By Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik
This booklet offers with air-ground aeronautical communications. the most target is to provide the reader a survey of the presently deployed, rising and destiny communications structures devoted to electronic facts communications among the plane and the floor, specifically the knowledge hyperlink. these communique platforms convey particular homes particularly 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 creation to aeronautical communications, their particular techniques, houses, 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 top examine initiatives interested in this scope. eventually, ahead of the belief, the fourth half supplies a number of major demanding situations and study instructions at present lower than investigation.
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Additional resources for Aeronautical Air-Ground Data Link Communications
1. 3. 1. 1. Frequency bands for aeronautics As any wireless communication network, ATN is subjected to the International Telecommunications Union (ITU, a specialized agency of the UNs) regulations for frequency allocation. 2. 2. Frequency bands The allocation of frequencies was conducted over time to allow the coexistence of all services. The stakes are nonetheless very important; the available bandwidth is often the main limitation to the capacity of radio communication systems. Several HF sub-bands are allocated to civil aviation in between 2,850 and 24,890 kHz.
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. In particular, for safety reasons, CPDLC adds a digital signature to the message, which is called the protected mode, hence it is called PM-CPDLC. Also, CPDLC message sets are not identical, and the ATN applications also provide an applicative acknowledgment of received messages known as Logical ACK (LACK) that does not exist in FNAS 1/A.
Each signal is composed of the encoded data stream “multiplied” by a spreading code specific to each terminal. The spreading code then acts as an encryption key. Only the receiver having knowledge of the spreading code can reconstruct the signal. Other signals act as an additional noise, and in this case additive. 3 is an opportunity to introduce a CDMA system. 3. Random access basics As indicated in the preceding section, the access techniques fall into two main categories: deterministic or random access.
Aeronautical Air-Ground Data Link Communications by Mohamed Slim Ben Mahmoud, Christophe Guerber, Nicolas Larrieu, Alain Pirovano, Jos? Radzik