Method and apparatus for locating a remote unit

Details Method and apparatus for locating a remote unit Method and apparatus for locating a remote unit

2006-02-07

2006-02-07

Ramos-Feliciano, Elseo (Department: 2687)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S041200

Reexamination Certificate

active

06996403

ABSTRACT:
A method and apparatus for locating a remote unit (or node) is provided herein. During operation, location-finding equipment (106) will determine a gross location of non-located nodes (104) by determining distances of the nodes (104) to reference nodes (105). Additionally an error estimate in the location for each node is determined. A first subset of nodes having relatively lower error estimates are “promoted” to reference nodes, and a second subset of nodes having higher error estimates are again located based on a distance to the newly-promoted reference nodes.

REFERENCES:
patent: 6728545 (2004-04-01), Belcea
patent: 2004/0005899 (2004-01-01), Nir et al.
patent: 2005/0064878 (2005-03-01), O'Meagher
Levanon, N. “Lowest GDOP in 2-D Scenario” IEEE Jun. 2000, vol. 147 No. 3.

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