Did you see Bob?: human localization using mobile phones
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Directional antenna diversity for mobile devices: characterizations and solutions
Proceedings of the sixteenth annual international conference on Mobile computing and networking
EURASIP Journal on Wireless Communications and Networking - Special issue on towards the connected body: advances in body communications
A survey on smartphone-based systems for opportunistic user context recognition
ACM Computing Surveys (CSUR)
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We present a method to infer the orientation of mobile device carried in a pocket from the acceleration signal acquired when the user is walking. Whereas previous work has shown how to determine the the orientation in the vertical plane (angle towards earth gravity), we demonstrate how to compute the orientation within the horizontal plane. To validate our method we compare the output of our method with GPS heading information when walking in a straight line. On a total of 16 different orientations and traces we have a mean difference of 5 degrees with 2.5 degrees standard deviation.