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A Feedback Mechanism Based Indoor Positioning Method of Dynamic Fingerprint Database

A feedback mechanism and indoor positioning technology, applied in positioning, measuring devices, instruments, etc., can solve the problem of low positioning accuracy, achieve real-time performance, optimize positioning results, and maintain real-time performance

Active Publication Date: 2017-11-03
HUNAN UNIV
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Problems solved by technology

[0005] Aiming at the problem of low positioning accuracy in the prior art, the present invention proposes a dynamic fingerprint library indoor positioning method based on a feedback mechanism, and improves the positioning accuracy by updating the offline RSS database in real time

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  • A Feedback Mechanism Based Indoor Positioning Method of Dynamic Fingerprint Database
  • A Feedback Mechanism Based Indoor Positioning Method of Dynamic Fingerprint Database
  • A Feedback Mechanism Based Indoor Positioning Method of Dynamic Fingerprint Database

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0054] First define the number of anchor nodes L, the anchor node communication radius r, the maximum number of fingerprint library updates G, the current number of fingerprint library updates g, and the positioning error threshold T. The average error of traditional fingerprint library positioning is 0.5m, so set T= 0.5m.

[0055] Such as figure 1 Shown is the flowchart of the positioning method of the present invention. Positioning is divided into offline phase and online phase. In the offline stage, the RSS fingerprint library and the distance matrix between the grids are generated to obtain the anchor node coordinates and grid coordinates; in the online stage, the measurement matrix is ​​generated for the nodes to be positioned, and the KNN algorithm is used for positioning. The second update gets the best positioning result.

[0056] (1) Establ...

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Abstract

The invention discloses a dynamic fingerprint database indoor positioning method based on a feedback mechanism. The dynamic fingerprint database indoor positioning method adopts a fingerprint database dynamic updating mechanism on the basis of a traditional fingerprint database positioning method, adds a distance matrix between grids at the off-line stage, defines an ''updating point'', an ''non-updating point'' and a cut-off region at the on-line stage, calculating an RSS value of the ''non-updating point'' by utilizing a linear interpolation method through spatial correlation so that the RSS value of the position is updated, achieves feedback of the RSS values from the ''updating point'' to the ''non-updating point'', performs positioning and saves the RSS value with the best positioning effect to an off-line database, reduces the cost and complexity of updating while effectively adjusting the fingerprint database, maintains the real-time performance of the fingerprint database, and lays a good foundation for the next positioning.

Description

technical field [0001] The invention belongs to the field of wireless sensor positioning, in particular to a feedback mechanism-based indoor positioning method of a dynamic fingerprint library. Background technique [0002] At present, the advanced satellite positioning system GPS has been widely used in various fields of economy, military, production and life. Therefore, GPS can almost meet all the needs of people for outdoor positioning. With the popularity of smart mobile terminals, people's demand for indoor positioning is increasing day by day. High-precision, low-complexity indoor positioning technology has become a hot spot and focus of research at home and abroad. [0003] Indoor positioning technology is mainly divided into: positioning technology based on special equipment, positioning technology based on Wi-Fi signal ranging, and positioning technology based on location fingerprint. Among them, the positioning technology based on special equipment has the advant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
CPCG01S5/0252
Inventor 罗娟杨倩刘宇姚祥菊聂嘉威
Owner HUNAN UNIV
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