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Sensors 2016, 16(11), 1825; doi:10.3390/s16111825

An Integrated Wireless Wearable Sensor System for Posture Recognition and Indoor Localization

1
Key Laboratory of Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China
2
Department of Rehabilitation, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, China
*
Author to whom correspondence should be addressed.
Academic Editors: Yun Liu, Han-Chieh Chao, Pony Chu and Wendong Xiao
Received: 30 June 2016 / Revised: 22 October 2016 / Accepted: 24 October 2016 / Published: 31 October 2016

Abstract

In order to provide better monitoring for the elderly or patients, we developed an integrated wireless wearable sensor system that can realize posture recognition and indoor localization in real time. Five designed sensor nodes which are respectively fixed on lower limbs and a standard Kalman filter are used to acquire basic attitude data. After the attitude angles of five body segments (two thighs, two shanks and the waist) are obtained, the pitch angles of the left thigh and waist are used to realize posture recognition. Based on all these attitude angles of body segments, we can also calculate the coordinates of six lower limb joints (two hip joints, two knee joints and two ankle joints). Then, a novel relative localization algorithm based on step length is proposed to realize the indoor localization of the user. Several sparsely distributed active Radio Frequency Identification (RFID) tags are used to correct the accumulative error in the relative localization algorithm and a set-membership filter is applied to realize the data fusion. The experimental results verify the effectiveness of the proposed algorithms. View Full-Text
Keywords: indoor localization; posture recognition; wireless sensor system; set-membership filter indoor localization; posture recognition; wireless sensor system; set-membership filter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, J.; Yu, X.; Wang, Y.; Xiao, X. An Integrated Wireless Wearable Sensor System for Posture Recognition and Indoor Localization. Sensors 2016, 16, 1825.

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