共有六个函数。作用分别是，姿态矩阵转换为欧拉角；欧拉角转换为姿态矩阵；欧拉角转换为四元数；四元数转换为姿态矩阵‘四元数转换为欧拉角。’(There are six functions. The effect is that the attitude matrix is transformed to the Euler angle, the Euler angle is transformed into the attitude matrix, the Euler angle is convert