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UHF RFID tag ranging method based on multi-frequency carrier phase difference

A carrier phase difference and phase difference technology, applied in the field of the Internet of Things, can solve the problem that the label positioning has not been effectively solved

Active Publication Date: 2022-04-29
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the UHF RFID system has been widely used in the field of warehousing and logistics. The reading and writing functions of UHF RFID tags are very mature, but the problem of tag positioning has not been effectively solved, and a lot of research is needed

Method used

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  • UHF RFID tag ranging method based on multi-frequency carrier phase difference
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  • UHF RFID tag ranging method based on multi-frequency carrier phase difference

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Embodiment approach

[0020] In order to further illustrate the present invention, below in conjunction with figure 1 and figure 2 Give a specific example. This example is limited to illustrate an implementation method of the present invention, and does not represent a limitation to the scope of coverage of the present invention.

[0021] UHF RFID tag ranging system such as figure 2 shown. The system mainly includes UHF RFID reader, reader antenna, UHF RFID tag. The UHF RFID reader and antenna are connected using radio frequency cables. The UHF RFID reader and the tag work protocol are used together, and can be read and written. Tags need to be placed within range of the reader. To simplify the scenario, this implementation case includes only one UHF RFID reader, one reader antenna and one UHF RFID tag. The UHF RFID reader can send signals of multiple frequencies. Due to the integrated hardware structure of the transceiver, the UHF RFID reader can obtain the phase difference between the tr...

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Abstract

The invention relates to a UHF RFID tag ranging method based on multi-frequency carrier phase difference, and the adopted ranging system includes a reader, a radio frequency cable and an antenna. Include the following steps: Set the reader operating frequency to f 1 , use this frequency to read the tag; obtain the carrier phase difference between the tag’s backscattered signal and the reader’s transmitted signal at this operating frequency to obtain all n operating frequencies {f n} The carrier phase difference between the tag backscatter signal and the reader's transmitted signal is used to calculate the dual-frequency ranging distance; calculate the final ranging result; and obtain the distance from the tag to the reader antenna.

Description

technical field [0001] The invention belongs to the UHF RFID direction in the field of the Internet of Things, and belongs to a new UHF RFID tag ranging technology. Background technique [0002] With the development of the Internet and artificial intelligence, IoT applications have been popularized on a large scale. The UHF RFID system is considered to be a very valuable Internet of Things access technology due to its advantages of passive tags, no need for post-maintenance, low tag cost, convenient large-scale deployment, and long-distance reading and writing. Ideally, on the Internet of Things, every real object can be connected to the Internet of Things by using UHF RFID tags. At present, the UHF RFID system has been widely used in the field of warehousing and logistics. The reading and writing functions of UHF RFID tags are very mature, but the problem of tag positioning has not been effectively solved, and a lot of research is needed. At present, there are relatively ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/10G06K7/00
CPCG01S5/10G06K7/0008
Inventor 张云蕾刘开华马永涛
Owner TIANJIN UNIV
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