Orient-2: a realtime wireless posture tracking system using local orientation estimation

A. D. Young, M. J. Ling, D. K. Arvind

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A realtime posture tracking system has been developed using a network of compact wireless sensor devices worn by the user. Each device is a complete inertial/magnetic tracking unit which performs in situ orientation estimation based on its own sensor readings, using a complementary quaternion-based filter. Compared to existing systems which transmit raw sensor data to a PC for processing, it is shown that this technique reduces bandwidth requirements by 79% for typical usage. In combination with a time division multiple access scheme, this reduction allows for full-body tracking using 15 devices at a 64Hz update rate through a single 250kbps receiver. The data is applied to a rigid body model of the subject to provide a realtime display, and can be exported for use in major animation packages.
Original languageEnglish
Title of host publicationEmNets '07 Proceedings of the 4th workshop on Embedded networked sensors
Place of PublicationNew York, NY, USA
Number of pages5
ISBN (Print)978-1-59593-694-3
Publication statusPublished - 2007


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