Satellites

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Satellites

• How do they work?

NAVSTAR Global Positioning System Satellite
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Uses

• DirectTV, DBS
• News
• Telephones
• Cable
• GPS
• Emergency radio beacons

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Components

• ANY object that revolves around a planet (e.g.
  the moon)
• Artificial
• Orbit, Apogee, and Perigee
• Custom built
• Space junk

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Sputnik 1 (October 4, 1957)

• Soviet Union
• A Thermometer
• A Battery
• A Radio transmitter
• Pressurized Nitrogen gas

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3, 2, 1, Lift-off (Launch)

• Rockets and the space shuttle
• Orbital Velocity and Altitude
• Launch Window

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Types

• Weather satellites (TIROS, COSMOS)
• Communications satellites (Telstar, Intelsat)
• transponder
• Broadcast satellites
• Scientific satellites (Hubble telescope)
• Navigational satellites (GPS Navstar)
• Rescue satellites
• Earth observation satellites (LANDST)
• Military satellites (???)

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Components

• Frame/Body (Bus)
• Power source
• Computer
• Communications
• Attitude control system (ACS)

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Geostationary Orbits

• Positioned over the same area
• Normally, 22,223 Miles
• Weather
• Communication

Communications Satellite
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Asynchronous Orbits

• Multiple passes
• 80-1,200 miles
• Teledesic, LEOs
• Observation (300-600 miles)
• 3,000-6,000 miles
• Scientific
• 6,000-12,000 miles
• Navigation (GPS)

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Polar Orbit

• Low altitude
• Passes over the poles on each orbit
• Mapping and photography

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Teledesic Low Earth Orbit Satellites (LEOs)

• Network of Constellations
• Internet-in-the-SkyTM

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LEO Coverage
288 operational satellites, divided into 12
planes with 24 satellites each
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LEO Service
Optical Intense coverage
Inter-Satellite Links
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Next Generation (Northpoint)

• Northpoint Technology
• Terrestrial satellite

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Northpoint

• Current
• Multiple towers
• Northpoint
• cellular network

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Northpoint Impact

• Competition with cable and DBS
• Fiber optics to all
• Opportunities for Geostationary satellites
• Spectrum planning

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Broadwave USA Inc.

• Local service
• Local and National Programming
• Cheaper