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Channel state information-based passive indoor positioning method

A technology of channel status information and indoor positioning, which is applied in location information-based services, wireless communication, wireless communication services, etc., to achieve the effects of reducing costs, simple and effective methods, and improving classification accuracy

Active Publication Date: 2016-08-03
ZHEJIANG UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of positioning algorithms, some scholars have used the probability method, that is, the Bayesian formula to achieve positioning, but its physical quantity is still RSS, and there is room for further improvement.

Method used

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  • Channel state information-based passive indoor positioning method
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  • Channel state information-based passive indoor positioning method

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Embodiment Construction

[0041] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0042] see Figure 1 ~ Figure 4 , the embodiment of the present invention includes:

[0043] 1. If figure 1 As shown, our experimental platform includes two parts: access point AP and monitoring point MP. AP is an ordinary wireless router, and MP is a laptop installed with Intel5300 network card and channel state information extraction software;

[0044] 2. The specific implementation site is a laboratory, which has abundant multipath effects. We divide the room into several grids, and the distance between each grid is about 1.2m, such as figure 2 shown;

[0045] 3. For each collection, the human body stands figure 2 The data collection po...

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Abstract

The invention discloses a channel state information-based passive indoor positioning method. According to the method, ordinary equipment is utilized to build a data acquisition platform. The method specifically includes two stages, namely, an offline training stage and an online testing stage. According to the offline training stage, the channel state information data of each position where the body of a person is located, and the channel state information data are preprocessed, and then the preprocessed channel state information data are stored in a position fingerprint database, and a position-data fingerprint mapping relationship is established. According to the online testing stage, similarly, the data are preprocessed, a naive Bayes algorithm in machine learning is utilized to perform position classification. In order to further improve the accuracy of classification, a confidence method is introduced, and position misjudgment is decreased based on the classification result of a plurality of antenna pairs. With the method adopted, passive positioning of indoor people can be realized with low cost, and classification accuracy can achieve more than 90% under an optimal condition. The method of the invention has a certain application value in fields such as the intrusion detection field and the smart home field.

Description

technical field [0001] The invention relates to the field of indoor positioning, in particular to a passive indoor positioning method based on channel state information. Background technique [0002] Indoor positioning is one of the key technologies to realize location-based services, and it is attracting more and more attention from theoretical research and engineering applications. GPS has been widely used in outdoor environments, but GPS signals cannot pass through thick concrete walls, and the indoor environment is much more complicated than outdoors, so GPS is not suitable for indoor positioning. The current main indoor positioning technologies: infrared, UWB, RFID, and ultrasonic, all have the disadvantages of low cost performance and inability to be widely deployed. With the development of wireless local area network (WLAN), wireless hotspots have been widely distributed in various indoor places, such as schools, hospitals, restaurants, supermarkets, etc. If these ex...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W4/04H04W64/00
Inventor 吴哲夫徐强翔云傅晨波宣琦
Owner ZHEJIANG UNIV OF TECH
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