Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite technology for mobile communications to improve maritime communications, particularly to boost security of existence at sea. In view with the possible future benefits of providing positioning applications together with communications services for mobile users, the organization's official purposes involved the authority to produce radio determination companies.
Inmarsat communications solutions commenced in February 1982. At first Inmarsat fulfilled its mandate using space resources leased from third parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its very first and second generation satellite methods offered maritime and later aeronautical and land cellular solutions but didn't consist of radio location-determination capabilities.
Throughout the evolution with the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it determined to include things like navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, developed to produce the space capacity needed by WAAS and EGNOS.
Inmarsat-3 satellites alone, however, do not give sufficiently redundant coverage for EGNOS and WAAS to provide operational products and services all through their respective support locations. Moreover, more GEOs will probably be necessary to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational existence.
Navigation Payloads. In 1989, Inmarsat cooperated with all the European Room Agency (ESA) on its Navsat system studies, and this led for the development of specifications for navigation payloads being embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use being a civil complement and overlay for augmenting GPS and GLONASS.
5 Inmarsat-3 satellites had been successfully launched concerning 1996 and 1998, each carrying a dedicated navigation transponder. As mentioned earlier, the Inmarsat-3 navigation transponders form an integral part of WAAS and EGNOS, which enhance availability, integrity and accuracy from the key GPS and GLONASS navigation signals around North America and Europe. Inmarsat is presently the only operating supplier of navigation payloads for SBAS, with two transponders leased through COMSAT for WAAS and two leased for EGNOS.
On April 15, 1999, Inmarsat became the primary intergovernmental group to privatize, though it nevertheless maintains its important public service responsibilities for maritime security, even being a private firm.
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