激光测距系统整形模块和低通滤波模块优化设计

尤政1; 杨冉1; 张高飞1; 薛旭峰1; 叶良琛1

doi:10.3788/OPE.20132110.2527

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激光测距系统整形模块和低通滤波模块优化设计

现代应用光学 | 更新时间：2020-08-12

- 激光测距系统整形模块和低通滤波模块优化设计
- Optimization of Shaping Circuit and Low-pass Filter in Laser Ranging System
- 光学精密工程 2013年21卷第10期页码：2527-2534
- 作者机构：
  
  1. 清华大学精密仪器系
  2. 清华大学精密测试技术及仪器国家重点实验室
- 作者简介：
- 基金信息：
  
  863专项项目()
- DOI：10.3788/OPE.20132110.2527
  中图分类号： TP247;TN713
- 收稿日期：2013-04-10，
  
  修回日期：2013-05-13，
  
  网络出版日期：2012-10-19，
  
  纸质出版日期：2013-10-15
- 稿件说明：
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尤政杨冉张高飞薛旭峰叶良琛. 激光测距系统整形模块和低通滤波模块优化设计[J]. 光学精密工程, 2013,21(10): 2527-2534

YOU Zheng YANG Ran ZHANG Gao-fei XUE Xu-feng YE Liang-chen. Optimization of Shaping Circuit and Low-pass Filter in Laser Ranging System[J]. Editorial Office of Optics and Precision Engineering, 2013,21(10): 2527-2534
尤政杨冉张高飞薛旭峰叶良琛. 激光测距系统整形模块和低通滤波模块优化设计[J]. 光学精密工程, 2013,21(10): 2527-2534 DOI： 10.3788/OPE.20132110.2527.

YOU Zheng YANG Ran ZHANG Gao-fei XUE Xu-feng YE Liang-chen. Optimization of Shaping Circuit and Low-pass Filter in Laser Ranging System[J]. Editorial Office of Optics and Precision Engineering, 2013,21(10): 2527-2534 DOI： 10.3788/OPE.20132110.2527.

摘要

由于减小相位式激光测距系统的鉴相误差可提高测距精度，本文对鉴相器前置整形模块和后置滤波模块进行了优化设计，以提高鉴相精度。针对整形模块，引入了迟滞比较器，克服了传统开环比较电路在实际噪声条件下存在的多重触发缺陷，解决了鉴相器输出方波高电平宽度不稳定的问题。针对滤波模块，介绍了基于MC4044鉴相芯片的两种典型放大/滤波电路及其缺陷，使用FilterPro软件设计了4阶有源低通滤波器，并说明了它相对于典型设计的优势。实验结果表明：相比于开环比较器，本文设计的迟滞比较器避免了接地（GND）噪声引起的多重跳变现象，输出方波的上升沿时间由1.66 s下降为108 ns；与基于MC4044的两种典型放大/滤波模块设计相比，本文设计的低通滤波电路克服了输出DC电平值非线性变化的缺陷线性度（R2）值由0.908 3提高至0.999 9）和灵敏度较低的缺陷（转化增益常量提高了96.5%），而输出DC电平上的干扰信号峰峰值则由50~230 mV下降至10~20 mV，有效减少了后级的A/D采样误差，提高了鉴相精度。

Abstract

As the phase discrimination error of a phase laser ranging system effects its ranging accuracy

this paper optimizes the designs of a preceding stage (shaping circuit) and a subsequent stage (low-pass filter) in the phase detector. For the shaping circuit

a comparator with hysteresis was designed to avoid the multiple-triggered phenomenon caused by the noise on GND for open loop filters

and stabilizes the output of phase detector. For the low-pass filter

two typical amplifier/filter circuits based on MC4044 and their defects were introduced

a 4th-order low-pass filter was designed by using FilterPro

and its advantages were presented. Experimental results indicate that the multiple-triggered phenomenon is eliminated by using the hysteresis comparator designed

and the rise-time of output square wave falls to 108 ns from 1.66 s as compared with that of a traditional opened-loop comparator. Furthermore

the 4th-order filter designed in this paper improves the linearity and sensitivity of the DC output

the linearity(R2) increases from 0.908 3 to 0.999 9

and the convention gain improves by 96.5% as compared with that of the typical designs of amplifier/filter circuits. Moreover

the peak-to-peak value of the interference signal on a Low Pass Filter(LPF) DC output decreases from 50-230 mV to 10-20 mV

which reduces the phase detection error effectively.

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references

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