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Multi-direction collection combined clustering WiFi fingerprint indoor positioning method

An indoor positioning and multi-directional technology, which is applied to services based on location information, services based on specific environments, electrical components, etc., can solve the problems of less research on the establishment of fingerprint databases, achieve small errors, reduce positioning time, and improve positioning The effect of precision

Inactive Publication Date: 2018-11-23
GUIZHOU UNIV
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AI Technical Summary

Problems solved by technology

The establishment of the fingerprint library in the offline stage of indoor positioning has a great impact on the accuracy and speed of positioning, but now most of the research is concentrated on the matching algorithm research in the online stage, and there is little research on the establishment of the fingerprint library. Research to improve the accuracy and speed of positioning

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  • Multi-direction collection combined clustering WiFi fingerprint indoor positioning method
  • Multi-direction collection combined clustering WiFi fingerprint indoor positioning method
  • Multi-direction collection combined clustering WiFi fingerprint indoor positioning method

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Embodiment 1

[0045] Embodiment 1: a kind of WiFi fingerprint indoor positioning method that multi-direction collection combines clustering, this method comprises the following steps:

[0046] (1) Since the WiFi communication protocol uses IEEE 802.11, its signal frequency is 2.4GHz, and 70% of the human body is water, and the resonance frequency of water is the same as the frequency of the WLAN signal, so the human body is the transmission of the WLAN signal. A very important source of interference, and in the process of data collection, single-direction collection often ignores the impact of personnel participation on the signal, in order to improve this, multi-directional collection, such as figure 2 As shown in the figure, the signal collector holds the signal collector and collects multiple sets of signals in different directions at the same reference point. Considering that the angle deflection is too small and the signal gap is too small, four directions are selected for collection. ...

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Abstract

The invention discloses a multi-direction collection combined clustering WiFi fingerprint indoor positioning method. The method comprises the steps that (1), a signal collector selects east, west, south and north directions for signal strength value collection; (2), signal strength values in the (1) are denoised; (3), fingerprint data is clustered, indexes are established, and after the final element is screened completely, signal strength in each location fingerprint is sorted according to a descending order; and (4), classes which have H maximum values the same as those of to-be-measured point signals are found according to a set of each cluster in the (3), and coordinate locations of the to-be-measured points are computed through adoption of K-nearest neighbor. According to the method,a multi-direction collection method and a denoising clustering method are employed for fingerprint library production. Compared with a traditional fingerprint positioning method, the method has the advantages that the positioning precision is improved by 15%, the positioning time is reduced by 20%, and the defect that in a traditional WiFi fingerprint positioning process, the data processing is not reasonable enough, the fingerprint library reliability is low and the positioning timeliness is low is effectively solved.

Description

technical field [0001] The invention relates to a multi-directional collection combined with clustering WiFi fingerprint indoor positioning method, belonging to the technical field of fingerprint indoor positioning methods. Background technique [0002] "Where am I" has always been a common concern of people. We can use GPS for positioning outdoors, but when we are indoors, due to the occlusion of the roof, the GPS signal is seriously attenuated, making it impossible to locate. How to accurately and quickly locate the position of people indoors has become a hot and difficult research topic nowadays. [0003] At present, mainstream indoor positioning technologies include Bluetooth positioning, ultra-wideband positioning, Zigbee positioning, infrared sensor positioning, WiFi positioning, etc., but most other positioning methods require special hardware facilities or conditions to achieve accurate positioning, and WiFi indoor positioning is due to It is widely favored for its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04W4/021H04W4/33
CPCH04W4/021H04W4/33H04W64/006
Inventor 常津铭王红蕾
Owner GUIZHOU UNIV
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