Real-Time Ski Jumping Trajectory Reconstruction and Motion Analysis Using the Integration of UWB and IMU

Abstract

AbstractTo satisfy an increasing demand to reconstruct an athlete's motion for performance analysis, this paper proposes a new method for reconstructing the position, acceleration, velocity and angle of skis in the context of ski jumping trajectories. Therefore, a real-time Measurement System was used. The system consisted of wearable devices attached to the athletes and fixed ultra-wide band (UWB) antennas next to the jumping hill. To determine the accuracy and precision of the method, six athletes of the China A or B National Team performed 25 measured ski jumps. The method was used to measure the trajectory, velocity, acceleration and skis angles during the jump. The measurements are compared with camera measurements of a Markerless Human Movement Automatic Capture System to assess their accuracy. The test results demonstrate that the method has sufficient accuracy and reliability for ski jumping. Thus, the system can be used as a tracking system during training and competitions for coaches and sports scientists.KeywordsSki jumpingTrackingTrajectoryUltra-wideband (UWB)Inertial measurement unit (IMU)Wearable sensors