By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This ebook 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 structures devoted to electronic info communications among the plane and the floor, particularly the knowledge hyperlink. these verbal exchange structures express particular houses particularly to these widespread for terrestrial communications. during this publication, the process 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 strategies, homes, specifications and terminology. the second one half provides the presently used structures for air floor communications in continental and oceanic region. The 3rd half enlightens the reader at the rising and destiny conversation platforms and a few prime examine tasks occupied with this scope. eventually, sooner than the realization, the fourth half supplies numerous major demanding situations and study instructions at the moment less than investigation.
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Extra resources for Aeronautical Air-Ground Data Link Communications
4 kbps, direct Internet data with a throughput rate of up to 10 kbps and short burst data (SBD) service. A new satellite constellation, Iridium Next, will take over existing satellites with greatly increased capacities. Throughputs greater than 1 Mbit/s are advertised for L-band terminals, 8 Mbit/s for Ka-band terminals. Service entry is planned in 2017. 4. HF communications The HF band corresponds to wavelengths between 10 and 100 m and has a frequency range of 3–30 MHz. HF communications are a traditional way Current Communication Radio Systems for Data Link 45 for voice that may also use channels in the Medium Frequency (MF) band (300 kHz–3 MHz).
Finally, VDL mode 2 will allow sharing the same frequency for several DSPs, which suppose that all the ground stations operating on a Current Communication Radio Systems for Data Link 29 given frequency will not be considered equally. Moreover, for scalability reasons, it is reasonable to be able to define groups of ground stations in large continental areas instead of having a suboptimal single global VDL 2 subnetwork. This concept is known as a VDL mode 2 ground system, where procedures between ground stations belonging to the same ground system are not applicable if they do not.
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. There are several different variants for handing over a connection from one ground station to another within the same VDL mode 2 system. We will only describe the two that are currently implemented: air-initiated handoff and ground requested air-initiated handoff.