A satellite telephone, satellite phone, or satphone is a cell phone that communicates straight with orbiting communications satellites. It depends on the structure of a specific system, coverage may include the rest of the Earth, or only particular regions.
The mobile tools, also called a terminal or perhaps earth station, differs widely. A satellite phone handset has a size and weight similar to that of a late 1980s or early 1990s mobile phone, however usually having a large retractable antenna. These are well-liked on getaway into isolated areas where terrestrial cell phone service is not available.
A fixed set up, such as used shipboard, may include large, durable, rack-mounted electronics, as well as a steerable microwave antenna on the mast that instantly tracks the overhead satellites. Satellite mobile phones have notoriously poor reception indoors, although it may be possible to get a constant signal near a window or within the top floor of a structure if the roof is properly thin. The mobile phones have connectors for external antennae that are often set up in vehicles and establishments.
Several satellite phones use satellites in geosynchronous orbit. These systems can maintain near-continuous global reception together with only 3 or 4 satellites, decreasing the launch charges.
The weakness of geostationary satellite systems is that numerous areas even where a large amount of open sky is present the line of sight among the mobile phone and the satellite is ruined by barriers such as steep mountain hills and forest and the user will need to find higher ground before having the ability to use the mobile phone. This is not the scenario with Low Earth Orbit (LEO) services - although the signal is clogged by an obstacle one can wait a few minutes until another satellite passes overhead.
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