BEACON-SUPPORTED POSITION ESTIMATION FOR SECURITY TAG

摘要

A tag controller is configured to interface with a security tag adapted to be disposed on a corresponding product in a monitoring environment. The tag controller includes processing circuitry configured to perform a tag position estimation by receiving information indicative of signal strength (e.g. RSSI) measured at the security tag relative to each of a plurality of locating beacons disposed in the monitoring environment, defining a ranking of subset of the locating beacons based on signal strength, determining a first midpoint between two of the selected number of the locating beacons having the lowest signal strengths, determining a second midpoint between the first midpoint and a locating beacon having a next lowest signal strength, looping until the last midpoint has been calculated. The location of the security tag is estimated as the last calculated midpoint.
Averaging of a number of last stored position estimations compensates for errors due to tag movement.