Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1994-11-16
1999-06-15
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455524, 455561, 455575, 342357, H04Q 720
Patent
active
059131705
ABSTRACT:
A differential positioning system (10) includes components of a satellite-based or land-based positioning system (12) and components of a mobile communications network (14). The differential positioning system (10) provides accurate and immediate position information to a mobile unit (17). A transmitter site (40) of a mobile communications network (14) is associated with a reference positioning receiver (38). The reference positioning receiver (38) generates correction data for transmission to the mobile unit (17). The mobile unit (17) includes a mobile communications device (42) for receiving the correction data generated by the reference positioning receiver (38) and a mobile positioning receiver (24) for generating a position fix. The mobile unit (17) refines the position fix generated by the mobile positioning receiver (24) using correction data received by the mobile communications device (42).
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Chin Wellington
HighwayMaster Communications, Inc.
Sobutka Philip J.
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