By Dale Stacey

ISBN-10: 0470018593

ISBN-13: 9780470018590

ISBN-10: 0470035102

ISBN-13: 9780470035108

Content material:
Chapter 1 creation (pages 1–8):
Chapter 2 conception Governing Aeronautical Radio structures (pages 9–104):
Chapter three VHF conversation (pages 105–144):
Chapter four army conversation platforms (pages 145–156):
Chapter five Long?Distance cellular Communications (pages 157–175):
Chapter 6 Aeronautical Telemetry structures (pages 177–186):
Chapter 7 Terrestrial Backhaul and the Aeronautical Telecommunications community (pages 187–199):
Chapter eight destiny Aeronautical cellular conversation structures (pages 201–219):
Chapter nine The Economics of Radio (pages 221–227):
Chapter 10 floor Installations and gear (pages 229–257):
Chapter eleven Avionics (pages 259–305):
Chapter 12 Interference, Electromagnetic Compatibility, Spectrum administration and Frequency administration (pages 307–324):

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Additional resources for Aeronautical Radio Communication Systems and Networks

Example text

It provides a theoretical method to calculate which frequencies are most suitable at which times. It identifies a couple of concepts. Maximum Usable Frequency. This is a median value statistically. The chances at the time of validity of an HF channel frequency being ‘open’ above this value are 50 %. Highest Possible Frequency. This is the HF, above which statistically there is only a 10 % chance of the frequency being open. Optimum Working Frequency. channel being open. This is the highest HF that gives a 85 % likelihood of the Critical Frequency (FOE).

27 The modulation conundrum. 27) There is a relationship between all of these aspects (mathematically it is Shannon’s law; see later), and it is usually necessary to trade off one requirement against the others to achieve the best overall engineering solution. In reality, for low-specification systems where performance is not so critical, rugged and rudimentary low-order modulation schemes can work very efficiently, and this keeps cost and complexity down. For some of the more sophisticated systems where data throughput in a limited bandwidth is premium, some of the more sophisticated and elaborate modulation schemes pushing the limits of Shannon’s law become applicable if not essential.

Analogue Digital DSB-AM SSB-AM SC-AM FM PSK FSK DPSK DFSK QAM TCM With voice over legacy radio systems, it is never even coming into the digital domain. It is analogue when it starts, it goes through an analogue to analogue conversion as it is modulated and then at the end it is an analogue to analogue demodulation process. 3 Amplitude Modulation (AM) AM is when the amplitude of the carrier is directly proportional to the modulating signal. Probably the simplest form of AM is double side band amplitude modulation (DSB-AM).

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Aeronautical Radio Communication Systems and Networks by Dale Stacey

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