一种新的羽毛球拍挥拍轨迹识别方法

A Novel Swing Trajectory Recognition Method for Badminton Racket

为了更加精确地识别羽毛球拍的运动轨迹,提出一种多传感器融合的挥拍轨迹识别方法(TRM,trajectory recognition method).使用放置在球拍拍柄底部的智能设备进行数据采集,该设备由加速度计、陀螺仪和磁力计的多传感器组成.首先,使用加速度计和磁力计对陀螺仪进行修正,改进基于卡尔曼滤波器的四元数姿态解算精度并得到姿态角.其次,使用旋转矩阵去除加速度的重力分量,再对加速度数据进行频域数值积分得到速度和位移,采用最小二乘拟合多项式剔除数值积分过程中产生的累积误差.最后,结合姿态角、速度和位移,识别出挥拍轨迹.实验结果表明,提出的TRM具有良好的有效性.与传统时域积分轨迹识别方法相比,TRM的挥拍轨迹识别率更高.TRM可以更准确地进行羽毛球拍运动轨迹识别.

A novel trajectory recognition method（ TRM） using multi-sensor fusion was proposed to extract the motion trajectory of badminton racket more accurately. The smart device was placed in the bottom of the handle of the racket,which was composed of accelerometer,magnetometer and gyroscope. Firstly,the date of gyroscope was optimized by accelerometer and magnetometer.By combining gyroscope error,the attitude angle of trajectory could be obtained using TRM.Then the speed and the displacement were calculated by frequency domain integral of acceleration data. The accumulated error of frequency domain integral is removed by the least squares fitting method. Finally,the trajectory was identified by attitude angle,the speed and the displacement.Multiple experimental results showthat the validity of TRMis great. Compared with the traditional time domain integral trajectory recognition method,the identification accuracy of TRMis higher. TRMcan recognize the trajectory of badminton racket more accurately.