小波变换实现的光电编码器精确实时测速

Accurate real-time velocity measurement of photoelectric encoder based on wavelet transform

光电编码器作为速度反馈器件,在工业、航空航天、军事等领域应用广泛。其速度检测的准确度和响应时间直接影响了整个控制系统的性能。为此,研究了一种编码器测速信号小波变换算法,该算法能够减弱噪声和干扰的对测速精度影响。将该算法应用于某航天编码器中,改善了其控制系统的动态响应和稳态精度。具有算法简单、占用资源少、耗时短、算法通用等特点,并且可以推广到其他编码器研制中。同时,还设计了一中光电编码器速度检测系统,能够实现对光电编码器测速精度的检测。实验表明:该算法应用到编码器中,将测速误差从6.956(")/ms降低到0.370 7(")/ms。

As a velocity feedback device, photoelectrical encoder was widely used in industry, aerospace, military and other fields. The precision and response influenced the whole system performance immediately. This paper studied velocity information arithmetic by using wavelet which reduced interference and noises. This arithmetic had been applied in a space encoder, improved the dynamic response of control system, accuracy in steady-state. This arithmetic was simple, less resource, short time consuming and universal, can be extended to other encoder. Meanwhile, this paper designed velocity detection system, to achieve the detection of precision. The experiments shown that： the velocity error was reduced from 6.956 （＂）/ms to 0.370 7 （＂）/ms, by using this arithmetic.