Abstract
In the scientific research for safe improvement and technical analysis of the rugby, micro sensors begin to be used recently. Then, this paper aims at the development of a system to measure the movement characteristics of the tackles and the side steps using an acceleration and gyro sensor. The acceleration vector to be provided from a sensor has a peculiar local coordinate system. Therefore, the acceleration vector of the local coordinate system is converted to the acceleration vector of the absolute coordinate system by Rotation matrix. The displacement and the velocity are calculated by integrating accelerations of the absolute coordinate system. The impact force is calculated by substituting velocity for the equation relations of momentum and the impulse. This article reports the practical skill experiment that measured the moving trajectories of the side steps. The experimental results clarified the quantitative error and problems in the measurement using the inertial sensors. The results of the step action experiment show that the maximum error of the moving trajectories is 20 %.
