A construction method of wi-fi positioning fingerprint database based on image processing

A positioning fingerprint and image processing technology, applied in the field of information processing, can solve problems such as not describing the mathematical relationship well, achieve the effect of reducing calculation time overhead and improving positioning accuracy

Active Publication Date: 2018-12-04
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Such methods do not well describe the mathematical relationship between the fingerprint information of the location to be estimated and the fingerprint information of nearby locations

Method used

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  • A construction method of wi-fi positioning fingerprint database based on image processing
  • A construction method of wi-fi positioning fingerprint database based on image processing
  • A construction method of wi-fi positioning fingerprint database based on image processing

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Embodiment Construction

[0024] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0025] like figure 1 Shown is a schematic flow chart of an embodiment of the present invention. The implementation of the present invention is further specifically described through specific examples.

[0026] The reference points are evenly distributed. For example, the distance between adjacent reference points is d, and the target physical environment is meshed, and the distance between grid vertices (or reference points) is 2d;

[0027] Fingerprint information is collected at grid vertices, where the grid vertices and their received signal strengths from each wireless access point (AP) are regarded as pixels in an image and their corresponding gray values. Assuming that the total number of APs is K, K images can be obtained, and an all-zero matrix DATA with a size of D×K is defined, which is used to store the fingerprin...

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Abstract

The invention relates to a Wi-Fi (wireless fidelity) positioning fingerprint database construction method. The major problem for the positioning method based on signal fingerprints is indoor environment surveying and position fingerprint acquisition with the heavy workload. Besides, with the change of the indoor environment temperature, the layout and the like, the positioning accuracy is substantially reduced. The method comprises steps as follows: firstly, selecting the total number of reference points at equal intervals and acquiring RSS (received signal strength) at the selected reference points; then mapping physical positions of the reference points and corresponding signal fingerprints into small images, and enlarging the images with an improved bi-cubic image interpolation method; finally, performing image denoising with an adaptive median filter method, mapping the images into fingerprint information, filtering out singular points, obtaining RSS estimated values of all the reference points in the environment, and constructing a Wi-Fi positioning fingerprint database. The method can effectively reduce data acquisition manpower and time and can be applied to indoor wireless communication network environments.

Description

technical field [0001] The invention relates to the technical field of information processing, in particular to a fingerprint database construction under indoor Wi-Fi environment in the radio communication field. Background technique [0002] 1) Due to the development of wireless local area network, global microwave Internet, Bluetooth, Zigbee, ultra-wideband, 3G, 4G and other networks, people's demand for terminal positioning services is increasing, especially in complex indoor environments. After the Federal Communications Commission of the United States officially listed the provision of location information as an essential service for the 911 first aid in the United States, there has been an upsurge of research on wireless network terminal positioning technology at home and abroad. Currently more popular wireless positioning systems are shown in Table 1: [0003] Table I [0004] [0005] Due to the ubiquity of wireless local area networks, the indoor terminal posit...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/212G06F16/50
Inventor 周牧李双双田增山李坤鹏周非邵璐艳范馨月王向勇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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