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Radio frequency identification (RFID)-technology-based indoor positioning system

An indoor positioning and technology technology, applied in the field of radio frequency identification, can solve the problems of signal interference, single location service, affecting positioning accuracy, etc., to improve reliability, improve data processing efficiency, and overcome the effects of positioning accuracy distortion.

Inactive Publication Date: 2012-01-04
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an indoor positioning system based on RFID technology, which overcomes the shortcomings of the existing RFID positioning system in terms of single location service, deployment of a large number of RFID devices, mutual signal interference, and affecting positioning accuracy. Constructing a positioning network combining virtual reference tags, reference tags and readers makes the deployment of the positioning system flexible, and at the same time expands the range of positioning areas, improves indoor positioning accuracy, and reduces system construction costs

Method used

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  • Radio frequency identification (RFID)-technology-based indoor positioning system
  • Radio frequency identification (RFID)-technology-based indoor positioning system
  • Radio frequency identification (RFID)-technology-based indoor positioning system

Examples

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Embodiment

[0063] like Figure 4 , deploy the positioning system in a laboratory of 17.7m×5.85m, set up 4 RFID readers (numbered R1-R4) in the positioning area, and arrange 12 reference tags 7 (numbered as RT1-RT12), in order to improve the positioning accuracy of the system, a large number of computers, cabinets (numbered T1-T16), etc. are arranged in the laboratory, and there are walls, doors, windows and other obstacles near the equipment. These indoor auxiliary facilities increase the environment. The level of complexity is similar to that of the actual application environment.

[0064] In the positioning experiment of this embodiment, the above-mentioned equipment configuration method is adopted, and the area within the coverage of the reference tag is recorded as the central area, and the boundary part of the regional positioning area is recorded as the peripheral area. 16 positioning test points are randomly selected, and 8 positioning points are selected. The test point is in th...

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Abstract

The invention discloses a radio frequency identification (RFID)-technology-based indoor positioning system. The system comprises an equipment management subsystem, a complex event processing subsystem, a real-time positioning subsystem, a track tracing subsystem and a mobile service subsystem. The system has the advantages that: the position of a moving object is obtained by structuring virtual reference label space in a positioning area by utilizing a classic signal propagation model, calculating a received signal strength indicator (RSSI) value by utilizing a reference label RSSI value based on a ranging mode, estimating an environment variable by adopting a classic logarithmic path loss model, structuring a virtual reference label matrix, and obtaining the RSSI value of the virtual reference label by using a weighted average value. Simultaneously, the problem that the positioning precision of the conventional RFID positioning system is distorted out of the area structured by the reference label; and single real-time positioning provided for a user is converted into a plurality of services such as real-time positioning, target tracing and the like provided for the user.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification and relates to an indoor positioning system based on RFID technology. Background technique [0002] The indoor positioning system is a positioning system proposed relative to the outdoor global positioning system (GPS). Since the satellite signal required for GPS positioning is very weak, it is basically impossible to locate successfully in the indoor environment. Therefore, it is suitable for indoor wireless environments. The positioning system will make up for this vacancy in the field of wireless positioning. [0003] In recent years, due to the non-line-of-sight identification of radio frequency identification technology (RFID) and the low cost of RFID tags, RFID technology has become the preferred technology for high-precision, low-cost, and large-scale target indoor positioning. Therefore, indoor positioning systems based on RFID Emerging in endlessly, but the existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 李军怀王峰李雪松
Owner XIAN UNIV OF TECH
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