Aeronautical Radio Communication Systems and Networks by Dale Stacey

By Dale Stacey

Content material:
Chapter 1 advent (pages 1–8):
Chapter 2 thought Governing Aeronautical Radio structures (pages 9–104):
Chapter three VHF verbal exchange (pages 105–144):
Chapter four army communique structures (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 verbal exchange platforms (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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Extra resources for Aeronautical Radio Communication Systems and Networks

Example text

What is this in dBμV/m? 1 Definition of Isotropic One of the most important concepts in radio engineering is that of an isotropic power source. e. e. the envelope of propagation is an outwardly expanding sphere); has no loss. Obviously this is an ideal situation that cannot exist in practice. 3). 2 Derivation of Free Space Path Loss Equation Consider a radio link that starts at point PTx and is being received at point PRx . Assume an isotropic transmitting source PTx (watts). e. consider this area as separate on the surface of the propagation sphere).

22) In the expression (2R + h), R is significantly larger than h and this portion of the expression can be seen to tend to or be approximated by 2R. 5 This formula holds true if one end of a path is approximately at sea level. 5 Radio horizon geometry. e. 6 Radio horizon geometry for two aircraft or two ‘high’-elevation sites. JWBK149-02 JWBK149-Stacey December 4, 2007 7:36 RADIO GEOMETRY 21 Example 7 (a) For an aircraft flying at ceiling (assume 10 km), what is the distance to the horizon? (b) What is the furthest apart two aircraft can be and still have LOS communications?

14) A more practical form is to have distance in kilometres and frequency in MHz. 15) This is, one of the most important radio formulae. It is reproduced in ITU Recommendation PN 525-2 ‘Calculation of free space attenuation’. JWBK149-02 JWBK149-Stacey December 4, 2007 7:36 THE ISOTROPIC POWER SOURCE AND FREE SPACE PATH LOSS 17 Example 5 Part A What is the worst-case free space path loss between an aircraft VHF transmitter and the receiving station 300 km away. Assume line of sight (LOS)! Part B Given a fixed transmitter power, in order to quadruple the amount of power received at the receiver, how much closer would an aircraft need to be?

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