期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 27, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/27/1/015702
关键词
pedestrian dead-reckoning; extended Kalman filter; zero velocity update; heel strike phase; toe-off phase
资金
- ICT R&D program of MSIP/IITP (Development of ODM-Interactive Software Technology Supporting Live-Virtual Soldier Exercises) [R0101-15-0168]
In this paper, we propose an advanced pedestrian dead-reckoning (PDR) algorithm that considers the heel-strike and toe-off phases. Generally, PDR systems that use a foot-mounted inertial measurement unit are based on an inertial navigation system with an extended Kalman filter (EKF). To reduce the influence of the bias and white noises in the gyroscope and accelerometer signals, a zero-velocity update is often adopted at the stance phase. However, transient and large acceleration, which cannot be measured by the accelerometer used in pedestrian navigation, occur momentarily in the heel-strike phase. The velocity information from integration of the acceleration is not reliable because the acceleration is not measured in the heel-strike phase. Therefore, the designed EKF does not correctly reflect the actual environment, because conventional algorithms do not take the non-measurable acceleration into consideration. In order to reflect the actual environment, we propose a PDR system that considers the non-measurable acceleration from the heel-strike impact. To improve the PDR system's performance, the proposed algorithm uses a new velocity measurement obtained using the constraint between the surface and the foot during the toe-off phase. The experimental results show improved filter performance after comparison of the proposed algorithm and a conventional algorithm.
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