Method and apparatus for covariance matrix estimation in a weigh

Details Method and apparatus for covariance matrix estimation in a weigh Method and apparatus for covariance matrix estimation in a weigh

1997-01-31

1999-03-16

Louis-Jacques, Jaques H.

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

701213, 701216, 342457, 342357, 342446, 73178R, G06G 778, G01S 302

Patent

active

058842152

ABSTRACT:
Signals exchanged between a fixed infrastructure (110-116) and a mobile unit (160) give rise to M channel quality metrics. The channel quality metrics are mapped, via predetermined relationships (501-503), in to M corresponding time of arrival variances, which in turn are used to derive M-1 time of arrival differential variances. A time of arrival differential weighting matrix including, in part, the time of arrival differential variances, is used to calculate a WLS solution, which solution is an estimate of a location of the mobile unit. This procedure may be implemented using an infrastructure-based location processor (130) operating in conjunction with the mobile unit, or may be performed by either the location processor or mobile unit alone.

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