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RFID device, methods and applications

A sensor tag, multi-location technology, applied in understanding the present teaching and other and further aspects, in the field of indoor real-time positioning systems, can solve problems such as inability to solve periodic ambiguity

Active Publication Date: 2015-05-06
CORNELL UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although RFID tags with harmonic generation have been proposed, the proposed tags cannot resolve the periodic ambiguity

Method used

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  • RFID device, methods and applications
  • RFID device, methods and applications
  • RFID device, methods and applications

Examples

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Embodiment Construction

[0021] The following detailed description is what is presently believed to be the best mode of implementing these teachings. This description should not be considered limiting, but merely serves to illustrate the general principles of these teachings, the scope of which is best defined by the claims. While these teachings have described various embodiments, it should be realized that these teachings are applicable to many further and other embodiments within the spirit and scope of the appended claims.

[0022] As used herein, the singular forms "a", "an" and "the" include plural reference unless the context clearly dictates otherwise.

[0023] Unless otherwise indicated, all numbers expressing amounts of starting materials, reaction conditions, etc. used in the specification and claims are to be understood as being modified by the term "about".

[0024] As used herein, "trilateration" is the process of determining the coordinates of a node given its distance from three or mo...

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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.

Description

Background technique [0001] The present disclosure relates to indoor real-time location systems (RTLS), methods and related applications. [0002] Short-range, high-accuracy positioning is important for many applications such as indoor navigation, body area network (BAN), and obstacle-free motion tracking. On the other hand, the recent development of radio frequency identification (RFID) systems for efficient asset management has made low cost and low power consumption RFID tags and related devices widely available. Among RFID positioning methods, Received Signal Strength (RSS) is widely used, but suffers from poor accuracy. Time-of-flight (TOF) is not suitable for short distances due to the difficulty of measuring small round-trip time delays. A continuous wave (CW) phase based approach using a single tone carrier is preferred because of its high accuracy and simple architecture. [0003] However, passive CW phase localization via backscattered RFID tags is challenging in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/06G01S5/14G06K19/07G06K17/00
CPCG01S13/38G01S13/84G01S13/878G01S2013/466G06K7/10366
Inventor E·C·阚Y·马
Owner CORNELL UNIVERSITY
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