Signal processing algorithm of a single-track absolute encoder for photoelectrical theodolite

Peng-fei YUAN; Da-qing HUANG; Zhong-kui LEI; Cheng XU; Jing ZHANG

doi:10.3788/OPE.20182612.3079

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Signal processing algorithm of a single-track absolute encoder for photoelectrical theodolite

Information science | 更新时间：2020-07-05

- Signal processing algorithm of a single-track absolute encoder for photoelectrical theodolite
- Optics and Precision Engineering Vol. 26, Issue 12, Pages: 3079-3086(2018)
- 作者机构：
  
  1.南京航空航天大学电子信息工程学院, 南京 210016
  2.南京晓庄学院电子工程学院, 南京 211171
  3.南京航空航天大学中小型无人机先进技术工业和信息化部重点实验室, 南京 210016
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182612.3079
  CLC： O438;TH741
- Received：16 April 2018，
  
  Accepted：14 June 2018，
  
  Published：25 December 2018
- 稿件说明：
移动端阅览
Peng-fei YUAN, Da-qing HUANG, Zhong-kui LEI, et al. Signal processing algorithm of a single-track absolute encoder for photoelectrical theodolite[J]. Optics and precision engineering, 2018, 26(12): 3079-3086.
DOI：

Peng-fei YUAN, Da-qing HUANG, Zhong-kui LEI, et al. Signal processing algorithm of a single-track absolute encoder for photoelectrical theodolite[J]. Optics and precision engineering, 2018, 26(12): 3079-3086. DOI： 10.3788/OPE.20182612.3079.

摘要

为实现快速、高精度角位移测量，提出了一种单圈绝对式电子经纬仪测角信号处理算法。只需刻画脉冲左右边沿在阈值附近各2个采样点就可以快速估计出脉冲宽度和脉冲中心坐标；对现有文献细分方法进行改进，给出了基于多组刻画脉冲中心求解高分辨力细分角的公式；并对算法时间复杂度和抗噪声性能分别进行了分析与仿真。实验结果表明，本方法在水平方向上测角误差标准差仅为2.5″，平均每秒钟可测角输出25次，具有实现简单、只需较少计算量就可以获得较高测量精度的优点。研究结果可以为单圈绝对式电子经纬仪、全站仪提供一种新的测角信号处理实用方法。

Abstract

To realize a fast and high-precision angular measurement method

this study focused on the signal processing algorithm of a single-track absolute encoder

which can be easily applied to photoelectrical theodolites. Using this algorithm

the grating line center and pulse width could be quickly estimated with only two sampling points of the rising and falling edges

by setting a threshold for the observed grating data. To improve the existing subdivision method

a high-resolution subdivision algorithm for angular measurement was provided by calculating multiple grating line centers. We also analyzed the algorithm's time complexity and anti-noise ability by simulation. Experiments were performed to evaluate the measurement precision

output stability

and running speed. The results showed that the standard deviation of error was within 2.5 seconds

and the rate of angular output was 25 times per second. This algorithm is easy to implement and has merits of both limited computation and high-precision. Thus

a new angular measurement signal-processing algorithm

which can be applied to a single-track absolute encoder for a photoelectrical theodolite or total station instrument in the future

can be developed with the results of this research.

关键词

Keywords

references

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