Inmarsat's major satellite constellation consists of 4 Inmarsat-3 satellites in geostationary orbit. Between them, the main ("global") beams in the satellites provide overlapping coverage with the whole surface on the Earth apart from the poles. So, thanks to Inmarsat, it is becoming feasible to extend the reach of terrestrial wired and cell networks to almost anyplace on Earth.
A geostationary satellite follows a circular orbit in the plane on the Equator at a height of 35,600km, to ensure it appears to hover over a selected point around the Earth's surface. Three this sort of satellites are enough to cover most on the globe, and mobile users hardly ever have to switch from a single satellite to another. Other cellular satellite methods use larger numbers of satellites in lower, non-geostationary orbits. On the user's point of view, they move across the sky in a comparatively high speed, often requiring a switch from one particular satellite to yet another in mid-communication and definitely risking the possibility of an interrupted call.
A call from an Inmarsat cellular terminal goes directly to the satellite overhead, which routes it back down with a gateway on the ground named a land earth station (LES). From there the call is passed into the public phone network.
The Inmarsat-3 satellites are backed up by a fifth Inmarsat-3 and four previous-generation Inmarsat-2s, also in geostationary orbit.
A critical advantage with the Inmarsat-3s over their predecessors is their ability to produce a number of spot-beams likewise as single large world wide beams. Spot-beams concentrate extra energy in areas of high demand likewise as making it probable to supply standard products and services to smaller, simpler terminals.
Inmarasat is a consortium of leading worldwide telecommunications companies originally established in 1991. The Inmarasat system is made to provide substantial high quality satellite-based services into a broad range of customers, including:
* Voice calling * Short Messaging Support (SMS) * Roaming * Positioning * Facsimile * Data transmission
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