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CSI-based indoor positioning method

An indoor positioning and positioning method technology, applied in the field of personnel positioning under indoor Wi-Fi, can solve the problems of insufficient stability of RSSI signal, low positioning accuracy, and poor reliability, and achieve strong real-time performance, high accuracy, and guaranteed authenticity Effect

Inactive Publication Date: 2019-01-04
NORTHWEST NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

The RSSI-based indoor positioning method in the prior art has defects such as insufficient stability of the RSSI signal, poor reliability, and low positioning accuracy.

Method used

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] CSI-based fingerprint positioning mainly needs to do the following two points: 1) When the CSI signal is located at a certain point, the signal should be as stable as possible; 2) The CSI signals collected at different points should be easy to distinguish, thereby distinguishing different locations. Due to the interference of several factors in the environment, the original CSI signal has a lot of noise, which will affect the stability and distinguishability of CSI. In order to reduce the interference caused by the indoor environment to the CSI signal, using the phase feature of CSI, the positioning method of the present invention will be based on the amplitude and phase information of CSI, respectively process the amplitude and phase information, and fuse the processed features to improve positioning accuracy. .

[0033] 1. Amplitude p...

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Abstract

The invention provides a CSI-based indoor positioning method. The method comprises: carrying out filtering and linear transformation processing on CSI amplitude and phase data to obtain stable and robust data features; carrying out fusion of the processed amplitude and phase information to perform indoor positioning; applying naive Bayes classification to training and testing of a positioning mode, collecting a signal feature of an unknown position in real time at a linear stage, carrying out data processing to obtain amplitude phase information of the point, carrying out online matching witha fingerprint database based on a naive Bayesian classification algorithm, outputting an optimal result, and completing position estimation of a test point. According to the positioning method, defects of low accuracy and stability of the traditional indoor positioning method are overcome; the multipath interference in an indoor environment is reduced by processing and utilizing the data feature of the CSI effectively; and indoor high-precision passive positioning is realized without the need for the user to carry other devices.

Description

technical field [0001] The invention belongs to the field of wireless perception technology, and relates to a method of using commercial Wi-Fi equipment to extract CSI signals, using the characteristic values ​​of amplitude and phase in CSI for positioning, mainly used to solve indoor personnel positioning and tracking, especially for indoor Wi-Fi The personnel positioning below. Background technique [0002] Location-based applications and services are related to every move in people's lives, and locate target persons or objects in indoor environments, such as intrusion detection, security monitoring, and indoor navigation in real life. Indoor positioning requires real-time, accuracy, and stability. However, in an indoor environment, signal transmission will be limited by multipath interference, shadow effect, power attenuation, transmission delay, etc., resulting in poor positioning service effect. Based on this, positioning methods of wireless signals including Wi-Fi, B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/029H04W4/33H04W64/00H04B7/06
CPCH04B7/0626H04W4/029H04W4/33H04W64/006
Inventor 党小超司雄郝占军黄亚宁
Owner NORTHWEST NORMAL UNIVERSITY
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