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Indoor positioning fingerprint grouping method based on signal statistics

An indoor positioning and grouping method technology, applied in wireless communication, electrical components and other directions, can solve the problem of decreased positioning accuracy, not taking into account the different antenna gains, etc., to achieve the change of positioning speed, the reduction of calculation burden, and the suppression of the deterioration of positioning accuracy. Effect

Inactive Publication Date: 2012-08-15
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The above two methods do not take into account the fact that the antenna gain of the terminal is different in the training phase and the positioning phase, so the positioning accuracy is likely to decrease due to the different antenna gain

Method used

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  • Indoor positioning fingerprint grouping method based on signal statistics
  • Indoor positioning fingerprint grouping method based on signal statistics
  • Indoor positioning fingerprint grouping method based on signal statistics

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Embodiment Construction

[0028] Such as figure 1 As shown, the indoor positioning fingerprint grouping method based on signal statistics of the present invention comprises the following steps:

[0029] (1) Select N reference points in the positioning scene. Try not to choose the reference point in a position where people rarely pass by, such as a corner or a position close to the wall. Define m access points in the positioning scene;

[0030] (2) Perform T signal strength sampling at each reference test point, record the signal strength information of each sampling, and record the tth sampling information of the nth reference point as figure 2 Displays the signal strength information of T samples in the nth reference point. If a certain access point cannot be detected in a sampled signal of the reference point, -100dBm is used as the signal strength information of this access point in this signal strength information. signal strength;

[0031] (3) Divide the sampling information of access points ...

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Abstract

The invention provides an indoor positioning fingerprint grouping method based on signal statistics. The method includes selecting N reference points from a positioning scene and acquiring the number ( hereinafter referred to as m) of access points in the positioning scene; performing T signal intensity samplings in the reference points and recording signal intensity information of the access points in each sampling; dividing the signal intensity information of the access points which have same strongest signal intensities in the signal intensity information of the T samplings into a group and recording the number of the signal intensity information of each group; judging whether the number is larger than or equal to a frequency-time threshold value alpha or not, if so, averaging the signal intensity information of the group as a group of fingerprints of the nth reference point, setting m coarse groupings for the fingerprints, selecting the strongest access point in the fingerprints corresponding to the reference points in each coarse grouping, and finally differing the fingerprints. The indoor positioning fingerprint grouping method based on the signal statistics is simple in operation, and the number of fingerprints needed to be compared during positioning is effectively reduced, so that cost is lowered.

Description

technical field [0001] The invention relates to the technical field of communication and wireless network, in particular to an indoor positioning fingerprint grouping method based on signal statistics. Background technique [0002] Location-based service (Location-based service, LBS for short) is a very important application in mobile computing and wireless communication. LBS not only has great application value in business, but also is very important for public safety, transportation and emergency rescue. Well-known positioning systems include GPS in the United States, Beidou in China, Galileo in the European Union, and Glopas in Russia. These positioning systems are very good for outdoor positioning, but indoors these positioning systems lose their usefulness because the weak positioning signal cannot pass through walls. In this context, many indoor positioning systems have been developed, mainly based on infrared, ultrasonic and wireless local area network (WLAN). Sinc...

Claims

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Application Information

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IPC IPC(8): H04W64/00
Inventor 莫益军曹佐王邦刘晔
Owner HUAZHONG UNIV OF SCI & TECH
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