Real-time network node location system and method
First Claim
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1. A real-time network node location system, comprising:
- a tag to broadcast a plurality of signals;
a plurality of routers each comprising at least one omni-directional antenna to receive at least a first part of the plurality of signals and at least one directional antenna to receive at least a second part of the plurality of signals, the plurality of routers to transmit information identifying signal strengths of the at least the first part and the at least the second part of the plurality of signals; and
a location engine to;
process at least the information identifying the signal strengths of the at least the first part of the plurality of signals to determine a position of location of the tag; and
process at least the information identifying the signal strengths of the at least the second part of the plurality of signals to determine an area of location of the tag.
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Abstract
A real-time location system and method for a wireless network includes, in one embodiment: (a) obtaining received signal-strength indicator measurements between stationary routers and mobile devices; (b) determining the relative angles of mobile devices from stationary routers using directional antenna systems; and (c) using signal strength and angle information to calculate the location of mobile devices.
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Citations
34 Claims
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1. A real-time network node location system, comprising:
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a tag to broadcast a plurality of signals; a plurality of routers each comprising at least one omni-directional antenna to receive at least a first part of the plurality of signals and at least one directional antenna to receive at least a second part of the plurality of signals, the plurality of routers to transmit information identifying signal strengths of the at least the first part and the at least the second part of the plurality of signals; and a location engine to; process at least the information identifying the signal strengths of the at least the first part of the plurality of signals to determine a position of location of the tag; and process at least the information identifying the signal strengths of the at least the second part of the plurality of signals to determine an area of location of the tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for real-time determination of the location of a tag, comprising:
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(a) broadcasting, from the tag, a plurality of signals to a plurality of routers, each of the routers comprising one or more omni-directional antennas and one or more directional antennas; (b) receiving, by the one or more omni-directional antennas of each of the plurality of routers, at least a first part of the plurality of signals; (c) receiving, by the one or more omni-directional antennas of each of the plurality of routers, at least a second part of the plurality of signals; (d) transmitting, by each of the plurality of routers, to a location engine, information identifying signal strengths of the first part and the second part of the plurality of signals received; (e) processing, by the location engine, at least the information representing the signal strengths of the first part of the plurality of signals received by each router to determine a position of location of the tag; and (f) processing, by the location engine, at least the information representing the signal strengths of the first part of the plurality of signals received by each router to calculate an area of location of the tag. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system for determining a position of location of a tag, comprising:
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a plurality of routers each comprising at least one omni-directional antenna, the plurality of routers comprising at least three routers; and a location engine to; (a) determine for at least one router, from at least a part of signals sent by the one router and received by the at least one omni-directional antenna of each of at least one other of the routers, an average path loss of signal strength; (b) optimize, for at least the one router, multipath parameters in a radio-frequency (RF) signal propagation model equation using the average path loss for each of the at least one other of the routers and known distance between the router and each of the at least one other of the routers; and (c) determine the position of location of the tag using at least the optimized multipath parameters. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification