Satellite Communication-P5

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  • Created by: Shannon
  • Created on: 08-04-13 10:27
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  • Satellite Communication
    • Longitudinal- sound wave
      • Transverse- light wave
    • Dish is bigger than the wavelength of microwaves
      • Little difraction
    • Diffraction through a gap
      • Wavelength=gap
        • Maximum diffraction
      • Little diffraction in microwave transmission
    • Low orbit- low frequencies
      • Geostationary-high frequencies
        • Parabolic transmission
          • Digital information
            • Transmission to satellite
              • Amplified and re transmitted- multiplexing, no interference
    • Ionosphere
      • Charged particles in the atmosphere.Waves can reflect and refract from here
      • Radio waves-TIR
        • Less than 30MHz-reflected
        • More than 30GHz-absorbed and scattered
  • Digital information
    • Transmission to satellite
      • Amplified and re transmitted- multiplexing, no interference

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