Latt W T, Tan U-X, Riviere C N, Ang W T
Department of Computing, and the Hamlyn Center for Robotic Surgery, Imperial College London (phone:+44 0 7542163363).
IEEE Sens J. 2012 May;12(5):1207-1208. doi: 10.1109/JSEN.2011.2165057.
Gyroscope-free inertial measurement units have been gaining popularity in applications such as motion sensing of hand-held microsurgical instruments. Various accelerometer placement configurations have been proposed in the past. However, the effect of non-identical transfer functions of accelerometers on the accuracy of angular motion sensing has been underestimated and never been taken into consideration. In this paper, significant effect of different phases at different accelerometer outputs due to non-identical transfer functions on the accuracy is highlighted, and a method is proposed to make the transfer functions of all the accelerometers identical. Effectiveness of the method is confirmed with an experiment using ADXL-203 accelerometers.
无陀螺惯性测量单元在诸如手持式显微外科器械运动传感等应用中越来越受欢迎。过去已经提出了各种加速度计放置配置。然而，加速度计传递函数不一致对角运动传感精度的影响一直被低估，且从未被考虑在内。本文强调了由于传递函数不一致导致不同加速度计输出处不同相位对精度的显著影响，并提出了一种使所有加速度计传递函数相同的方法。使用ADXL - 203加速度计进行的实验证实了该方法的有效性。
