A satellite telephone, satellite mobile, or satphone is a cell phone that communicates immediately with orbiting communications satellites. It depends on the architecture of a specific system, coverage normally include the entire Earth, or merely particular regions.
The phone device, also referred to as a terminal or perhaps earth station, varies widely. A satellite phone handset has a range and weight comparable to that of a late nineteen eighties or early 1990s mobile phone, but mostly having a large retractable antenna. These are popular on escapades into remote regions where terrestrial cell service is inaccessible.
A fixed set up, such as used shipboard, include large, durable, rack-mounted electronics, and a steerable microwave antenna on the mast that immediately tracks the overhead satellites. Sat phones have notoriously poor coverage indoors, though it is possible to get a constant signal near a window or even within the top floor of a building if the roof is adequately thin. The phones have connectors for external antennae that are typically installed in vehicles and infrastructures.
Several satellite phones use satellites in geosynchronous orbit. These systems can maintain near-continuous global network having only three or 4 satellites, reducing the starting expenses.
The inconvenience of geostationary satellite systems is that numerous areas even where a very clear view of the sky is present the line of sight among the phone and the satellite is destroyed by obstacles for instance steep hills and jungle and the user will need to find higher landscape before having the capacity to use the phone. This is not the example with Low Earth Orbit (LEO) services - even though the network is obstructed by an obstacle anyone can wait a few minutes until another satellite passes overhead.
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