New PDF release: Aeronautical Radio Communication Systems and Networks

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 concept Governing Aeronautical Radio structures (pages 9–104):
Chapter three VHF conversation (pages 105–144):
Chapter four army conversation 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 flooring Installations and kit (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 info for Aeronautical Radio Communication Systems and Networks

Example text

2 Answer As can be seen from the results (even with nine decimal places taken) the Doppler effect has generally negligible effect on frequency accuracy. This is well catered for within the receive channel definition as shall be shown later. g. voice or raw computer data) into a suitable form so that it can be transmitted over the media involved (usually plain air with absorbing gases as described earlier). 26). 26 Modulation and demodulation. A carrier frequency is selected to suit propagation conditions, spectrum and frequency management constraints and ITU regulations and efficient and reliable transportation of the information across the media.

Probably the simplest form of AM is double side band amplitude modulation (DSB-AM). 28) DSB-AM is described mathematically as f c (t) = A cos(2π f c t + ϕ)π where f c (t) is the modulated signal output. 28 DSB-AM modulation. 29 Power spectrum for DSB-AM. where K is the unmodulated carrier amplitude and f m (t) is the baseband signal and f m (t) = a cos(2π f m t) So f c (t) = (K + a cos(2π f m t)) cos(2π f c t + φ) m (depth of modulation) = Now, let Modulating signal amplitude a = Unmodulated carrier amplitude K = 0.

1 The Ionosphere The ionosphere extends nominally from 60 to 400 km above the earth’s surface. It is so called as the particles in this region are easily ionized, giving it special electrical properties. 23). 23 HF reflection from the different layers. Theoretically, there is a number of layers that exist. The D layer runs from height 60 to 90 km and the E layer from 90 to 150 km. The F1 layer runs from 150 km to 250 km and the F2 layer from 250 km to 400 km. Daytime. 24). Night Time. In general, the D and E layers disappear and the F layer reflects frequencies below typically 10 MHz.

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Aeronautical Radio Communication Systems and Networks by Dale Stacey

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