基于全数字锁相环的光纤陀螺本征频率跟踪技术  

Eigen frequency tracking technology of fiber-optic gyroscopes based on an all-digital phase-locked loop

作　　者：杨辉 马家君 高辉 吕明森 孙佑焮 敖晓纯 YANG Hui;MA Jiajun;GAO Hui;LMingsen;SUN Youxin;AO Xiaochun(College 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：《传感器与微系统》2025年第3期29-32,36,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(62163006)。

摘　　要：针对光纤陀螺(FOG)本征频率检测过程复杂和测量精度低的问题,提出了一种基于全数字锁相环(ADPLL)的高精度本征频率跟踪技术。理论研究了调制频率、本征频率与干涉光强之间的关系,在占空比为25%的方波调制下,可以将光纤环形干涉仪作为鉴相器,设计K计数环路滤波器和数字控制振荡器构成ADPLL电路。根据进位信号和借位信号实时调整调制信号的频率,当进位信号和借位信号脉冲数相等时,调制信号频率即为FOG的本征频率。实验结果表明:基于ADPLL的FOG本征频率跟踪技术跟踪精度优于0.4 Hz,跟踪时间小于0.009 s。与传统的FOG本征频率测量方法相比,该方法不需要外部辅助设备,可以快速、高精度地跟踪FOG的本征频率。Aiming at the problem of complex detection process and low measurement precision of eigen frequency of fiber-optic gyroscope(FOG),a high-precision eigen frequency tracking technique based on all-digital phase-locked loop(ADPLL)is proposed.The relationship between modulation frequency,eigen frequency and interferometric light intensity is theoretically studied.Under square wave modulation with a duty cycle of 25%,the fiber ring interferometer can be used as a phase detector,and a K-counting loop filter and a digitally-controlled oscillator are designed to form an ADPLL circuit.The modulation signal frequency is adjusted in real-time according to carry and borrow signals,the modulation signal frequency is eigen frequency of FOG when the pulse counts of the carry and borrow signals are equal.The experimental results show that the tracking precision of this technique is prior to 0.4 Hz and the tracking time is less than 0.009 s.Compared to traditional methods,this method does not require external auxiliary equipment and can track the eigen frequency of FOG quickly and accurately.

关 键 词：光纤陀螺 本征频率 全数字锁相环 跟踪测量 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] V241.5[自动化与计算机技术—控制科学与工程]