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Indoor positioning method based on AP selection

A positioning method, an indoor positioning technology, applied in the field of pattern recognition, can solve problems such as not considering AP correlation, not considering AP selection, etc.

Active Publication Date: 2016-04-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The traditional AP selection method only considers the contribution of a single AP to positioning. It regards an AP as independent and irrelevant to other APs, and does not consider the correlation between APs. Studies have shown that there is a certain correlation between different APs. , and the traditional AP selection method usually only selects the AP when establishing the fingerprint database, and does not consider the AP selection during the online positioning

Method used

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  • Indoor positioning method based on AP selection
  • Indoor positioning method based on AP selection
  • Indoor positioning method based on AP selection

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Experimental program
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Embodiment Construction

[0027] The process of a positioning method based on AP selection in indoor positioning described in this specific embodiment is as follows. This solution uses WiFi as a wireless signal positioning as the implementation mode. This solution is also applicable to wireless information modules including Bluetooth, Zibgee, and FM. Positioning includes, but is not limited to, these information modules.

[0028] Step 1: Data collection, set n squares in the area to be positioned according to the size of 1m×1m, collect 600 AP signal values ​​at the center height of each square at a height of 1.2 meters, and collect data in the four directions of east, west, south and north respectively Each sample is collected 150 times, and the sampling interval is 1 time per second. Count the data in the area to be located, and find out the maximum number k of APs that ensure that more than 75% of the reference points can receive signals. Determine the number d of APs to be used for positioning, k>d...

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Abstract

The invention discloses an indoor positioning method based on AP selection. According to the method, a support vector machine criterion function is taken as a discrimination criterion, AP (Access Point) selection is carried out during establishment of a fingerprint database, and a position coordinate is calculated by utilizing Bayes probability weight during online positioning. During establishment of the fingerprint database, the support vector machine criterion function is utilized to calculate a hyperplane distance, and a set of AP having the strongest discrimination capability is selected as an AP selection result during fingerprint database establishment. During online positioning, rough signal processing is carried out before positioning, the Bayes weight positioning algorithm is utilized during positioning, the Bayes probability is taken as weight to carry out weighted average for a target coordinate, and the target position coordinate is acquired. Through the method, reduction of calculation complexity in a positioning process is facilitated, useless APs for positioning are removed, and positioning precision is improved.

Description

technical field [0001] The invention relates to an indoor wireless positioning AP (AccessPoint) selection and positioning method in the field of pattern recognition, in particular to an AP-based selection and positioning method applied to indoor positioning. Background technique [0002] Location fingerprint positioning technology has great prospects as indoor positioning. It can use existing wireless signal frameworks, such as WiFi and FM, and can also properly deploy a certain number of wireless signal transmission modules, such as Bluetooth and Zibgee modules for positioning. However, with the continuous development of society, the number of wireless signal modules deployed indoors is increasing. Usually, more than a dozen to dozens of APs can be received. However, too many APs will bring great harm to the positioning process. Therefore, selecting a group of useful APs from many APs can not only improve the positioning accuracy but also reduce the computational complexity...

Claims

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Application Information

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IPC IPC(8): H04W64/00H04W4/04H04W4/02
Inventor 张梅申文波朱金辉姚志峰
Owner SOUTH CHINA UNIV OF TECH
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