Radio frequency indoor positioning method based on virtual tag algorithm

A wireless radio frequency, virtual tag technology, applied in the field of radio frequency identification, can solve problems such as radio frequency signal interference

Inactive Publication Date: 2012-02-01
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a wireless radio frequency indoor positioning method based on a virtual reference tag algorithm, which overcomes the radio frequency signal interferen

Method used

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  • Radio frequency indoor positioning method based on virtual tag algorithm
  • Radio frequency indoor positioning method based on virtual tag algorithm
  • Radio frequency indoor positioning method based on virtual tag algorithm

Examples

Experimental program
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Embodiment

[0117] In order to verify the superiority of the positioning algorithm based on virtual reference tags in positioning accuracy, a series of comparative experiments were carried out between the positioning algorithm based on virtual reference tags and the LANDMARC algorithm. In the positioning experiment, the LANDMARC algorithm uses the number of adjacent reference tags K as 4 in order to obtain the best positioning accuracy, while the positioning algorithm based on virtual reference tags uses the aforementioned default settings in the experiment, and the two use the same The number of RFID readers and reference tags are placed in the same position, and then the positioning accuracy experimental results of the two are compared.

[0118] The entire positioning area is divided into three areas: the central area, the transition area, and the peripheral area according to the reference tag density and the distance from the reader, such as Figure 5 As shown, then evaluate the MEE of...

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Abstract

The invention discloses a radio frequency indoor positioning method based on a virtual tag algorithm. A reference tag is fixed at a proper position in a positioning area; the coordinate of the proper position is measured in a relatively easy way; the signal intensity of the reference tag is read through an arranged RFID (Radio Frequency Identification Device) reader/writer every a section of time so as to adapt to the influence of the environment factor variation on the positioning error; and the positioned tag is attached to a target to be positioned; estimating the position of the tag in the space through the positioning tag signal received by the RFID reader/writer, wherein the method is implemented according to the following steps of: first, estimating an environment variable, wherein the estimation includes path consumption index estimation and normal distribution standard deviation estimation; and then constructing a virtual reference tag; and finally, realizing the positioning algorithm according to the virtual reference tag. By using the indoor positioning method disclosed by the invention, the problem of radio frequency signal interference brought by the setting of the high-density reference tag in the prior art is overcome, and flexible layout of the reference tag is obtained; meanwhile, the range of the positioning area is expanded and the indoor positioning precision is improved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and relates to a wireless radio frequency indoor positioning method based on a virtual label algorithm. Background technique [0002] Radio Frequency Identification (RFID, Radio Frequency Identification) is a technology that uses radio frequency to conduct non-contact two-way communication through electromagnetic fields to achieve the purpose of identifying targets and realize non-contact automatic data exchange. At present, radio frequency identification technology has been widely used in production, logistics, transportation and other application fields, and has broad application prospects in unmanned automatic management fields such as location tracking and automatic scanning. Especially as the concept of "Internet of Things" (IoT, Internet of Things) has attracted widespread attention in the industry, as an advanced productivity, the wide application of RFID technology ...

Claims

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Application Information

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IPC IPC(8): G01S5/02
Inventor 李军怀王一乐于蕾
Owner XIAN UNIV OF TECH
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