Global Star
Globalstar is a consortium of leading international telecommunications companies originally established in 1991 to provide satellite telephony services through a network of exclusive service suppliers.
Global Star has 48 low earth orbit (LEO) satellites in service for more than 100 countries and 6 continents.
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Inmarsat
Inmarsat was established in 1979 to serve the maritime industry by satellite communications in developing countries and emergency management of ships and Applications, meanwhile, is currently a global satellite system used by independent service providers to offer a variety of voice and multimedia communications for customers to move or in remote locations.
Inmarsat system consists of nine satellites in geostationary orbit.
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Iridium
The Iridium system, global, mobile, wireless communication system, which is scheduled for three Motorola engineers consits of subscriber mobile phones, 66 satellite constellation, the complete ground infrastructure, and all the supporting software.
Iridium system is the first commercial satellite system to include:
A large constellation in low Earth orbit
The inter-satellite links
processor board
electronic scanning antennas
Iridium system consists of a constellation of 66 LEO satellites. The system uses the L-band to provide global mobile communications handsets. Total project cost was over $ 4 billion.
Closed system recently after being unable to attract enought subscibers.The satellites will be allowed to burn in the atmosphere.
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Orbcomm
ORBCOMM is a leading global provider of commercial communications satellite LEO data. The system allows companies to track mobile assets and ORBCOMM meters away from a distance, such as trailers, railcars, locomotives and heavy equipment, monitor, utilities and oil and gas storage tanks, wells and pipelines and keep in touch with remote workers anywhere in the world.
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Teledesic
Teledesic is building a global network, broadband Internet-in SkyTM. Thanks to satellite technology, Teledesic and its partners create the first global network at affordable prices, worldwide, fiber optics as "access to telecommunications services such as computer networks, broadband Internet access , interactive multimedia and high-quality voice.
A day of service, Teledesic broadband enables companies, schools and individuals around the world. Teledesic network to accelerate the diffusion of knowledge throughout the world, and to facilitate the improvement of education, health and other important global issues. Teledesic is a privately held company headquartered in Bellevue, Wash., a suburb of Seattle.
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