一种膝关节角度测量及其校准方法

针对膝关节角度测量问题，给出了一种基于微型加速度传感器测量角度原理的膝关节角度测量方法，该方法结合固定于膝关节同一位置但不同轴向角度的两个微型加速度传感器的测量数据，联合推算出膝关节角度。根据两个传感器输出加速度向量模相等的原理，进一步提出了测量角度的交叉校准方法。实验结果表明，采用该方法建立的膝关节角度测量系统，测量成本较低，测量精度达到±1．5°。

Method of measuring and calibrating the angle of the knee joint

Aiming at the knee joint＇s angle measuring problem, a method of measuring the angle of the knee joint based on the angle measuring principle of micro accelerometer was brought forward. The angle was calculated from each axial acceleration value of two micro accelerometers fixed on the same position but different axial angle. According to the equality principle of the two micro accelerometers＇ accelerations, cross-calibration was put forward to the angle measuring system. The experiments＇ results indicate that the knee joint＇s angle measure system adopting biaxial angle measure technique combined cross-calibration, has merit of low cost, and the measuring precision achieves to ± 1.5°.