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Pedestrian Walking Distance Estimation Based on Smartphone Mode Recognition

1
School of Information and Communication Engineering, Beijing University of Posts and Telecommunication, Beijing 100876, China
2
Beijing Key Laboratory of Mobile Computing and Pervasive Device, Institute of Computing Technology Chinese Academy of Sciences, Beijing 100190, China
3
School of Software Engineering, Beijing University of Posts and Telecommunication, Beijing 100876, China
4
School of Computer Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(9), 1140; https://doi.org/10.3390/rs11091140
Received: 17 April 2019 / Revised: 3 May 2019 / Accepted: 11 May 2019 / Published: 13 May 2019
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Abstract

Stride length and walking distance estimation are becoming a key aspect of many applications. One of the methods of enhancing the accuracy of pedestrian dead reckoning is to accurately estimate the stride length of pedestrians. Existing stride length estimation (SLE) algorithms present good performance in the cases of walking at normal speed and the fixed smartphone mode (handheld). The mode represents a specific state of the carried smartphone. The error of existing SLE algorithms increases in complex scenes with many mode changes. Considering that stride length estimation is very sensitive to smartphone modes, this paper focused on combining smartphone mode recognition and stride length estimation to provide an accurate walking distance estimation. We combined multiple classification models to recognize five smartphone modes (calling, handheld, pocket, armband, swing). In addition to using a combination of time-domain and frequency-domain features of smartphone built-in accelerometers and gyroscopes during the stride interval, we constructed higher-order features based on the acknowledged studies (Kim, Scarlett, and Weinberg) to model stride length using the regression model of machine learning. In the offline phase, we trained the corresponding stride length estimation model for each mode. In the online prediction stage, we called the corresponding stride length estimation model according to the smartphone mode of a pedestrian. To train and evaluate the performance of our SLE, a dataset with smartphone mode, actual stride length, and total walking distance were collected. We conducted extensive and elaborate experiments to verify the performance of the proposed algorithm and compare it with the state-of-the-art SLE algorithms. Experimental results demonstrated that the proposed walking distance estimation method achieved significant accuracy improvement over existing individual approaches when a pedestrian was walking in both indoor and outdoor complex environments with multiple mode changes. View Full-Text
Keywords: indoor positioning; machine learning; pedestrian dead reckoning; stride length estimation; smartphone mode recognition indoor positioning; machine learning; pedestrian dead reckoning; stride length estimation; smartphone mode recognition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, Q.; Ye, L.; Luo, H.; Men, A.; Zhao, F.; Ou, C. Pedestrian Walking Distance Estimation Based on Smartphone Mode Recognition. Remote Sens. 2019, 11, 1140.

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