Method for improving the accuracy of a wireless location system

Details Method for improving the accuracy of a wireless location system Method for improving the accuracy of a wireless location system

1999-01-12

2000-08-01

Tarcza, Thomas H.

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

Directive

Including a satellite

342457, G01S 302, G01S 502

Patent

active

060973366

ABSTRACT:
A method for locating a mobile transmitter comprises the steps of (a) making a first estimate of the location of the mobile transmitter on the basis of a first transmission from the mobile transmitter; (b) causing the mobile transmitter to emit a second transmission; (c) making a second estimate of the location of the mobile transmitter on the basis of the second transmission; and (d) combining at least the first and second estimates to obtain an improved, more accurate estimate of the location of the mobile transmitter. Step (b) may comprise auditing the mobile transmitter to elicit an audit response, or terminating the call (hanging up) and then initiating another call by paging the mobile transmitter to elicit a page response. Step (d) preferably comprises averaging a plurality of statistically-independent location estimates.

REFERENCES:
patent: 4728958 (1988-03-01), Choate
patent: 5327144 (1994-07-01), Stilp et al.
patent: 5490073 (1996-02-01), Kyrtsos
patent: 5515062 (1996-05-01), Maine et al.
patent: 5526357 (1996-06-01), Jandrell
patent: 5608410 (1997-03-01), Stilp et al.
patent: 5786790 (1998-07-01), Abbott
patent: 5890068 (1999-03-01), Fattouche et al.

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