AP Selection Method Based on WLAN Indoor Positioning

Abstract

The invention provides an AP choosing method based on WLAN indoor positioning, comprising steps of measuring signal intensity of all access points in the position by a user, obtaining a complex vector for describing AP signal characteristics according to the AP signal by the system, eliminating AP candidates which are invalid for positioning according to the characteristics of the complex characteristics, calculating an optimal signal measurement strategy based on a simulation annealing algorithm according to the user-given measurement times, performing measurement on the signal of the access point according to the calculated strategy, uploading the measurement result to the server according, calculating the position of the user by the server according to the signal measurement result and returning the result back to the user. On one hand, the invention effectively eliminates the invalid AP candidate and reduces the complexity, and, on the other hand, the invention provides the optimal strategy based on the simulation annealing algorithm and effectively improves the positioning accuracy under the condition that the measurement times are limited.

Description

technical field [0001] The present invention relates to the technical fields of communication, navigation and positioning, and in particular to an AP selection method based on WLAN indoor positioning. Background technique [0002] Wi-Fi is currently an important part of wireless networks. In homes and public places, more and more Wi-Fi hotspots appear in people's smart devices. Wi-Fi itself does not have a positioning function, but by collecting data such as signal strength and propagation time of each Wi-Fi hotspot in the room, theoretically only three access points are needed, and with the help of a certain algorithm, the user's location can be accurately located . Operators have a wide range of wireless coverage, covering various scenarios such as shopping malls, hospitals, and schools, which provides broad application prospects for wireless indoor positioning. For Wi-Fi precise positioning technology, there are mainly two solutions: one is the hardware solution, that i...

AI Technical Summary

Problems solved by technology

In "Research on AP Selection Strategy in WLAN Fingerprint Positioning" published in "Computer Technology and Development", Cheng Jinjing and others proposed a strategy to assist in selecting APs based on signal strength values ​​and signal strength value variances. However, this method is simply based on signal strength and The variance is sorted in descending order, without considering that the combination of APs in different directions will affect the positioning accuracy

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