Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1993-04-22
1994-11-08
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
G01S 502
Patent
active
053631102
ABSTRACT:
A positioning system and method utilizing a plurality of artificial satellites, in which times of positioning time signals transmitted from at least four artificial satellites to a positioning available area are always made coincident with a standard time of a ground control station to maintain accuracy of the time. In the ground control station, phases of a receive PN code obtained from the time signal included in the positioning signal of the artificial satellite and a pseudo receive PN code obtained by delaying the standard time of the ground control station by a radio wave propagation time, measured in real time, corresponding to a range between the ground control station and the artificial satellite are compared, and from the detected time error, a time correction command signal is obtained and is transmitted to the artificial satellite to correct the time of the positioning time signal of the artificial satellite. As a result, the time of the positioning time signal can always be coincident with the standard time of the ground control station to maintain accuracy. As an original oscillator of the positioning time signals of the artificial satellites, a crystal oscillator can be used in place of an atomic clock.
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Hellner Mark
Mitsubishi Denki & Kabushiki Kaisha
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