Inmarsat was chartered as an intergovernmental organization (IGO) in 1979 to exploit the emerging satellite technology for mobile communications to improve maritime communications, specifically to improve safety of existence at sea. In view on the potential future benefits of delivering positioning applications along with communications solutions for mobile users, the organization's official purposes integrated the authority to supply radio determination companies.
Inmarsat communications companies commenced in February 1982. Initially Inmarsat fulfilled its mandate using space resources leased from third parties. Since 1990, Inmarsat has utilized satellites specified, procured, owned, and operated internally. Its first and second generation satellite techniques provided maritime and later aeronautical and land cellular companies but did not include radio location-determination capabilities.
Throughout the evolution of the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it made a decision to consist of navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, created to supply the space capacity needed by WAAS and EGNOS.
Inmarsat-3 satellites alone, nonetheless, do not give sufficiently redundant coverage for EGNOS and WAAS to provide operational providers through their respective support areas. Moreover, much more GEOs will be required to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational existence.
Navigation Payloads. In 1989, Inmarsat cooperated using the European Room Agency (ESA) on its Navsat program studies, and this led to the development of specifications for navigation payloads to be embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use like a civil complement and overlay for augmenting GPS and GLONASS.
Five Inmarsat-3 satellites have been effectively launched in between 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 improve availability, integrity and accuracy of the main GPS and GLONASS navigation signals more than North America and Europe. Inmarsat is presently the only operating supplier of navigation payloads for SBAS, with two transponders leased via COMSAT for WAAS and two leased for EGNOS.
On April 15, 1999, Inmarsat became the very first intergovernmental organization to privatize, though it still maintains its crucial public service responsibilities for maritime security, even as a private firm.
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