title: Carrying Position Independent User Heading Estimation for Indoor Pedestrian Navigation with Smartphones.
abstract: This paper proposes a novel heading estimation approach for indoor pedestrian navigation using the built-in inertial sensors on a smartphone. Unlike previous approaches constraining the carrying position of a smartphone on the user's body, our approach gives the user a larger freedom by implementing automatic recognition of the device carrying position and subsequent selection of an optimal strategy for heading estimation. We firstly predetermine the motion state by a decision tree using an accelerometer and a barometer. Then, to enable accurate and computational lightweight carrying position recognition, we combine a position classifier with a novel position transition detection algorithm, which may also be used to avoid the confusion between position transition and user turn during pedestrian walking. For a device placed in the trouser pockets or held in a swinging hand, the heading estimation is achieved by deploying a principal component analysis (PCA)-based approach. For a device held in the hand or against the ear during a phone call, user heading is directly estimated by adding the yaw angle of the device to the related heading offset. Experimental results show that our approach can automatically detect carrying positions with high accuracy, and outperforms previous heading estimation approaches in terms of accuracy and applicability.
authors.affiliation: School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China. dengzhian@dlmu.edu.cn.
authors.forename: Zhi-An
authors.initials: ZA
authors.lastname: Deng
authors.affiliation: School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China. gfwangsh@163.com.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Wang
authors.affiliation: School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China. huying@dlmu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Hu
authors.affiliation: School of computer science and technology, Harbin Institute of Technology, Harbin 150001, China. ycui@hit.edu.cn.
authors.forename: Yang
authors.initials: Y
authors.lastname: Cui
keywords: carrying position; heading estimation; inertial sensors; principal component analysis