title: Estimation of spatial-temporal gait parameters using a low-cost ultrasonic motion analysis system.
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.
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. qiyo0001@e.ntu.edu.sg.
authors.forename: Yongbin
authors.initials: Y
authors.lastname: Qi
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. ecbsoh@ntu.edu.sg.
authors.forename: Cheong Boon
authors.initials: CB
authors.lastname: Soh
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. egunawan@ntu.edu.sg.
authors.forename: Erry
authors.initials: E
authors.lastname: Gunawan
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. ekslow@ntu.edu.sg.
authors.forename: Kay-Soon
authors.initials: KS
authors.lastname: Low
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. rijil001@e.ntu.edu.sg.
authors.forename: Rijil
authors.initials: R
authors.lastname: Thomas
mesh_terms: D001696:Biomechanical Phenomena; D005684:Gait / Q000502:physiology*; D006801:Humans; D014465:Ultrasonics