Satellites How do they work? NAVSTAR Global Positioning System Satellite.

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Presentation transcript:

Satellites How do they work? NAVSTAR Global Positioning System Satellite

Uses DirectTV, DBS News Telephones Cable GPS Emergency radio beacons

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

Sputnik 1 (October 4, 1957) Soviet Union A Thermometer A Battery A Radio transmitter Pressurized Nitrogen gas

3, 2, 1, Lift-off (Launch) Rockets and the space shuttle Orbital Velocity and Altitude Launch Window

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 (???)

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

Geostationary Orbits Positioned over the same area Normally, 22,223 Miles Weather Communication Communications Satellite

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

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

Teledesic: Low Earth Orbit Satellites (LEOs) Network of Constellations “Internet-in- the-Sky TM”

LEO Coverage 288 operational satellites, divided into 12 planes with 24 satellites each

LEO Service Optical Intense coverage Inter-Satellite Links

Next Generation (Northpoint) Northpoint Technology Terrestrial satellite

Northpoint Current: Multiple towers Northpoint “cellular network”

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

Broadwave USA Inc. Local service Local and National Programming Cheaper