Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite technologies for cellular communications to enhance maritime communications, exclusively to boost safety of life at sea. In view with the potential future benefits of supplying positioning applications along with communications solutions for cellular users, the organization's official purposes incorporated the authority to provide radio determination solutions.
Inmarsat communications solutions commenced in February 1982. Initially Inmarsat fulfilled its mandate using room resources leased from third parties. Since 1990, Inmarsat has applied satellites specified, procured, owned, and operated internally. Its initial and second generation satellite systems provided maritime and later aeronautical and land mobile products and services but didn't include things like radio location-determination capabilities.
All through the evolution in the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it decided to consist of navigation transponders on its third generation of geostationary satellites, Inmarsat-3, created to offer the space capability required by WAAS and EGNOS.
Inmarsat-3 satellites alone, nonetheless, don't give sufficiently redundant coverage for EGNOS and WAAS to provide operational products and services through their respective support areas. Furthermore, much more GEOs will be necessary to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational existence.
Navigation Payloads. In 1989, Inmarsat cooperated with the European Space Agency (ESA) on its Navsat system studies, and this led to the improvement of specs for navigation payloads for being embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use as a civil complement and overlay for augmenting GPS and GLONASS.
5 Inmarsat-3 satellites have been successfully launched concerning 1996 and 1998, each and every carrying a dedicated navigation transponder. As stated earlier, the Inmarsat-3 navigation transponders form an integral component of WAAS and EGNOS, which enhance availability, integrity and accuracy on the main GPS and GLONASS navigation signals around North America and Europe. Inmarsat is currently 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 first intergovernmental organization to privatize, though it even now maintains its essential public assistance responsibilities for maritime safety, even as a private firm.
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