DGPS-Calibrated Accelerometric System for Dynamic Sports Events

Jan Skaloud and Bertrand Merminod

Abstract:	This paper presents a concept of a system in development that precisely tracks total acceleration of a racer during training or competition in dynamic sports events such as downhill skiing. The envisioned light, small and ergonomic system comprises a micro-strip antenna, GPS on chip receiver and a miniature tri-axial accelerometer (TA) synchronized with GPS data on a flash-card size data logger. The content of the paper focuses on the algorithmic aspects when calibrating the accelerometer signal with DGPS data over a period of a few seconds. The calibration is performed with respect to the magnitude of the acceleration vector induced by a motion of periodic character using sub-optimal but observable error models that describe combined behavior of all TA channels. Simulations and first series of testing indicate that using such calibration, the performance of miniature TA system improves by a factor of 5 to the level of a few milli-g.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	1517 - 1524
Cite this article:	Skaloud, Jan, Merminod, Bertrand, "DGPS-Calibrated Accelerometric System for Dynamic Sports Events," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 1517-1524.
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