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Sensors 2014, 14(8), 15434-15457; doi:10.3390/s140815434

Estimation of Spatial-Temporal Gait Parameters Using a Low-Cost Ultrasonic Motion Analysis System

School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Received: 28 May 2014 / Revised: 14 August 2014 / Accepted: 15 August 2014 / Published: 20 August 2014
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a low-cost motion analysis system using a wireless ultrasonic sensor network is proposed and investigated. A methodology has been developed to extract spatial-temporal gait parameters including stride length, stride duration, stride velocity, stride cadence, and stride symmetry from 3D foot displacements estimated by the combination of spherical positioning technique and unscented Kalman filter. The performance of this system is validated against a camera-based system in the laboratory with 10 healthy volunteers. Numerical results show the feasibility of the proposed system with average error of 2.7% for all the estimated gait parameters. The influence of walking speed on the measurement accuracy of proposed system is also evaluated. Statistical analysis demonstrates its capability of being used as a gait assessment tool for some medical applications. View Full-Text
Keywords: ultrasonic sensor; gait analysis; walking assessment; gait kinematics; wireless sensor network ultrasonic sensor; gait analysis; walking assessment; gait kinematics; wireless sensor network
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Qi, Y.; Soh, C.B.; Gunawan, E.; Low, K.-S.; Thomas, R. Estimation of Spatial-Temporal Gait Parameters Using a Low-Cost Ultrasonic Motion Analysis System. Sensors 2014, 14, 15434-15457.

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