'Are You with Me?' - Using Accelerometers to Determine If Two Devices Are Carried by the Same Person

Lester, J. and Hannaford, B. and Borriello, G. (2004) 'Are You with Me?' - Using Accelerometers to Determine If Two Devices Are Carried by the Same Person. In: Proceedings of the Second International Conference on Pervasive Computing.

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Abstract

As the proliferation of pervasive and ubiquitous computing devices continues, users will carry more devices. Without the ability for these devices to unobtrusively interact with one another, the user’s attention will be spent on coordinating, rather than using, these devices. We present a method based on a coherence function, a measure of linear correlation in the frequency domain, to reliably analyze walking data recorded by low-cost MEMS accelerometers to determine if two devices are carried by the same person. We use inexpensive accelerometers and show that these sensors perform similarly to more expensive accelerometers for the frequency range of human motion, 0 to 10Hz. We also present results from a large test group illustrating the algorithm’s robustness and its ability to withstand real world time delays, crucial for wireless technologies like Bluetooth and 802.11. We present results that show that our technique is 100 accurate using a sliding window of 8 seconds of data and the devices are carried in the same location on the body (we also present results for when devices are carried on different parts of the body), is tolerant to inter-device communication latencies, and requires little communication bandwidth.

Item Type: Conference or Workshop Item (Paper)
Subjects: Z Other
Depositing User: Andrew Haddock
Date Deposited: 13 Jul 2015 23:31
Last Modified: 13 Jul 2015 23:31
URI: http://brl.ee.washington.edu/eprints/id/eprint/173

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