WiFi position fingerprint positioning method based on weighted chi-square distances

A chi-square distance and fingerprint positioning technology, applied in positioning, measuring devices, instruments, etc., can solve problems such as instability and unreliable fingerprints, and achieve the effect of improving accuracy, positioning accuracy and stability, and improving positioning accuracy.

Inactive Publication Date: 2017-11-07
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] However, the defects of the prior art include: for example, patent number 201610695797.0, patent name: a WiFi fingerprint indoor positioning method, but the patent must delineate the positioning area, and need to establish the location fingerprint library LF...

Method used

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  • WiFi position fingerprint positioning method based on weighted chi-square distances
  • WiFi position fingerprint positioning method based on weighted chi-square distances
  • WiFi position fingerprint positioning method based on weighted chi-square distances

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] figure 1 Shown is the overall design framework of the WiFi indoor positioning system. The invention adopts a typical C / S (client / server) framework, and the system is composed of a mobile positioning terminal and a server. The mobile positioning terminal communicates with the server using HTTP, and the AP uses an existing router.

[0040] figure 2 As shown, select a space of 8m*5m as the area to be located, divide the area to be located according to a grid of 1m*1m, select the four vertices of the grid as reference points, and arrange 4 AP points in the area to be located.

[0041] The process of the offline phase is as follows image 3 As shown, the fingerprint database is constructed in the offline measurement stage, a suitable grid is established in the area to be located to select reference points, and the signal strength values ​​of the surround...

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Abstract

The invention discloses a WiFi position fingerprint positioning method based on weighted chi-square distances. According to the method, a reliable and stable fingerprint database is established, and positioning accuracy and effectiveness of positioning can be effectively improved. The method comprises the following steps of: S1: in an offline measurement stage, establishing the fingerprint database; S2: in an online positioning stage, according to a signal strength vector of each wireless access point AP, which is acquired by to-be-positioned points, calculating weighted chi-square distances of signal strength vectors of the to-be-positioned points and a fingerprint vector in the fingerprint database; S3: carrying out sorting from big to small on the weighted chi-square distances obtained by calculation, and selecting K reference points (K represents the number); and S4: according to position coordinates of the reference points, estimating position coordinates of the to-be-positioned points. The method adopts a variance filtering method in the offline measurement stage, so that noise values in signal strength values received at the reference points can be effectively removed, and accuracy of fingerprints in the fingerprint database is improved.

Description

technical field [0001] The invention relates to a WiFi position fingerprint positioning method based on a weighted chi-square distance, and belongs to the technical field of position positioning. Background technique [0002] With the rapid development of the mobile Internet and the widespread use of smart devices and mobile communications, the demand for location-based services is also increasing, and people's requirements for timely, accurate, and fast location information are also getting higher and higher. Today, outdoor positioning technology has developed relatively mature. GPS has been widely used in outdoor environments, can provide users with more accurate location services, and is widely used in people's production and life (such as Baidu maps and shared bicycles). GPS technology mainly relies on the propagation of signals in the air and buildings, but due to multi-path propagation and multi-site propagation phenomena such as refraction and diffraction of propagat...

Claims

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Application Information

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IPC IPC(8): H04W16/20H04W64/00G01S5/02G01S5/14
Inventor 解培中严乐李汀
Owner NANJING UNIV OF POSTS & TELECOMM
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