Determining node location in a wireless network
First Claim
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1. A method for determining node location in a wireless network, comprising:
- receiving, at a receiver node, chirped signals, each chirped signal being broadcast from a transmitting node of a plurality of pairs of transmitting nodes in the wireless network, wherein the transmitting nodes of each pair share a common timeslot and transmit identical chirped signals, and wherein a location of the transmitting nodes is known;
detecting beat frequencies, wherein each beat frequency is created by a pair of the chirped signals broadcast from each of the pairs of transmitting nodes;
determining time delay differences between the chirped signals corresponding to each beat frequency, wherein each time delay difference is calculated by dividing the beat frequency of a pair of chirped signals by a frequency rate of change of the chirped signals;
determining differential distances of the pairs of transmitting nodes to the receiver node based on the time delay differences and the known location of the transmitting nodes; and
determining a location of the receiver node in view of the differential.
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Abstract
Transmitting nodes broadcast chirped signals on a wireless network. The transmitting nodes are time-synchronized with each other and location of the transmitting nodes is known. A receiver node detects beat frequencies created by pairs of chirped signals from different pairs of transmitting nodes. Time delay differences between chirped signals in respective beat frequency pairs are determined. The receiver node'"'"'s location is determined in view of the time delay differences.
16 Citations
14 Claims
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1. A method for determining node location in a wireless network, comprising:
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receiving, at a receiver node, chirped signals, each chirped signal being broadcast from a transmitting node of a plurality of pairs of transmitting nodes in the wireless network, wherein the transmitting nodes of each pair share a common timeslot and transmit identical chirped signals, and wherein a location of the transmitting nodes is known; detecting beat frequencies, wherein each beat frequency is created by a pair of the chirped signals broadcast from each of the pairs of transmitting nodes; determining time delay differences between the chirped signals corresponding to each beat frequency, wherein each time delay difference is calculated by dividing the beat frequency of a pair of chirped signals by a frequency rate of change of the chirped signals; determining differential distances of the pairs of transmitting nodes to the receiver node based on the time delay differences and the known location of the transmitting nodes; and determining a location of the receiver node in view of the differential. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus, comprising:
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a receiver node to receive chirped signals from a plurality of paired time-synchronized base stations having a known location, the chirped signals broadcast at assigned timeslots; a measurement module to measure a beat frequency created by received chirped signals from each pair of base stations; and a processing unit to; determine time delay differences between the chirped signals corresponding to each beat frequency, wherein each time delay difference is calculated by dividing the beat frequency of a pair of chirped signals by a frequency rate of change of the chirped signals; determine a differential distance of each pair of base stations to the receiver node based on the time delay difference and the known locations of the base stations; and determine a location of the receiver node in view of the differential distances associated with the pairs of base stations, wherein to receive the chirped signals, the receiver node is to; receive, in a timeslot, a first chirped signal from one of the base stations of the pair; and receive, in the timeslot of the first chirped signal, a second chirped signal from the other base station of the pair, wherein the first and second chirped signals are identical. - View Dependent Claims (9, 10, 11)
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12. A non-transitory computer-readable storage medium containing instructions, that when executed, cause a computer to:
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receive, at a receiver node, a pair of chirped signals broadcast from each of a plurality of paired time-synchronized base stations, the base stations within a same pair of base stations transmitting identical chirped signals; detect beat frequencies, wherein each beat frequency is created by a pair of the chirped signals broadcast from each of the pairs of base stations; determine time delay differences between the chirped signals corresponding to each beat frequency, wherein each time delay difference is calculated by dividing the beat frequency of a pair of chirped signals by a frequency rate of change of the chirped signals; determine a differential distance of each pair of base stations to the receiver node based on the time delay difference and the known locations of the base stations; and determine a location of the receiver node via triangulation in view of the determined differential distances associated with the pairs of base stations, wherein to receive the chirped signals, the instructions are to cause the computer to; receive, in a timeslot, a first chirped signal from one of the base stations of the pair; and receive, in the timeslot of the first chirped signal, a second chirped signal from the other base station of the pair, and wherein the first and second chirped signals are identical. - View Dependent Claims (13, 14)
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Specification