Satellites

How do they work?

NAVSTAR Global Positioning System Satellite

Uses

DirectTV, DBSNewsTelephonesCableGPSEmergency radio beacons

Components

ANY object that revolves around a planet (e.g. the moon)ArtificialOrbit, Apogee, and PerigeeCustom 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 shuttleOrbital Velocity and AltitudeLaunch Window

Types

Weather satellites (TIROS, COSMOS)Communications satellites (Telstar, Intelsat) transponder

Broadcast satellitesScientific satellites (Hubble telescope)Navigational satellites (GPS Navstar)Rescue satellitesEarth 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 MilesWeather

Communication

Communications Satellite

Asynchronous Orbits

Multiple passes80-1,200 miles Teledesic, LEOs

Observation (300-600 miles)3,000-6,000 miles Scientific

6,000-12,000 miles Navigation (GPS)

Polar Orbit

Low altitudePasses over the poles on each orbitMapping and photography

Teledesic: Low Earth Orbit Satellites (LEOs)

Network of Constellations“Internet-in-the-SkyTM”

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 TechnologyTerrestrial satellite

Northpoint

Current: Multiple

towers

Northpoint “cellular

network”

Northpoint Impact

Competition with cable and DBSFiber optics to allOpportunities for Geostationary satellitesSpectrum planning

Broadwave USA Inc.

Local serviceLocal and National ProgrammingCheaper