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Ultrahigh frequency RFID label accurate positioning method based on label coupling effect

An RFID tag and precise positioning technology, which is applied in the field of ultra-high frequency RFID tag precise positioning, can solve the problems of GPS signal attenuation, high equipment cost, and low positioning accuracy, so as to improve positioning accuracy and efficiency, smoothness and denoising Good, to solve the effect of random error

Active Publication Date: 2018-09-18
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

The main disadvantage of this technology is that the GPS signal will be attenuated indoors due to the influence of buildings, resulting in low positioning accuracy, and the equipment cost of the locator is very expensive
The main disadvantage of this solution is that the signal processing is too complicated, the equipment cost is high, and the deployment difficulty is increased.
[0004] To sum up, the currently commonly used positioning technologies either have strict requirements on the environment, or need to rely on special equipment or complex algorithms

Method used

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  • Ultrahigh frequency RFID label accurate positioning method based on label coupling effect
  • Ultrahigh frequency RFID label accurate positioning method based on label coupling effect
  • Ultrahigh frequency RFID label accurate positioning method based on label coupling effect

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] The present invention is accomplished through following four steps:

[0037] Step 1) modeling label coupling;

[0038] In order to explain the interference phenomenon caused by coupling between RFID tags, the present invention studies the design of the tag antenna and the equivalent circuit of the antenna, models the phenomenon, and analyzes the scattering power of the tag pair.

[0039] The antenna design of the UHF passive tag is related to the working frequency of the tag and the way of communication between the tag and the reader. The tag uses backscattering technology to return energy to the reader antenna, and modulate information such as ID in the signal. Usually, the tags adopt the design method of half-wave dipole antenna. Since the working wavelength of the UHF tag is about 32 cm, the length of the half-wave dipole antenna is 16 cm, and this length i...

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Abstract

The invention discloses an ultrahigh frequency RFID label accurate positioning method based on a label coupling effect; based on existing business protocols, the method can use a business RFID deviceand a single antenna to accurately position a target label without pre-training a database. The method comprises the following steps: studying an antenna design mode of RFID labels, building an equivalent circuit and modeling a label coupling effect, and designing to obtain a reasonable interference label pair under theory support; enabling a RFID reader to work under a fixed frequency mode, moving the interference label pair, tracking influences on the target label RSS by the interference label pair, and accurately positioning the target label via signal processing and iteration positioning.The positioning method only needs one RFID antenna and a RFID label group to finish accurate positioning, includes absolute positioning and relative positioning, and is low in cost and high in precision.

Description

technical field [0001] The invention belongs to the field of radio frequency identification, and in particular relates to an ultra-high frequency RFID tag precise positioning method based on tag coupling. Background technique [0002] At present, target positioning is widely used in many fields, especially precise positioning is very important. It plays a prominent role in many applications. For example, the robot arm in the industrial system needs to perform precise movements during work, including grasping, lifting and other actions. Only by accurately determining the position of the operation target can the task be successfully performed. There are three main types of existing positioning methods: based on computer vision, based on GPS, and based on radio frequency signals. [0003] Computer vision-based technology mainly uses cameras or infrared sensors to obtain high-resolution position information of target objects, and uses planning and control algorithms to determin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/077G06K7/10
CPCG06K7/10019G06K7/10316G06K19/07773
Inventor 丁涵梁帆崔凯燕王鸽惠维韩劲松
Owner XI AN JIAOTONG UNIV
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