Cosine similarity based RSS (Received Signal Strength) detection difference compensation method

A technology of cosine similarity and difference compensation, which is applied in the field of indoor positioning in the field of wireless communication networks, can solve the problems of decreased positioning accuracy and decreased positioning stability, and achieve the goal of improving positioning accuracy, reducing average positioning error, and improving positioning stability Effect

Active Publication Date: 2017-05-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that mobile devices of different brands and models have different detection capabilities for Wi-Fi signal reception strength, resulting in decreased positioning accuracy and decreased positioning stability.

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  • Cosine similarity based RSS (Received Signal Strength) detection difference compensation method
  • Cosine similarity based RSS (Received Signal Strength) detection difference compensation method
  • Cosine similarity based RSS (Received Signal Strength) detection difference compensation method

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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The positioning system of the compensation and correction method based on the cosine similarity of the present invention is divided into three stages: an offline training stage, an online correction stage and an online positioning stage. In the offline training phase, the offline training equipment is used to select suitable reference points in the area to be positioned to construct the original fingerprint database; Mark it with appropriate signs (the specific position and number can be reasonably selected according to the layout of the indoor environment), and then use the online positioning device to obtain the received signal from each AP (wireless access point) on the reference point closest to the user among the marked reference points Intensity vector set, and finally use the compensation and correction strategy based on cosine similarity to com...

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Abstract

The invention discloses a cosine similarity based RSS (Received Signal Strength) detection difference compensation method. According to the method, the cosine similarity is introduced to act as a measurement criterion for judging whether RSS indoor positioning accuracy difference compensation can be performed or not between different equipment, and the difference of RSS detection positioning accuracy is compensated through a method of ratio correction for an equipment group meeting the measurement criterion, so that a problem of reduction in accuracy and stability brought about by the difference in RSS detection capabilities of different equipment is effectively solved. In addition, the effectiveness and the reliability of the method are verified by a system through Android platform software design. Experimental results show that the method disclosed by the invention effectively improves the positioning accuracy and the positioning stability.

Description

technical field [0001] The invention relates to indoor positioning technology in the field of wireless communication networks, in particular to a method for compensating differences in received signal strength RSS measurement based on cosine similarity. Background technique [0002] In recent years, with the development of wireless networks and the widespread application of ubiquitous computing technology, many public and commercial services, including search and rescue, fire rescue, and location-based services, have gradually increased the demand for location information of mobile users. The outdoor positioning system based on satellite signals is very mature, but there is still a lack of relatively mature and widely used indoor positioning system. Therefore, the research on indoor positioning technology has very important practical significance. With the rapid development of Wi-Fi technology and mobile device wireless network receivers, wireless network coverage has becom...

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Application Information

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IPC IPC(8): H04W64/00G01S11/06G01S5/02H04W24/02
CPCG01S5/0252G01S11/06H04W24/02H04W64/00
Inventor 王磊周亮李中雷陈鸣楷柳思然周慧
Owner NANJING UNIV OF POSTS & TELECOMM
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