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.

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.

CN101587182AInactive Publication Date: 2009-11-25SOUTH CHINA UNIV OF TECH
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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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Embodiment Construction

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

[0039] In a warehouse of 6m x 6m x 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 reference labels.

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

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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...

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Application Information

Patent Timeline
25 Nov 2009
Publication
CN101587182A
IPC
G01S5/02; G06K17/00
CPC
G01S5/0278
Inventors
胡斌杰; 朱凤娟