Indoor positioning method based on RFID

An indoor positioning and positioning algorithm technology, applied in the field of RFID tag positioning of indoor systems, can solve problems such as redundant calculation, reduce the number of uses, eliminate some redundant calculations, and speed up positioning time.

Inactive Publication Date: 2020-05-12
ZHEJIANG UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

In practice, some reference tags may be far away from tracking tags, and a large number of redundant calculations may be generated when there are many reference tags

Method used

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  • Indoor positioning method based on RFID
  • Indoor positioning method based on RFID
  • Indoor positioning method based on RFID

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Embodiment Construction

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0034] refer to Figure 1 ~ Figure 3 , a RFID-based indoor positioning method, comprising the following steps:

[0035] Step 1: Set up 500 simulation experiments, deploy different numbers of reference tags, 4 readers, and a tag to be located in each experiment;

[0036] Step 2: Firstly, four readers collect the received signal strength values ​​of the positioning tags and all reference tags respectively, and obtain S 1 and θ={θ 1 ,θ 2 ..., θ n}, where the value of n is the number of each reference tag multiplied by the number of readers 4;

[0037] Step 3: Calculate the RSSI difference between the tag to be located and the reference tag in e...

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Abstract

The invention discloses an indoor positioning method based on RFID. The method comprises the following steps: deploying n RFID reader-writers, m reference tags and u to-be-positioned tags in a positioning area, calculating an RSSI difference value between a reference tag and a to-be-positioned tag on each reader-writer, comparing the obtained RSSI difference value with a threshold value by settingthe threshold value, if the RSSI difference value is greater than the threshold value, judging that the reference tag is not in the range of the to-be-positioned to-be-selected tag, and abandoning the tag; If the difference value is within the threshold range, retaining the reference tag, and obtaining the position of the to-be-positioned tag by adopting an LANDMARC positioning algorithm. Compared with the method for calculating the distance between each reference label in the positioning area and the tracking label, the positioning method has the advantages that the use number of the reference labels is reduced, part of redundant calculation can be eliminated, and the positioning time is shortened.

Description

technical field [0001] The invention relates to a method for realizing indoor positioning based on RFID, in particular to an RFID tag positioning method for an indoor system. Background technique [0002] At present, among many indoor positioning technologies, RFID has the advantages of non-contact, non-line-of-sight, low cost, and high positioning accuracy. It can achieve remote and non-contact inventory statistics and information management of items after placing electronic tags in a suitable way in advance. . [0003] Typical systems based on radio frequency identification (RFID) mainly include SpotON system and LANDMARC system, both of which are based on received signal strength method (RSSI). In terms of algorithm, the SpotON system uses an iterative algorithm to make the estimated value of the position gradually approach the real value. The iterative algorithm is not only greatly affected by the initial value, but also has a large amount of calculation, which cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/20G01S5/02G06K7/10
CPCG01C21/206G01S5/0252G06K7/10009
Inventor 吴哲夫吴文苑韩小飞
Owner ZHEJIANG UNIV OF TECH
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