RFID device, methods and applications
First Claim
1. A method for localization of an object in indoor environments, the method comprising:
- illuminating a sensor tag with electromagnetic radiation generated from a transceiver;
the transceiver being located a distance away from the sensor tag;
the sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation;
receiving backscattered electromagnetic radiation from the at least one NLTL at three or more locations;
coordinates of the three or more locations being known;
obtaining, from phase and magnitude outputs at a second harmonic and at least one subharmonic of second harmonic, a distance from the sensor tag to each of the three or more locations; and
trilaterating a location of the sensor tag.
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Accused Products
Abstract
Systems and methods for ranging in indoor environment that are accurate and that are substantially undisturbed by multipath interference. The method includes illuminating a sensor tag with electromagnetic radiation generated from a transceiver; the transceiver are being located a distance away from the sensor tag; the sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation, receiving backscattered electromagnetic radiation from the at least one NLTL at three or more locations; coordinates of the three or more locations being known, obtaining from the phase and magnitude outputs at a second harmonic and at least one sub harmonic of second harmonic, a distance from the sensor tag to each of the three or more locations and trilaterating a location of the sensor tag.
30 Citations
28 Claims
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1. A method for localization of an object in indoor environments, the method comprising:
- illuminating a sensor tag with electromagnetic radiation generated from a transceiver;
the transceiver being located a distance away from the sensor tag;
the sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation;receiving backscattered electromagnetic radiation from the at least one NLTL at three or more locations;
coordinates of the three or more locations being known;obtaining, from phase and magnitude outputs at a second harmonic and at least one subharmonic of second harmonic, a distance from the sensor tag to each of the three or more locations; and trilaterating a location of the sensor tag. - View Dependent Claims (2, 3, 4, 5, 6)
- illuminating a sensor tag with electromagnetic radiation generated from a transceiver;
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7. A system for localization of an object in indoor environments, the system comprising:
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a sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation; a transceiver; and a reader comprising; three or more antennas, each one antenna from the three or more antennas being located at one location from three or more locations;
coordinates of the three or more locations being known;at least one demodulator providing inphase and quadrature outputs at a second harmonic of a principal frequency of the electromagnetic radiation emitted from the transceiver and at one or more subharmonics of the second harmonic; and a ranging component configured to provide, from the inphase and quadrature outputs at the second harmonic and at the one or more subharmonics, a distance from each one of said three or more locations to the sensor tag. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for localization of an object in indoor environments, the method comprising:
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illuminating a sensor tag with electromagnetic radiation generated from a transceiver;
the transceiver being located a distance away from the sensor tag;the sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation; receiving backscattered electromagnetic radiation from at least three or more locations;
coordinates of the three or more locations being known;obtaining from phase and magnitude outputs at a second harmonic frequency, a distance from the sensor tag to each of the three or more locations; and trilaterating a location of the sensor tag. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system for localization of an object in indoor environments, the system comprising:
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a sensor tag comprising at least one nonlinear transmission line (NLTL) for broadband harmonic generation; a transceiver; and a reader comprising; three or more antennas, each one antenna from the three or more antennas being located at one of three or more locations;
coordinates of the three or more locations being known;at least one demodulator providing in-phase and quadrature outputs at a second harmonic of a principal frequency of the electromagnetic radiation emitted from the transceiver; and a ranging component configured to provide, from the in-phase and quadrature outputs at the second harmonic, a distance from each one of said three or more locations to the sensor tag. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification