WiFi indoor positioning method based on selection of multiple access points
An access point selection and indoor positioning technology, applied in the field of communication, can solve the problems of increasing the dimension of the fingerprint database, unstable signals, and reducing positioning accuracy, etc., to achieve the effect of reducing dimensionality, reducing complexity, and improving positioning accuracy
Active Publication Date: 2018-09-21
XIDIAN UNIV
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Problems solved by technology
However, some of these access points are far away from the positioning environment and there are some unsatisfactory access points, whose signals are unstable, fluctuate greatly, and carry relatively large noise, which hardly provide valuable information for positioning, and even have May reduce positioning accuracy
In addition, when using all access points, this will greatly increase the dimension of the fingerprint library, increasing the positioning complexity
Method used
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[0028] refer to figure 1 , the implementation steps of the present invention are as follows:
[0029] Step 1, build the access point signal strength database.
[0030] Such as figure 2 , the positioning scene of this example is the corridor of Zone I on the 4th floor of the main building of Xidian University, with an area of 340m 2 ;
[0031] This step is to first divide the positioning environment into 177 square grids with a side length of 0.8m, represent the position of the grid with the position of the center point of the grid, and number each position, and use G j Indicates the jth location; then collect data for each location, record the RSSI value of the signal strength of each access point detected at each location, and form an RSSI database that records the sampling data of each location.
[0032] Step 2, access point selection.
[0033] When selecting an access point in this step, it is divided into the following two steps:
[0034] 2a) This method initially...
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The invention discloses a WiFi indoor positioning method based on the selection of multiple access points, mainly solving the problem that in the prior art, a positioning result is inaccurate. The technical scheme of the method comprises the steps of 1, collecting access point data; 2, according to the access point data, selecting multiple access points, and selecting access point sets with stablesignals and strong resolution capability to form a position fingerprint database; 3, grouping positions according to the fingerprint of each position; 4, reselecting the access point for each position sub-group, and selecting the access point set which can better express features of the position sub-group; 5, building a decision tree model for each position sub-group; 6, giving a positioning sample and determining the position sub-group where the target position of the positioning sample is located; and 7, determining the specific position of the positioning sample by using a positioning model of the position sub-group where the positioning sample is located. According to the method provided by the invention, the influence on positioning accuracy caused by unstable access point in the environment can be effectively overcome, and the method can be applied to various complex positioning environments.
Description
technical field [0001] The invention relates to the technical field of communication, and in particular to a WiFi indoor positioning method, which can be used for location-based services such as positioning and navigation for indoor users. Background technique [0002] With the vigorous development of mobile communication technology and mobile Internet technology, mobile smart terminals have emerged and spread rapidly, and various services based on mobile Internet have shown explosive growth. Among them, the location-based service (LBS) has also experienced rapid development in the past ten years, and has been widely used in people's lives, which has greatly changed people's lifestyles and brought convenience to people's lives. The positioning technology is an essential underlying support technology in LBS applications. In the outdoor environment, the Global Positioning System (GPS) is currently the most mature positioning system. But indoors, due to the wall barrier, the ...
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Login to View More IPC IPC(8): H04W64/00H04W4/33H04W4/024H04W4/029H04W84/12
CPCH04W4/02H04W84/12
Inventor 黄鹏宇赵豪杰刘伟盛敏
Owner XIDIAN UNIV