Posted by: nbaground on: January 25, 2010
Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite technology for mobile communications to enhance maritime communications, specifically to improve safety of existence at sea. In view on the possible future benefits of providing positioning applications along with communications companies for mobile users, the organization's official purposes integrated the authority to provide radio determination solutions.
Inmarsat communications companies commenced in February 1982. At first Inmarsat fulfilled its mandate utilizing space resources leased from third parties. Since 1990, Inmarsat has employed satellites specified, procured, owned, and operated internally. Its first and second generation satellite techniques provided maritime and later aeronautical and land cellular companies but didn't consist of radio location-determination capabilities.
Throughout the evolution of the SBAS idea, Inmarsat played an active role in satellite navigation. In November 1990, it made a decision to include navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, created to present the space capacity needed by WAAS and EGNOS.
Inmarsat-3 satellites alone, on the other hand, do not give sufficiently redundant coverage for EGNOS and WAAS to provide operational services all through their respective support places. Moreover, more GEOs will be essential to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational existence.
Navigation Payloads. In 1989, Inmarsat cooperated with the European Room Agency (ESA) on its Navsat program studies, and this led towards the improvement of specifications for navigation payloads to be embarked on geostationary satellites. Inmarsat then adopted these specs 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 had been effectively launched involving 1996 and 1998, every 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 over 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 1st intergovernmental group to privatize, though it still maintains its critical public service responsibilities for maritime security, even as a private business.
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