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Locating method for RFID indoor locating system

A positioning method and indoor positioning technology, applied in the field of positioning for RFID indoor positioning systems, can solve problems such as increased costs, interference, and unsatisfactory positioning effects

Inactive Publication Date: 2011-08-17
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has two disadvantages: first, the positioning effect is not ideal in a closed environment with severe multipath effects; second, in order to improve the accuracy, dense reference labels are needed to help estimate the position, which increases the cost and may cause Interference phenomenon

Method used

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  • Locating method for RFID indoor locating system
  • Locating method for RFID indoor locating system
  • Locating method for RFID indoor locating system

Examples

Experimental program
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Embodiment Construction

[0039] In a warehouse of 6m × 6m × 2.55m (length, width, height), the positioning method used in the RFID indoor positioning system can estimate the position of the item (the tracking tag is embedded on the item), such as figure 1As shown, M=16 actual reference tags are placed according to the two-dimensional square grid distribution, and the interval between each adjacent tag is 1.2m, N=6 tracking tags are randomly placed in the grid area, L= 4 readers are placed in the four corners of the room. Each physical grid unit covered by 4 actual reference labels is further divided into n×n (3×3) virtual grid units of equal size, and each virtual grid unit is covered by 4 virtual labels.

[0040] Select M=16, 16 actual reference labels can form a complete square grid diagram, and you can also choose M=4, 6, 9, 12, etc., to form a complete square grid diagram; the distance between adjacent actual reference labels Interval selects 1.2m, also can select 2m, determines interval accordin...

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Abstract

The present invention discloses a locating method for a RFID indoor locating system. The method includes that providing L of readers, placing M of actual reference label(s) and N of tracking label(s) according to a two-dimensional quadrate grid distribution, and calculating positions of virtual reference labels and corresponding RSSI of each reader through a virtual grid method; adjusting a suitable threshold based on the RSSI distribution status of the virtual labels adaptively, searching a neighboring virtual label of the tracking label by comparing the threshold with a RSSI difference valueof the tracking label and the virtual label, implementing a cluster analysis to the selected neighboring virtual label, and determining the position of the tracking label accurately according to theposition of the neighboring virtual label, a signal Euclidean distance weight value and a generic weight value thereof. By means of using a virtual label to replace an additional actual label, it is capable of reducing a system cost, eliminating a small probability position by regulating the threshold adaptively, enhancing the systemic flexibility, and improving a locating accuracy by the clusteranalysis of a large probability position.

Description

technical field [0001] The invention relates to a positioning method for an RFID indoor positioning system, in particular to a tracking tag positioning method for an RFID indoor positioning system. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification technology that emerged in the 1990s. Its basic principle is to use the transmission characteristics of radio frequency signals and spatial coupling (inductive or electromagnetic coupling) to realize automatic identification of specific objects. The characteristics of RFID technology are as follows: non-contact, non-line-of-sight, short delay, high precision, large transmission range and low cost. At present, positioning systems using RFID technology mainly include SpotON and LANDMARC. [0003] SpotON: By using the aggregation algorithm to analyze the RF signal strength, the three-dimensional positioning of the target is realized. But the system's key data integration and sensor fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G06K17/00
CPCG01S5/0278
Inventor 胡斌杰朱凤娟
Owner SOUTH CHINA UNIV OF TECH
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