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Indoor wireless positioning method based on RF (Radio Frequency) identification signal level

A signal level, indoor wireless technology, applied to record carriers, instruments, and induction record carriers used in machines, etc., can solve the problem of high positioning costs

Inactive Publication Date: 2015-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since more than 3 RFID readers are still required, the positioning cost is still high
Moreover, the system needs to use all reference labels as neighbor label candidates, so a lot of unnecessary calculations are introduced

Method used

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  • Indoor wireless positioning method based on RF (Radio Frequency) identification signal level

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Describe the present invention below in conjunction with specific embodiment:

[0024] The positioning scene in this embodiment is a square scene. The adopted indoor wireless positioning method based on the radio frequency identification signal level includes the following steps:

[0025] Step 1: Divide the indoor scene to be positioned into 3×3 square grids, each square grid has a side length of 2m, and place the same active electronic tag at the center of each square grid as a calibration point.

[0026] Step 2: Establish the energy level correspondence table of active electronic tags offline:

[0027] The corresponding table of signal energy level and distance S is:

[0028] signal energy level

Distance S between RFID reader and active electronic tag

L 1

S≤0.5m

L 2

0.5m

L 3

1m

L 4

S>2m

[0029] On the three circles of S=0.5m, S=1m and S=2m, select 10 different measurement points, and...

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PUM

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Abstract

The invention provides an indoor wireless positioning method based on a RF (Radio Frequency) identification signal level. The indoor wireless positioning method comprises the steps of: firstly dividing a to-be-positioned scene into grids and placing the same active electronic label serving as a correction point at the central position of each quadrate grid; then establishing an energy level corresponding table of the active electronic label offline; then measuring a RSS (Really Simple Syndication) value of each correction point by using a RFID (Radio Frequency Identification Device) reader on a to-be-positioned target to obtain a signal energy level of each active electronic label at the to-be-positioned target and a positioning region of each active electronic label; and finally positioning through logic judgment. According to the invention, only one RFID reader is needed, and the position of the unique RFID reader-writer in a system is determined by introducing an offline studying stage and utilizing preset electronic label signal energy level association.

Description

technical field [0001] The invention relates to the technical field of wireless positioning in an indoor environment, in particular to an indoor wireless positioning method based on a radio frequency identification signal level. Background technique [0002] RFID applications are already common, ranging from asset tracking, service industries, logistics and manufacturing to supply chains. The large number of applications of RFID has made the price of RFID hardware drop significantly, and stable equipment for automatic identification has been developed. RFID has obvious advantages, such as non-contact identification, non-line-of-sight readability, and so on. It is because of these capabilities that RFID technology can be used as the first choice for indoor positioning, although it was not originally designed and developed for this purpose. [0003] However, there are still many difficulties in using RFID positioning. First, the system requires a large number of devices to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/067G06K7/00
Inventor 张维李文涛田琦楠王嘉
Owner NORTHWESTERN POLYTECHNICAL UNIV