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High Speed Internet Forum / Service Providers / DSL / re:What's your experience with Satellite Internet service
Posted:  17 Mar 2010 08:21

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There are over 300 communications satellites in the geostationary orbit, directly above the equator, spaced typically 2 or 3 degrees apart. Because they orbit the earth at the same speed and in the same direction as the earth rotates they remain fixed in the sky and you can use a fixed pointing very small aperture terminal (VSAT) to communicate. The maximum possible coverage area from any one orbit position is approx one third of the earth, as that is all that is visible from the orbit position at a height of 35726 km. For example, a  satellite above the equator to south of India can provide coverage which includes South Africa, Europe to Japan and Australia, as well as India which is almost directly below it. To help with small dish broadband satellite operations spot beams are pointed down at particular areas. This web site shows many such beam coverage areas. In general smaller spot beams permit smaller earth station dishes.  The satellites are owned by large multinational companies or by specific national companies. Intelsat, NewSkies and Eutelsat are examples of international and regional operators providing broadband internet via satellite capacity.



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