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BTC107 3 Satellites
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    BTC107 3 Satellites BTC107 3 Satellites Presentation Transcript

    • BTC107 TV Systems & Signals Satellite Links Martin Uren
    • Satellite Orbits  How do satellites stay in orbit?  What are the main satellite orbits called?  What external factors affect an orbit?  What are inclined orbits? 2
    • Satellite Orbits 3
    • Satellite Orbits x x 4
    • Orbital Inclination +4° Satellite Latitude +2° Start of Equatorial 0° day 1 End of Plane day 7 -2° -4° Satellite Longitude -0.3° -0.2° -0.1 ° 0° + 0.1 ° + 0.2° + 0.3° 5
    • Geostationary Orbit  What does geostationary mean?  What does geosynchronous mean?  Why is the orbital period not 24 hours?  What is stationkeeping?  What is the satellite’s operational life expectancy? 6
    • Satellite Footprints  What is the footprint of a satellite?  What is the boresight?  What are the 4 main coverage beams?  What is slant range? 7
    • Satellite Footprints Astra 2 North Beam Astra 2D Footprint www.uktvabroad.info/satellite.html 8
    • Satellite Footprints Astra 2 South Beam Astra 2 North Beam www.brymar.co.uk/info/Astra/astra_sky/astra_sky.html 9
    • Coverage Beams  What are the 4 main coverage beams? www.satcom1.com 10
    • Uplinks & Downlinks  What is a satellite’s slant range? North Pole Ground Station Re SR max φ° Re SR θ° Re H Equator Geostationary Satellite 11
    • Satellite Links  What frequency bands are used for satellite links?  What types of antenna can be used?  What size & channel capacity are communications satellites?  What are the options for launching satellites?  What is a transponder?  What factors can affect the link performance of a satellite link? 12
    • Satellite Antennas  What are the main types of satellite antenna? 13
    • Satellite Images Astra 3A 14 www.boeing.com/defense-space/space/bss/factsheets/376/astra3a/astra3a.html
    • Satellite Images Intelsat 803 Astra 1L 15
    • BT @ Goonhilly commons.wikimedia.org Satellite Antenna One (Arthur) at Goonhilly 16
    • Satellite Launches  Where can satellites be launched from? Astra 1L Ariane 5 Launch Vehicle 17 www.space.com/missionlaunches/sfn_070504_ariane5_lnch.html
    • Satellite Launches  Sea Launch, from the pacific ocean! www.hammers.com/images/features/elv.jpg 18 www.yuzhnoye.com
    • Satellite Transponder  What is a transponder? Label the diagram 19
    • Atmospheric & Other Effects  Atmospheric attenuation  Ionosphere  Rain  Earth noise  Terrestrial interference  Eclipses 20