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Satellite Communications

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Presentation Transcript

  1. Satellite Communications DirecTV and Satellite Radio

  2. Overview • Direct Broadcast Satellite • DirecTV • Satellite Radio • Background • Common Technology • Competitors • XM • SIRIUS • WorldSpace

  3. Direct Broadcast Satellite (DBS) • Direct Broadcast Satellite • Refers to either • Television Service • Satellites which deliver service • Mini-dish systems • Parabolic Surface • Focuses incoming signals into Feed Horn • Reflects outgoing signals into narrow beam • Main part Consists of Low Noise Blockdown Converter (LNB)

  4. Direct Broadcast Satellite (DBS) • Typical System • Operates in upper Ku Band (12 GHz to 14 GHz) • Legislation • C Band • Proprietary equipment needed • Encryption • Smart Card • Fixed Satellite Service (FSS) • Operates in C-Band (3.4 GHz to 7 GHz)

  5. DirecTVGood TV, Better TV, DirecTV • Technology • Satellites • Three geostationary satellites • Two more to be launched • 18 x 20 in elliptical dish • 5 LNB’s • High Definition • Access Cards • D2/P12 – Current Issue • Law suits • ISO-7186 Smart Card Device • MPEG-II Compression • 270 Mbps down to 10 Mbps

  6. Satellite Fleet

  7. Satellite Radio • Background • Digital Audio Radio Service (DARS) • Established in 1992 • Operates in S-Band (2.3 GHz) • 4 Second Delay • Main Competitors • North America • XM and Sirius • Europe, Middle East, Africa • WorldSpace • Terrestrial Repeaters (Cell Towers)

  8. XM Radio • Technology • Satellites • Two geostationary satellites • XM Rhythm at 115° west • XM Blues at 85° west • Replaced previous XM Rock and XM Roll • Third as a spare • Uses 12.5 MHz of S band: 2332.5 to 2345.0 MHz • GM, Honda

  9. XM Ground Repeaters

  10. SIRIUS Radio • Technology • Satellites • Three Medium Earth Orbit • Extremely Elliptical Path • At least one satellite for 14 hours per day. • Positions • Radiosat 1, Radiosat 2, Radiosat 3 • Fourth as a spare • BMW, Daimler-Benz, VAG

  11. SIRIUS

  12. WorldSpace • Technology • Operates in L-Band (1.467 GHz to 1.492 GHz) • Satellites • AfriStar, AsiaStar, AmeriStar

  13. Summary • Direct Broadcast Satellite • DirecTV • Satellite Radio • XM, SIRIUS, WorldSpace • Background • Technology • Satellites