Heading Estimation for Indoor Pedestrian Navigation Using a Smartphone in the Pocket

Sensors

Zhi-An Deng¹  Guofeng Wang²  Ying Hu²  Di Wu² 

[1] School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China;

关键词: indoor navigation;    heading estimation;    rotation matrix;    principal component analysis;    smartphone sensors;   

DOI  :  10.3390/s150921518

来源: mdpi

【 摘 要 】

Heading estimation is a central problem for indoor pedestrian navigation using the pervasively available smartphone. For smartphones placed in a pocket, one of the most popular device positions, the essential challenges in heading estimation are the changing device coordinate system and the severe indoor magnetic perturbations. To address these challenges, we propose a novel heading estimation approach based on a rotation matrix and principal component analysis (PCA). Firstly, through a related rotation matrix, we project the acceleration signals into a reference coordinate system (RCS), where a more accurate estimation of the horizontal plane of the acceleration signal is obtained. Then, we utilize PCA over the horizontal plane of acceleration signals for local walking direction extraction. Finally, in order to translate the local walking direction into the global one, we develop a calibration process without requiring noisy compass readings. Besides, a turn detection algorithm is proposed to improve the heading estimation accuracy. Experimental results show that our approach outperforms the traditional uDirect and PCA-based approaches in terms of accuracy and feasibility.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.