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Sensors 2017, 17(9), 2065; https://doi.org/10.3390/s17092065

A UWB/Improved PDR Integration Algorithm Applied to Dynamic Indoor Positioning for Pedestrians

School of Electrical Engineering and Automation, East China Jiaotong University, Nanchang 330013, China
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Received: 10 July 2017 / Revised: 21 August 2017 / Accepted: 5 September 2017 / Published: 8 September 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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Abstract

Inertial sensors are widely used in various applications, such as human motion monitoring and pedestrian positioning. However, inertial sensors cannot accurately define the process of human movement, a limitation that causes data drift in the process of human body positioning, thus seriously affecting positioning accuracy and stability. The traditional pedestrian dead-reckoning algorithm, which is based on a single inertial measurement unit, can suppress the data drift, but fails to accurately calculate the number of walking steps and heading value, thus it cannot meet the application requirements. This study proposes an indoor dynamic positioning method with an error self-correcting function based on the symmetrical characteristics of human motion to obtain the definition basis of human motion process quickly and to solve the abovementioned problems. On the basis of this proposed method, an ultra-wide band (UWB) method is introduced. An unscented Kalman filter is applied to fuse inertial sensors and UWB data, inertial positioning is applied to compensation for the defects of susceptibility to UWB signal obstacles, and UWB positioning is used to overcome the error accumulation of inertial positioning. The above method can improve both the positioning accuracy and the response of the positioning results. Finally, this study designs an indoor positioning test system to test the static and dynamic performances of the proposed indoor positioning method. Results show that the positioning system both has high accuracy and good real-time performance. View Full-Text
Keywords: inertial navigation; UWB; indoor positioning; symmetrical features; error correction inertial navigation; UWB; indoor positioning; symmetrical features; error correction
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Chen, P.; Kuang, Y.; Chen, X. A UWB/Improved PDR Integration Algorithm Applied to Dynamic Indoor Positioning for Pedestrians. Sensors 2017, 17, 2065.

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