Position locating and communication system using multiple satell

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite

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342352, 342356, G01S 502, H04B 7185

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active

056192118

ABSTRACT:
A communication and position locating system (2) suitable for air traffic control is described. Multiple satellites (40) are provided in two geosynchronous constellations. One constellation (e.g., 4 satellites) has a first closed ground track (14). The other (e.g., 2 satellites (161, 182)) has a different ground track (18) or is geostationary, located outside of the first ground track (14). Geolocation information is transmitted by the satellites (40) to aircraft (28) and ground stations (26) so that aircraft (28) can determine their current position. A pseudo range correction map is provided to the aircraft (28) by the base stations (26) to permit differential geolocation measurements. The satellites (40) include communication transceivers (80) so that aircraft (28) can communicate voice and data to other aircraft (28) and to the ground stations (26, 30, 32) and automatically report their position to air traffic control centers (30), e.g., via the satellites (40). High positional accuracy over large geographic areas is obtained.

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An article "A Wireless World" by George Mannes, Popular Mechanics, Sep. 1994, pp. 67-70.
An article entitled "Efficient Spacing of Synchronous Communication Satellites" by Harrison. E. Rowe et al., The Bell System Technical Journal, Dec. 1968, pp. 2379-2433.
An article entitled "Proceedings Letters" from Proceedings of the IEEE, Sep. 1969, pp. 1655-1656.
Cline et al, "Quasicircular Ground Tracks For Geosynchronous Earth Satellites" J. Spacecraft, Bol. 23, No. 2, Mar.-Apr. 1986, pp. 144-148.
Shinji et al, "Orbit Allocation of Domestic Communications Satellites", Proc. of the IEEE, Sep. 1969, pp. 1655-1656.

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