Signature matching for location determination in wireless commun

Details Signature matching for location determination in wireless commun Signature matching for location determination in wireless commun

1998-02-18

2000-08-22

Bost, Dwayne D.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455422, H04Q 720

Patent

active

06108557&

ABSTRACT:
A method and apparatus improves the accuracy of a wireless location finding system based on the use of multipath signal signatures. A location finding apparatus measures an array covariance matrix R of a signal. The covariance matrix is compared to a database of signatures comprising calibrated signal subspaces. The comparison is based on calculating the projection of R onto each calibrated subspace. From these calculations a set of likely locations is then determined.

REFERENCES:
patent: 5327144 (1994-07-01), Stilp et al.
patent: 5512980 (1996-04-01), Herrick
patent: 5570412 (1996-10-01), LeBlanc
patent: 5602903 (1997-02-01), Leblanc et al.
patent: 5608410 (1997-03-01), Stilp et al.
patent: 5634199 (1997-05-01), Gerlach et al.

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