278 M. Bassetti et al. Fig. 22.3 The Test 1 reference trajectories for the GPS (a) and the IMU (b) calibration Fig. 22.4 The Test 2 (sprints and changes of direction) reference trajectories FW Gyro 2 a b Gyro 3 Gyro1 Gyro 2 UP SW Gyro1 Gyro 3 FW SW UP Fig. 22.5 The IMUs reference system in for the Test 1 and 2, with the IMUs on the back of the athlete (a), and the Test 3, with the IMUs on the rear luggage rack of the bike (b)
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