Effect of IMU Design on IMU-Derived Stride Metrics for Running

Sensors

LauroV Ojeda¹  StephenM Cain¹  NoelC Perkins¹  MichaelV Potter¹ 

[1] Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;

关键词: wearable sensors;    ZUPT;    sensor requirements;    gait;   

DOI  :  10.3390/s19112601

来源: DOAJ

【 摘 要 】

Researchers employ foot-mounted inertial measurement units (IMUs) to estimate the three-dimensional trajectory of the feet as well as a rich array of gait parameters. However, the accuracy of those estimates depends critically on the limitations of the accelerometers and angular velocity gyros embedded in the IMU design. In this study, we reveal the effects of accelerometer range, gyro range, and sampling frequency on gait parameters (e.g., distance traveled, stride length, and stride angle) estimated using the zero-velocity update (ZUPT) method. The novelty and contribution of this work are that it: (1) quantifies these effects at mean speeds commensurate with competitive distance running (up to 6.4 m/s); (2) identifies the root causes of inaccurate foot trajectory estimates obtained from the ZUPT method; and (3) offers important engineering recommendations for selecting accurate IMUs for studying human running. The results demonstrate that the accuracy of the estimated gait parameters generally degrades with increased mean running speed and with decreased accelerometer range, gyro range, and sampling frequency. In particular, the saturation of the accelerometer and/or gyro induced during running for some IMU designs may render those designs highly inaccurate for estimating gait parameters.

【 授权许可】

Unknown