Skaloud, JanLimpach, Philippe2005-11-172005-11-172005-11-172003https://infoscience.epfl.ch/handle/20.500.14299/220100This paper presents the conceptual and technical aspects of a system in development that precisely determines athlete's trajectory through a course. Carrier phase-based (CP-DGPS) positioning represents core of the system, while tri-acial accelerometer and magnetic sensors act as an autonomous aid that offers instantaneous attitude determination and can potentially help when navigating through GPS signal blackout zones.gpsskigpsskitrajectorytopotrajtext::conference output::conference proceedings::conference paper