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WiFi fingerprint-based accuracy improved indoor positioning method

An indoor positioning and fingerprint technology, applied in electrical components, wireless communication, etc., can solve the problems of inaccurate fingerprint database, unsatisfactory positioning accuracy, unsatisfactory matching accuracy, etc., and achieve the effect of accurate positioning coordinates and accurate fingerprint database

Inactive Publication Date: 2016-09-07
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] However, the existing WiFi fingerprint positioning method still has the following problems: first, in the sampling stage, each sampling point needs to collect and preprocess the signal, and the existing single-direction collection and mean value filtering processing methods are not ideal enough, resulting in The fingerprint database is not accurate enough, which makes the positioning accuracy not ideal in the later stage; second, in the positioning stage, some matching methods such as KNN have given the same weight to K neighboring reference points, resulting in unsatisfactory matching accuracy

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Embodiment Construction

[0028] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, the present invention is divided into a sampling phase and a positioning phase.

[0030] In the sampling stage, a certain number of sampling points are pre-arranged according to the grid in the area to be located, and the mobile device is used to collect the received WiFi signal strength from different AP hotspots at each sampling point, and store them in the database together with the physical location of the sampling point , and finally establish a fingerprint database of WiFi signal strength and physical location mapping. Assuming that in the sampling stage, a total of m sampling points of WiFi fingerprints are collected, denoted as {F 1 , F 2 ,...,F m},F i =(rss i1 ,rss i2 ...,rss ij ...rss in ), where F i Indicates the fingerprint of the i-th sampling point, rss ij Indicates the signal strength of the j-th AP hotspot ...

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Abstract

The invention discloses a WiFi fingerprint-based accuracy improved indoor positioning method. The method includes a sampling stage and a positioning stage. In the sampling phase, Collection and Gauss filter at different directions are combined, so that an FODG (fusion of different direction collection and gauss Filter) sampling method is designed; WiFi signals are collected in different directions (east, south, west and north); some signals of which the signal intensity larges deviates from a signal intensity mean value are filtered out through Gauss filter; and average filtering is performed on the signals, and the filtered signals are stored into a fingerprint database. In the positioning phase, an AWKNN matching method is designed, namely, when Euclidean distances are calculated, different weights are assigned to access points (AP) with different signal intensities; and in a coordinate matching link, different weights are assigned to K neighbor sampling points according to the lengths of the Euclidean distances. Compared with a traditional WiFi fingerprint positioning method, the positioning method of the invention according to which FODG sampling and AWKNN matching are combined can improve positioning accuracy.

Description

technical field [0001] The invention relates to an indoor positioning method with improved accuracy based on WiFi fingerprints, and belongs to the technical field of indoor positioning. Background technique [0002] With the rapid development of information technology, terminal-based indoor positioning technology can provide users with information retrieval services, indoor navigation services, community dating services, etc., so it has become a current hot research field. The existing WiFi fingerprint positioning method has a wide positioning range, low cost, flexible use, and no need for additional hardware support, so it has become a research hotspot. [0003] However, the existing WiFi fingerprint positioning method still has the following problems: first, in the sampling stage, each sampling point needs to collect and preprocess the signal, and the existing single-direction collection and mean value filtering processing methods are not ideal enough, resulting in The fi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
CPCH04W64/006
Inventor 蔡敏敏王玉峰
Owner NANJING UNIV OF POSTS & TELECOMM
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