Locating method for RFID indoor locating system

A positioning method and indoor positioning technology are applied in the positioning field for RFID indoor positioning systems, which can solve problems such as increased cost, unsatisfactory positioning effect, and interference.

Inactive Publication Date: 2009-11-25
SOUTH CHINA UNIV OF TECH
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  • Claims
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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 i

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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

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[0038] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the scope of protection claimed by the present invention is not limited to the scope expressed in the embodiments.

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

[0040] Choose M=16, 16 actual reference labels can form a comple...

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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 value of 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 the position 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 cluster analysis 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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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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