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AP choosing method based on WLAN indoor positioning

An indoor positioning and positioning technology, applied in the fields of navigation, positioning and communication

Active Publication Date: 2016-04-27
SHANGHAI JIAO TONG UNIV
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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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  • AP choosing method based on WLAN indoor positioning
  • AP choosing method based on WLAN indoor positioning
  • AP choosing method based on WLAN indoor positioning

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0051] Please also see figure 1 , figure 2 and image 3. In this embodiment, the AP selection strategy based on WLAN indoor positioning is operated through cooperation between the user's smart device and the positioning server. The positioning server establishes a data connection with the client through the WLAN or mobile cellular network. within coverage. When the user requests positioning, it is necessary to measure the signal strength of the AP at the location, and then according to the signal c...

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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...

Claims

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Application Information

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IPC IPC(8): H04W4/00H04W4/02H04W64/00H04W84/12
CPCH04W4/025H04W4/80H04W64/00H04W84/12
Inventor 张哲慧刘多闻吴志豪田晓华王新兵
Owner SHANGHAI JIAO TONG UNIV
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