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RFIC indoor-positioning method based on PSO

An indoor positioning and positioning label technology, which is applied in the fields of warehousing, logistics, and asset management, can solve the problems that two-dimensional positioning technology is difficult to three-dimensional space positioning, high environmental complexity in three-dimensional space, etc., and achieve the effect of improving positioning speed and positioning accuracy

Inactive Publication Date: 2014-08-06
TATWAH SMARTECH CO LTD
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AI Technical Summary

Problems solved by technology

Due to the higher environmental complexity of 3D space, it is difficult for the previous 2D positioning technology to be directly applied to 3D space positioning.

Method used

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  • RFIC indoor-positioning method based on PSO
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  • RFIC indoor-positioning method based on PSO

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Embodiment Construction

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1-4 As shown, a kind of RFID-based indoor positioning method steps includes:

[0030] Step 1: After deploying the entire positioning system hardware, the ILM algorithm saves all reference tags and their position coordinates on the server side, and establishes the distance matrix of the reference tags. The reference tags and tag position coordinates of the reference tags, the set of reference tags that can be read by the reader-writer with the number i is

[0031]

[0032] In the formula Indicates the reference label in the reader within the read range, capable of being read by the reader detected.

[0033] Step 2: Obtain all K reader-writer sets that can detect the tag T to be located and denote as

[0034]

[0035] And the readers in the set are sorted according to the RSSI value returned by the tag T detected by it. The smaller the ...

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Abstract

The invention discloses an RFIC indoor-positioning method based on particle swarm optimization (PSO). The RFIC indoor-positioning method is used for three-dimensional positioning of an article with an RFID electronic tag. According to the method, M reader-writers and N reference tags are deployed in an indoor environment in advance, and the reader-writers and the reference tags are distributed on the three-dimensional space in a grid mode; the distance between the electronic tag and some reader-writer is measured according to tag signal receiving strength and a wireless signal propagation model, and distance-measuring errors are reduced through the reference tags; after the distances between the electronic tag and the reader-writers are acquired, an error accumulation function can be obtained, the PSO is used for solving the reference value when the error accumulation function obtains the minimum value, and in other words, the spatial position coordinates of the electronic tag are obtained. Compared with a traditional method, the selecting process of the reference tags is optimized, measurement of parameters of the wireless signal propagation model is optimized, the PSO is introduced to solve the position coordinates of the electronic tag, and under the conditions that no hardware devices are added, the positioning speed is increased, and the positioning accuracy is improved.

Description

technical field [0001] The invention discloses an RFID-based indoor positioning method, which is used in the fields of logistics, warehousing, asset management and the like. Background technique [0002] Driven by the wave of the Internet of Things, the technical level of existing RFID equipment and application systems has been greatly improved, and RFID technology has been rapidly developed and widely used. Among many indoor positioning technologies, RFID has become a hotspot in the research and application of indoor positioning technology due to its low cost, non-contact, long recognition distance, and the ability to identify multiple tags at a time. [0003] The existing relatively mature indoor positioning methods are mainly used to solve two-dimensional spatial positioning problems, such as the most widely used LANDMARC algorithm and its subsequent improved VIRE algorithm and BVRE algorithm. In practical applications, more and more localization problems need to be solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/06G06K17/00G06F19/00
CPCG01S5/12G01S13/82
Inventor 赵文强蒋晖马明焱郭喜余强
Owner TATWAH SMARTECH CO LTD
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