Aeronautical Radio Communication Systems and Networks
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Typically, there are over twenty radio systems on board the average commercial jet aircraft dealing with communication, navigation and surveillance functions. Very high frequency (VHF) air-to-ground communication is usually the main method of information and control exchange between pilot and air traffic control. Satellite and high frequency radio links are used to complement this system for long range or oceanic information exchanges. Other communications systems are required between the airline operation centre and the pilot and sometimes between the passengers and the ground.
A comprehensive guide to current systems, networks and topologies, this book covers application requirements for communication and related radio-navigation and surveillance functions in aeronautical systems. There is also an insight into future possibilities as technologies progress and airspace operation and control scenarios change.
Ideal for civil aviation authorities, airspace management providers and regulatory organizations, Aeronautical Radio Communication Systems and Networks will also appeal to aircraft and radio equipment manufacturers and university students studying aeronautical or electronic engineering.
Provides a broad and concise look at the various communications systems on board a typical aircraft from a theoretical, system level and practical standpoint with worked examples and case studies throughout.
Considers all types of aircraft from light aircraft to large commercial jets and specialised supersonic aircraft.
Looks at existing airport radio communication infrastructure and proposals for new very high bandwidth radio applications within the airport environment.
Provides a complete list of formulae for engineering design analysis and quick checks on system performance or interference analysis.
reality a more practical figure is about 70 %. It is twice as bandwidth efficient as the DSB-AM system. Disadvantages of SSB-AM: r r More sophisticated demodulation is required (coherent detector with PLL, costas loop). It can be prone to phase distortions (due to Tx and Rx oscillators beating and changing), so high oscillator specification is required at both ends. Not really heard by listeners (quality not high). 22.214.171.124 The Aeronautical HF System and Other SSB Systems These use SSB
field strength of at least 50 dB above the desired full strength of any assignable channel, 100 kHz or more away from assigned channel or designated signal’. conclusion is that this annoyance can be tolerated by both data and voice users, provided they are separated by at least one 25 kHz channel. In addition, in a busy sky with high PIAC and consequently a heavy-loaded VDL2, the retransmissions due to data/voice collisions can be kept round about the 2 % mark. The same problem exists between
10 times the cost of a conventional ‘open’ first mobile system, such as the VHF AM(R)S system. Certainly the technical specification is usually up by a grade or two in overall performance; it is also where the term ‘military spec’ has been gleaned. 4.4 The Requirement for a New Tactical Military System The design specifications for a mobile military communication system that embraces all aspects of military requirements from surveillance, reconnaissance to combat itself and all the support
corridors still used today). 4 INTRODUCTION Also, in automatic dependent surveillance (ADS) pilots will attain greater local traffic awareness and responsibility from regularly up-linking adjacent aircraft positions. There is also a strategy to move to greater automated air traffic control, fully computerized with intervention by exception or under conflict only. A new communication system will enable the move to these more efficient operations. This will become critical in the immediate
4 6 6 7 7 7 7 8 9 9 10 10 11 11 11 11 14 15 15 15 vi CONTENTS 2.5 2.6 2.7 2.8 2.4.3 Power Flux Density 2.4.4 Electric Field Strength 2.4.5 Relationship Between Field Strength and Transmitted Power Radio Geometry 2.5.1 Radio Horizon Calculations 2.5.2 Earth Bulge Factor – k Factor 2.5.3 Nautical Mile 2.5.4 Great-circle Distances Complex Propagation: Refraction, Absorption, Non-LOS Propagation 2.6.1 Refraction 126.96.36.199 Layer Refraction 188.8.131.52 Obstacle Refraction 2.6.2 Attenuation from