 shows the definition channels for HFDL. 4 kHz from the center frequency of the phase modulated carrier. The channel spans over 3 kHz. 21. HFDL channel definition The symbol rate is set to 1,800 symbols per second.