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http://dx.doi.org/10.46670/JSST.2020.29.4.237

Relative Position Estimation using Kalman Filter Based on Inertial Sensor Signals Considering Soft Tissue Artifacts of Human Body Segments  

Lee, Chang June (Mechanical Engineering, Hankyong National Unversity)
Lee, Jung Keun (School of ICT, Robotics & Mechanical Engineering, Hankyong National Unversity)
Publication Information
Journal of Sensor Science and Technology / v.29, no.4, 2020 , pp. 237-242 More about this Journal
Abstract
This paper deals with relative position estimation using a Kalman filter (KF) based on inertial sensors that have been widely used in various biomechanics-related outdoor applications. In previous studies, the relative position is determined using relative orientation and predetermined segment-to-joint (S2J) vectors, which are assumed to be constant. However, because body segments are influenced by soft tissue artifacts (STAs), including the deformation and sliding of the skin over the underlying bone structures, they are not constant, resulting in significant errors during relative position estimation. In this study, relative position estimation was performed using a KF, where the S2J vectors were adopted as time-varying states. The joint constraint and the variations of the S2J vectors were used to develop a measurement model of the proposed KF. Accordingly, the covariance matrix corresponding to the variations of the S2J vectors continuously changed within the ranges of the STA-causing flexion angles. The experimental results of the knee flexion tests showed that the proposed KF decreased the estimation errors in the longitudinal and lateral directions by 8.86 and 17.89 mm, respectively, compared with a conventional approach based on the application of constant S2J vectors.
Keywords
Relative position estimation; Kalman filter; Inertial sensor; Soft tissue artifacts; Human body segments;
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Times Cited By KSCI : 7  (Citation Analysis)
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