基于CD4046的激光陀螺机械抖动控制技术  

Mechanical dither control technology of laser gyro based on CD4046

作　　者：王昊仁 马家君 曾维 王媛 WANG Haoren;MA Jiajun;ZENG Wei;WANG Yuan(School of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025

出　　处：《电子设计工程》2021年第17期25-29,共5页Electronic Design Engineering

基　　金：国家自然科学基金(61605153);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号);贵州大学博士基金(贵大人基合字(2016)61号)。

摘　　要：温度变化会引起激光陀螺抖动谐振频率的改变,进而引起激光陀螺机械抖动偏频的不稳定。为此,提出了一种新的基于CD4046锁相环的激光陀螺机械抖动控制系统,并对锁相环工作原理进行分析,在分析锁相环误差传递函数的基础上,给出了CD4046锁相环的跟踪精度和同步范围等设计指标。为消除机械抖动偏频带来的动态锁区误差,采用具有随机噪声特性的m序列对机械抖动信号加噪。实验结果表明,采用锁相环跟踪抖动机构谐振频率,在变温环境下可保证陀螺不失锁且频率的跟踪误差小于0.015 Hz,陀螺精度相比于自激振荡机械抖动控制系统提升了20%。The dither resonance frequency of laser gyro will be changed due to the change of temperature,and the dither offset frequency of laser gyro will be unstable.In this paper,a new mechanical dither control system for laser gyro based on CD4046 PLL is presented,and the working principle of the PLL is analyzed.Based on the error transfer function analysis of the PLL,the tracking accuracy and synchronization range of the CD4046 PLL are given.In order to eliminate the dynamic locking error caused by the mechanical dither offset frequency,the random noise m sequence is used to add noise to the mechanical dither signal.The experimental results show that the Phase⁃Locked Loop(PLL)is adopted to track the resonant frequency of the dither mechanism,and the tracking error of the gyro is less than 0.015 Hz in the variable temperature environment.The precision of the laser gyro is improved by 20%compared with that of the self⁃excited oscillating mechanical dither control system.

关 键 词：激光陀螺 机械抖动 频率跟踪 锁相环 

分 类 号：TN248[电子电信—物理电子学]