Patent ID: 8514071

Claim:
A real-time method of locating a mobile object or person in a tracking environment in which a plurality of sensors are located, the method comprising: (a) providing a tracking tag wearable by the person or attachable to the object; (b) modulating a first carrier signal with a first packet including a first set of data to obtain a modulated first signal; (c) transmitting from the tag to a sensor nearest the tag the first signal, the first signal containing the first packet and having a first precision and a first range within the environment; (d) repeating steps (b) and (c) until a modulated second signal is received at the tag from the nearest sensor within a time period after step (c), 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; (e) receiving the second signal at the tag within the time period; (f) demodulating the second signal to obtain the second packet; and (g) determining location of the tag within the environment based on the second packet of the received demodulated second signal.