Positioning system for CDMA/PCS communications system

Details Positioning system for CDMA/PCS communications system Positioning system for CDMA/PCS communications system

1998-02-17

2000-11-14

Hunter, Daniel S.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455561, H04Q 720

Patent

active

061482196

ABSTRACT:
Base station and system modifications to a digital cellular telephone system that measures location of a mobile station from its normal transmissions, and can forward the measured position to that station or some other authorized caller or service on the communication network. Range measurement is enabled without modification of mobile station equipment because of the synchronization between received pulse epochs and transmitted ones that are required for normal operation in digital telephony. Range measurement is made at a base station currently in contact with the mobile station by measuring the time interval from the start of its own transmitted pulse epoch to the start of a pulse epoch subsequently received from the mobile station, then dividing that time interval by twice the velocity of radio waves. Direction from the base station is determined, in a preferred embodiment, by use of a planar phase steered antenna array synchronized to pulse sequences from the mobile station.

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