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A wireless signal fingerprint matching method

A wireless signal, matching method technology, applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problem of low matching accuracy and precision

Active Publication Date: 2016-06-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: how to provide a wireless signal fingerprint matching method to solve the problem of low matching accuracy and precision in the prior art

Method used

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  • A wireless signal fingerprint matching method
  • A wireless signal fingerprint matching method
  • A wireless signal fingerprint matching method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as figure 1 As shown, this embodiment records a wireless signal fingerprint matching method, including the following steps:

[0067] S1, in the fingerprint database Select a fingerprint record F in k ;

[0068] Specifically, an indoor wireless network is usually composed of multiple wireless APs. By surveying the received signal strength of the APs indoors, a fingerprint database for locating the target area can be obtained. . The survey process is as follows: first, select sampling points in a grid-like manner according to a certain density (for example, set a sample every two meters); secondly, record the received signal strength of each AP at each sampling point as the corresponding position of the sampling point The fingerprint of the wireless signal is stored in the fingerprint database. That is to say, each fingerprint in the fingerprint database corresponds to an accurate physical location label.

[0069] Assume that there are N wireless APs in the p...

Embodiment 2

[0107] On the basis of Embodiment 1, the following steps are also included after step S3 and before step S4:

[0108] S3B. Robust reduction is performed on the received signal strength difference of the abnormal common characteristic AP.

[0109] Since the stability of each AP is different, the same sampling point is surveyed at different times, and the sampling fingerprints obtained may be different. In particular, if the stability of some APs is poor, then the survey results of the received signal strength of the AP may appear in two situations: one is that at the same sampling point, the received signal strength of the AP appears relatively high in a short period of time; Large fluctuations, and the other is two adoption points that are located very close to each other, but the received signal strength of the AP surveyed is very different. Both of these situations will have a great impact on the matching results of user fingerprints. Such poorly stable APs are called abnor...

Embodiment 1

[0127] Other steps in embodiment 1 remain unchanged.

[0128] Reducing the received signal strength difference of APs can eliminate the influence of abnormal APs on the matching results and greatly improve the matching accuracy.

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Abstract

The invention discloses a wireless signal fingerprint matching method which comprises the following steps: S1, selecting a fingerprint record Fk in a fingerprint database; S2, determining public representation APs (access point) of a user fingerprint Fu and the Fk; S3, calculating the representation capacity coefficients of the public representation APs; S4, calculating the matching distance of the Fu and the Fk according to the difference of received signal strength of the public representation APs and the representation capacity coefficients; S5, updating k value, repeating the steps till the matching distances from all fingerprint records in the fingerprint database to the user fingerprint Fu; and S6, finding a fingerprint, with minimum matching distance to the user fingerprint Fu and the matching distance from adjacent fingerprints to the use fingerprint Fu meeting a certain threshold value as a target fingerprint of the user fingerprint Fu, wherein a corresponding position is the user position. The method can effectively prevent mistaken match by means of a ring positioning method, so that the matching accuracy is improved. The problem that the fingerprint matching precision is not high caused by instability of the APs is solved by means of a robust rule technology.

Description

technical field [0001] The invention relates to the technical field of wireless indoor positioning, in particular to a wireless signal fingerprint matching method applied to indoor precise positioning. Background technique [0002] The widespread popularity of smartphones and the large-scale promotion of wireless devices have spawned a large number of studies on wireless indoor positioning. Most of the current indoor positioning methods use existing wireless access points (AccessPoints, APs) in the environment (such as access points of wireless technologies such as WiFi, GSM, and ZigBee) to achieve positioning. Due to the easy availability of Received Signal Strength (RSS), it has become the most commonly used physical characteristic. The received signal strength for each AP can usually be read directly from the wireless network device. The method of using wireless signals as location features has become the most widely used indoor positioning method, also known as fingerp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 吴陈沭杨铮刘云浩孙家广毛续飞王继良
Owner TSINGHUA UNIV