慣性センサを用いた最大速度歩行時の歩行距離推定精度の改善

抄録

This paper describes the validity of the fastest speed gait analysis system using tiptoe-mounted inertial sensor. Recent studies have suggested that the change in walking speed may indicate mild cognitive impairment. Hirosaki University has conducted a survey of 10 m fastest speed walking for local residents. However, the conventional method was a big burden to the staff because they need to measure the walking time with a stopwatch by following subjects. To solve this problem, we have studied the system for calculating the walking speed from top toe-mounted inertial sensor. Further, it may be found the index to find the disease by analyzing the gait parameters of each step. However, it is difficult to analyze the very fast speed walking such as of young people because the acceleration or the angular velocity exceeds the measuring range of the high sensitivity sensor. To solve this problem, the low sensitivity inertial sensors which can measure up to 120 G and 6000 deg/s are used in addition to the high sensitivity sensor which can measure up to 16 G and 2000 deg/s. In addition, integration duration is decided by using the synthetic angular velocity. 135 young subjects participated in the experiments and experimental results showed that the estimation error of walking distance is about - 1.14 ± 6.85 %. It is suggested that the tip-toe mounted inertial sensor can be used for analysis of the gait parameters of the 10 m fastest speed walking.