Design and Implementation of Ski Jumper's Motion Monitor System by Terrestrial Magnetism and Acceleration Sensors

We have confirmed that terrestrial magnetism and acceleration sensors are useful to measure ski jumper's in run descending speed and taking-off positions using a model of ski jumping ramp. Also, we gathered required measurement by inquiring a ski jumping athlete and his coach. As this result, we confirmed following measurement: in run descending speed, jumper's style and posture at jumping point, and slant of body of the jumper when he is flying. We are developing a ski jumper's motion monitoring system using terrestrial magnetism, acceleration sensors, and video camera which enable to monitor such measurements. In this paper, we describe its design and implementation.