Wireless user position update using infrastructure measurements

Details Wireless user position update using infrastructure measurements Wireless user position update using infrastructure measurements

1998-11-19

2000-12-26

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

455456, G01S 502, H04B 7185, H04Q 720

Patent

active

061666858

ABSTRACT:
A method and apparatus for tracking the position of a mobile unit in a mobile radio communication system using information from earth-orbiting satellites and information received from the infrastructure of the system, wherein the infrastructure consists of equipment associated with transmitting and receiving voice or data traffic to and from the mobile phone. An initial position of the mobile unit is calculated using measurements from earth-orbiting satellites. Next, one or more range measurements are made using signals transmitted between the mobile unit and the infrastructure. A positional difference between the initial position and a current position of the mobile station is estimated using the one or more range measurements, wherein only range measurements made from signals transmitted between the mobile unit and the infrastructure are used to perform the estimating. An accuracy value is next determined for the estimated positional measurement, and the accuracy value is compared to a threshold to determine whether the estimated positional measurement has an acceptable accuracy. If the estimated positional measurement has an acceptable accuracy, then the initial position of the mobile unit is updated using the estimated positional measurement and the process is repeated using only range measurements made from signals transmitted between the mobile unit and the infrastructure; otherwise, a new initial position is determined from the earth-orbiting satellites and the process is repeated.

REFERENCES:
patent: 5873040 (1999-02-01), Dunn et al.

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