System and Method for Locating Wireless Nodes
First Claim
1. A tracking system, comprising:
- a network;
a plurality of signal sources communicatively coupled to the network, the plurality of signal sources configured to transmit substantially identical signals; and
an RFID tag configured to receive the substantially identical signals from the plurality of signal sources, determine points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the user device.
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0 Petitions
Accused Products
Abstract
A tracking system includes a network; a plurality of signal sources communicatively coupled to the network, the plurality of signal sources configured to transmit substantially identical signals; and an RFID tag configured to receive the substantially identical signals from the plurality of signal sources, determine points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the user device. In some embodiments, the plurality of signal sources comprise a single transmitter and a predetermined plurality of substantially identical antennas coupled to the single transmitter by cables of a substantially same length.
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Citations
20 Claims
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1. A tracking system, comprising:
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a network; a plurality of signal sources communicatively coupled to the network, the plurality of signal sources configured to transmit substantially identical signals; and an RFID tag configured to receive the substantially identical signals from the plurality of signal sources, determine points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the user device. - View Dependent Claims (2, 3, 4, 5)
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6. A method for tracking a device, comprising:
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transmitting a plurality of substantially identical signals from a plurality of signal sources; receiving the substantially identical signals at an RFID tag from the plurality of signal sources; and determining points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the RFID tag. - View Dependent Claims (7, 8, 9, 10)
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11. A tracking device, comprising:
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a transceiver for receiving a plurality of substantially identical signals from a plurality of signal sources; a location processing module operably coupled to the transceiver and configured to identify a phase difference in the substantially identical signals, the location processing module further configured to identify a point of intersection of curves defining the phase differences between pairs of the plurality of substantially identical signals. - View Dependent Claims (12, 13, 14)
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15. A computer program product including tangible machine readable instructions for tracking a device, the instructions for:
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transmitting a plurality of substantially identical signals from a plurality of signal sources; receiving the substantially identical signals at an RFID tag from the plurality of signal sources; and determining points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the RFID tag. - View Dependent Claims (16, 17, 18, 19)
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20. A computer program product including tangible machine readable instructions for tracking a device, the instructions for:
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receiving a plurality of substantially identical signals from a plurality of signal sources at an RFID tag; and determining points of intersection from hyperbola curves defining phase differences between the substantially identical signals, a point of intersection of three hyperbola curves defining a location of the RFID tag; wherein the plurality of signal sources comprise a plurality of antennas coupled via same length cables to a single transmitter.
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Specification