Patent ID: 8310364
Filing Date: 2012-11-13
Classification: G07C

Abstract:
1. A real-time method of determining and validating location of a relocated mobile object or person in a tracking environment in which a plurality of sensors are located, the method comprising: (a) providing a tracking tag having storage and wearable by the person or attachable to the object; (b) storing a set of data related to a prior location of a relocated tag in the tracking environment in the storage; (c) modulating a first carrier signal with a first packet including a first set of data to obtain a modulated first signal; (d) transmitting from the tag to a sensor nearest the relocated tag the first signal, the first signal containing the first packet and having a first precision and a first range within the environment; (e) receiving a modulated second signal at the tag from at least one of the sensors including the nearest sensor, the second signal containing a second packet including a second set of data and having a second precision and a second range within the environment; (f) demodulating the second signal to obtain the second packet; (g) repeating steps (c) through (f) if the second set of data is different from the stored set of data to obtain a plurality of second packets; and (h) determining and validating current location of the relocated tag within the environment based on the plurality of second packets.