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Satellite connectivity

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  1. Satellite connectivity Skills: none IT concepts: geostationary orbit, low-earth orbit, satellite footprint, applications, latency (ping time) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

  2. Where does this topic fit? • Internet concepts • Applications • Technology (communication) • Implications • Internet skills • Application development • Content creation (images)

  3. Satellite is slow and expensive, but may be the only possibility This dish will probably serve a village or rural Internet kiosk.

  4. Geostationary orbit about 22,000 miles 100 minutes 24 hours Low earth orbit about 500 miles

  5. A geostationary orbit for Internet connectivity

  6. 1945: Arthur C. Clarke’s geostationary satellite Fig. 2. Typical extra-terrestrial relay services. Transmission from A being relayed to point B and area C; transmission from D being relayed to whole hemisphere.

  7. Satellite footprint

  8. Satellite latency Radius of the earth is approximately 4,000 miles 22,000-4,000 = 18,000 2 X 18,000 = 36,000 Light travels 186,000 miles per second 36,000/186,000 = 193 milliseconds

  9. Low earth orbit (LEO) satellite constellations Teledesic GPS Animation Animation Iridium

  10. Satellite connectivity Skills: none IT concepts: geostationary orbit, low-earth orbit, satellite footprint, applications, latency (ping time) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.