Real-time method and system for locating a mobile object or person in a tracking environment
First Claim
1. 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.
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Abstract
A real-time method and system for locating a mobile object or person in a tracking environment. The method includes modulating a first carrier signal with a first packet including a first set of data to obtain a modulated first signal and transmitting the first signal. The first signal contains the first packet and has a first precision and a first range within the environment. The steps of modulating and transmitting are repeated until a modulated second signal is received 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 second signal is demodulated to obtain the second packet. Location is determined within the environment based on the second packet.
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Citations
40 Claims
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1. 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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A real-time system of locating a mobile object or person in a tracking environment, the system comprising:
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a plurality of sensors located in the tracking environment; and a tracking tag wearable by the person or attachable to the object, the tag being programmed to at least perform the steps of; (a) modulating a first carrier signal with a first packet including a first set of data to obtain a modulated first signal; (b) transmitting 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; (c) repeating steps (a) and (b) until a modulated second signal is received from the nearest sensor within a time period after step (b), 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; (d) receiving the second signal within the time period; (e) demodulating the second signal to obtain the second packet; and (f) determining location of the tag within the environment based on the second packet of the received demodulated second signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification