REAL-TIME METHOD AND SYSTEM FOR LOCATING A MOBILE OBJECT OR PERSON IN A TRACKING ENVIRONMENT

摘要

A real-time method and system for locating a mobile object or person in a tracking environment in which a plurality of sensors are located are provided. The method includes providing a tracking tag wearable by the person or attachable to the object. The method further includes modulating a first carrier signal with a first packet including a first set of data to obtain a modulated first signal. The method still further includes 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. The method further includes repeating the steps of modulating and transmitting until a modulated second signal is received at the tag from the nearest sensor within a time period after the step of transmitting. The second signal contains a second packet including a second set of data and has a second precision and a second range within the environment. The method still further includes receiving the second signal at the tag within the time period. The method further includes demodulating the second signal to obtain the second packet. The method still further includes determining location of the tag within the environment based on the second packet of the received demodulated second signal.