Archery Bow Micro-Movement Profiling Using Inertial Measurement Unit

The micro-movement of archery bow is crucial in determining arhcer's shooting performance. The attachment of Inertial Measurement Unit (IMU) on a bow can provide an insight of the hand-to-grid movement during archers perform anchoring and aiming phases. The movement study of using IMU is captured in this paper to further analyze the low and high frequency components. By applying Fast Fourier Transform (FFT) to the IMU signal, several statistical insight can be gained to understand the micro-movement performance in archery, particularly during the aiming phase. Subsequently, a performance profile can be constructed by obtaining the statistical parameters in the FFT analysis of all elite archers. The average FFT frequency components is devised using a normal distribution, with a standard deviation found at 26Hz. In addition, the top-10 occurrence frequencies reveal that 1Hz, 3Hz, 6Hz, and 10Hz are the most significant frequencies exhibited among all archers. A scoring system is demonstrated by implementing the performance profile and a threshold value to inspect the archers' profiles.