Posted by: nbaground on: January 25, 2010
A satellite telephone, satellite phone, or satphone is a handset that connects immediately with orbiting communications satellites. Based on the architecture of a specific system, coverage may include the entire Earth, or only some areas.
The phone equipment, also referred to as a terminal or perhaps earth station, varies widely. A satellite phone handset has a dimension and weight comparable to that of a late 1980s or early on 1990s phone, but mostly with a large retractable antenna. These are popular on escapades into remote areas where terrestrial cellular service is not available.
A fixed installing, like used shipboard, include large, rugged, rack-mounted electronics, and a steerable microwave antenna on the mast that immediately tracks the overhead satellites. Satellite phones have notoriously low reception indoors, though it may be possible to get a continuous reception near a window or even in the top floor of a building if the roof is adequately thin. The phones have connectors for external antennae that are frequently installed in vehicles and establishments.
Other satellite phones use satellites in geosynchronous orbit. These systems can easily maintain near-continuous global network with only three or 4 satellites, reducing the launch costs.
The weakness of geostationary satellite systems is that many locations perhaps even where a very clear view of the sky is present the line of sight between the phone and the satellite is destroyed by obstacles such as steep hills and forest and the consumer needs to find higher landscape before being able to use the phone. This is not the example with Low Earth Orbit (LEO) services - even if the signal is blocked by an obstacle one can wait a few minutes till another satellite transmits overhead.
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