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Which Way Am I Facing: Inferring Horizontal Device Orientation from an Accelerometer Signal

Kai Kunze; Paul Lukowicz; Kurt Partridge; Bo Begole
In: Proceedings of the 2009 International Symposium on Wearable Computers. IEEE International Symposium on Wearable Computers (ISWC-2009), 13th, September 4-7, Linz, Austria, Pages 149-150, ISBN 978-0-7695-3779-5, IEEE Computer Society, 2009.


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.

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