基于改进CORDIC算法的光电编码器正交性误差测量

通过对小型光电编码器输出的光电信号精度误差来源进行研究,得出了正交性偏差是其主要误差来源的结论。针对光电编码器输出信号正交性误差的测量,引入了一种改进的坐标旋转数字计算机算法。该算法是在传统坐标旋转数字计算算法的基础上,通过改进其迭代结构得到的,能够很好地实现对光电编码器输出信号的正交性误差进行动态实时测量。MATLAB软件仿真结果显示,与其他方法相比,利用该方法测量的正交性误差范围明显更小、检测精度更高且运算速率更快。

Orthogonal Error Measurement of Photoelectric Encoder Based on Coordinate Rotation Digital Computer Algorithm

Through the study of the error source of the photoelectric signal output of the small photoelectric encoder,it is concluded that the orthogonal deviation is the main source of error.Then,aiming at the measurement of the orthogonality error of its output signal,an improved coordinate rotation digital calculation method is introduced,which is an algorithm based on the traditional coordinate rotation digital calculation method by improving its iterative structure.The algorithm can well realize real-time kinematic survey of the orthogonality of the signal output to the photoelectric encoder.The simulation results with MATLAB software show that compared with other methods,the orthogonality error is measured by this method with a smaller range,higher accuracy and higher computing speed.