Frequency drift error and its compensation in polarization modulation range-finding system

Shu-yuan GAO; Yao LI; Rong-yi JI; Jun-kai SHI; Zhe-wen HU

doi:10.3788/OPE.20192702.0279

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Frequency drift error and its compensation in polarization modulation range-finding system

Modern Applied Optics | 更新时间：2020-08-13

- Frequency drift error and its compensation in polarization modulation range-finding system
- Optics and Precision Engineering Vol. 27, Issue 2, Pages: 279-286(2019)
- 作者机构：
  
  1.合肥工业大学仪器科学与光电工程学院，安徽合肥 230009
  2.中国科学院光电研究院激光测量技术研究室，北京 100094
  3.中国科学院大学，北京100049
  4.华中科技大学光学与电子信息学院，湖北武汉 430074
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192702.0279
  CLC： O436.3
- Received：03 October 2018，
  
  Accepted：31 October 2018，
  
  Published：15 February 2019
- 稿件说明：
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Shu-yuan GAO, Yao LI, Rong-yi JI, et al. Frequency drift error and its compensation in polarization modulation range-finding system[J]. Optics and precision engineering, 2019, 27(2): 279-286.
DOI：

Shu-yuan GAO, Yao LI, Rong-yi JI, et al. Frequency drift error and its compensation in polarization modulation range-finding system[J]. Optics and precision engineering, 2019, 27(2): 279-286. DOI： 10.3788/OPE.20192702.0279.

摘要

偏振调制测距方法中，频率测量的稳定性是影响测距精度的关键因素。为提高偏振调制测距系统中频率测量精度，提出一种双向扫频频率测量方法。分析了偏振调制测距原理及测频精度与测距精度的关系，探讨了频率漂移量的影响因素和频率漂移规律，证明调制深度和热致附加相位差是影响频率漂移的重要因素。利用正向扫频和反向扫频时频率漂移方向相反的特点，提出频率漂移误差补偿方法，可在低调制深度条件下补偿热致附加相位差引起的频率漂移。对距离为15.23 m的目标进行测量，频率测量标准差从3.822 9×10

Hz减小到5.807 5×10

Hz，测距误差从7.513 7 mm减小到0.866 7 mm，验证了该方法的有效性。

Abstract

To improve the accuracy of frequency measurement in a polarization modulation range-finding system

a method based on dual-directional frequency sweep was proposed. First

the principle of the ranging method and the relationship between frequency and ranging stability were analyzed. Then

factors influencing frequency drift

as well as the changing law of drift in the system

were discussed

and it was proved that modulation depth and thermally induced additional phase delay are important factors affecting frequency drift. Accordingly

a compensation method was proposed to compensate for the frequency drift caused by additional thermal phase delay

which can be realized with low modulation depth. Experimental results show that

for the target at 15.23 m

the standard deviation of frequency measurement decreased from 3.822 9×10

Hz to 5.807 5×10

the ranging error decreased from 7.513 7 mm to 0.866 7 mm

and the validity of the method was verified.

关键词

Keywords

references

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