高精度单码道绝对式编码器的编码和解码研究

Single track absolute coding and decoding method for high performance encoder

本文提出了一种全新的单码道绝对编码和解码方法。编码满足"惟一性",即连续任取N位或大于N位的编码序列Ni,该序列在码道内是惟一的,并对应光栅上惟一的位移或角度值。圆光栅编码还满足"闭合性",即以任意N位编码序列N0为起始,在圆光栅码道内按位顺序选取N1、N2、……、Nn,其中n为码道内编码的位数,均满足惟一性。解码由粗值查询和细分值计算两步组成,取多个样本的均值可提高精度。基于该编码和解码方法,成功地研制出精度为2"的电子经纬仪。

A single-track absolute coding and decoding method were presented in the paper, the rule of coding in the nature of uniqueness, to select any coding sequence Ni by no less then N codes, that Ni is unique and corresponds to a sole displacement or angle value in the optical grating. Another attribute of the coding method was enclosed, beginning with any coding sequence called No, selecting the other sequences N1 , N2 ,…… Nn hit by bit, that each of them was different from others. Decoding method was composed by querying an approximation and computing a subdivision. Taking mean value from several samples could raise the accuracy of demodulation. Electronic theodolite was developed successfully by this coding and decoding method, which has 2 second precision.