Proximity-based magnetic field generator for controlling...

Details Proximity-based magnetic field generator for controlling... Proximity-based magnetic field generator for controlling...

2005-02-08

2005-02-08

Vo, Don N. (Department: 2631)

Pulse or digital communications

Systems using alternating or pulsating current

C375S272000

Reexamination Certificate

active

06853687

ABSTRACT:
An object tracking system for locating radio-tagged objects within a monitored environment has a plurality tag transmission readers that detect RF transmissions from the tags, and generate output signals representative of the time-of-arrival of first-to-arrive tag transmissions. An object location processor processes the first to arrive signals in accordance with a multilateration algorithm to geolocate a tag. In order to modify the operation of a tag that comes within a prescribed region of the monitored environment (such as passing through a doorway), one or more relatively short range, magnetic field proximity-based, tag-programming ‘pingers’, are placed proximate to the region. A magnetic field receiver on the tag detects the field generated by the pinger and causes the tag to change operation such as increase its RF transmission rate.

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