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基于锁相环的激光陀螺抖动机构频率跟踪技术

Frequency Tracking Technology for Dither Mechanism of Laser Gyros Based on Phase Locked Loop

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摘要

基于激光陀螺抖动机构谐振频率随温度等环境因素的变化会导致抖动偏频不稳定的现象, 研究了基于锁相环的激光陀螺抖动机构谐振频率跟踪技术。在对抖动机构和锁相环传递函数分析的基础上, 应用自动控制理论, 给出了锁相环频率跟踪精度、同步范围等性能指标与抖动控制参数的一般关系。结果表明, 增大锁相环开环增益能减小频率跟踪稳态误差, 同时将导致锁相环同步范围减小。采用低开环增益启动陀螺、再采用高开环增益跟踪抖动机构谐振频率, 能保证100 ms内自动跟踪陀螺谐振频率, 在-40 ℃ 到 70 ℃温度范围内抖动机构谐振频率跟踪精度优于0.015 Hz。

Abstract

The resonant frequency of dither mechanism of laser gyro varies with the temperature and other environmental factors, resulting in dither bias instability. The resonant frequency tracking technology of dither mechanism of laser gyro based on phase-locked loop is investigated. Based on the analysis of the transfer function of the dither mechanism and the phase-locked loop, the general relationship between the performance of the frequency tracking accuracy and the range of synchronization and the dither control parameters is worked out with the automatic control theory. The results show that the increase of the open-loop gain of phase-locked loop can reduce the steady-state error of frequency tracking and the synchronization range of phase-locked loop simultaneously. The low open-loop gain is adopted to initiate laser gyro, and then high-open loop gain is used to track frequency of dither mechanism. This strategy can guarantee the gyro resonance frequency being tracked automatically within 100 ms. The frequency tracking accuracy of the dither mechanism of a laser gyro machine based on phase-locked loop is better than 0.015 Hz with temperature ranging from -40 ℃ to 70 ℃.

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中图分类号:TN248

DOI:10.3788/lop55.101401

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(61605153, 61605156)、贵州省科技厅自然科学基础研究计划(黔科合LH字[2017]7224号)、贵州省教育厅青年科技人才成长项目(黔教合KY字[2017]107)、贵州大学博士基金[贵大人基合字(2016)61号]

收稿日期:2018-02-28

修改稿日期:2018-03-02

网络出版日期:2018-04-24

作者单位    点击查看

马家君:贵州大学大数据与信息工程学院, 贵州 贵阳 550025
谢泉:贵州大学大数据与信息工程学院, 贵州 贵阳 550025
田泽安:贵州大学大数据与信息工程学院, 贵州 贵阳 550025
刘健宁:西安理工大学机械与精密仪器工程学院, 陕西 西安 710048
蒋军彪:西安现代控制技术研究所, 陕西 西安 710065

联系人作者:马家君(majiajun14041095@126.com)

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引用该论文

Ma Jiajun,Xie Quan,Tian Zean,Liu Jianning,Jiang Junbiao. Frequency Tracking Technology for Dither Mechanism of Laser Gyros Based on Phase Locked Loop[J]. Laser & Optoelectronics Progress, 2018, 55(10): 101401

马家君,谢泉,田泽安,刘健宁,蒋军彪. 基于锁相环的激光陀螺抖动机构频率跟踪技术[J]. 激光与光电子学进展, 2018, 55(10): 101401

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