Journal of Systems Engineering and Electronics ›› 2025, Vol. 36 ›› Issue (1): 224-232.doi: 10.23919/JSEE.2025.000010

• CONTROL THEORY AND APPLICATION • Previous Articles    

Vibration-induced bias error reduction using loop gain compensation for high-precision fiber optic gyroscopes

Heyu CHEN1,2(), Xuexin QIN1(), Huan XIE3(), Linghai KONG4(), Yue ZHENG1,*()   

  1. 1 School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China
    2 Beijing Institute of Computer Technology and Application, Beijing 100854, China
    3 Hunan Shuaiwei Control Technology Co., LTD, Changsha 421000, China
    4 Beijing Institute of Control and Electronic Technology, Beijing 100038, China
  • Received:2024-01-19 Online:2025-02-18 Published:2025-03-18
  • Contact: Yue ZHENG E-mail:chy563413420@outlook.com;qinxuexin@buaa.edu.cn;warden819@163.com;konglinghai1990@163.com;zhengyue@buaa.edu.cn
  • About author:
    CHEN Heyu was born in 1995. He received his M.S. degree from the School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing, China, in 2020. He is currently an engineer at Beijing Institute of Computer Technology and Application. His current research interests include optical sensing. E-mail: chy563413420@outlook.com

    QIN Xuexin was born in 1998. She received her B.S. degree in electronic information engineering from University of Electronic Science and Technology of China. She is currently pursuing her Ph.D. degree in the School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing, China. Her current research interests include optical sensing and control technology. E-mail: qinxuexin@buaa.edu.cn

    XIE Huan was born in 1985. He received his B.S. degree in polymetric materials from Xiangtan University. He is currently an engineer at Hunan Shuaiwei Control Technology Co., LTD, Changsha. His current research interests include optical sensing and inertial navigation system. E-mail: warden819@163.com

    KONG Linghai was born in 1990. He received his Ph.D. degree from the School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing, China, in 2023. He is currently an engineer at Beijing Institute of Control and Electronic Technology. His current research interests are optical sensing, control and electronic technology. E-mail: konglinghai1990@163.com

    ZHENG Yue was born in 1990. He received his Ph.D. degree from the School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing, China, in 2018. He is currently an associate professor at Beihang University. His current research interests are optical sensing and optical imaging. E-mail: zhengyue@buaa.edu.cn
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    Co-first author

  • Supported by:
    This work was supported by the Fundamental Research Funds for the Central Universities (YWF-23-L-1225), National Natural Science Foundation of China (62201025) and Chinese Aeronautical Establishment (2022Z037051001).

Abstract:

Vibration-induced bias deviation, which is generated by intensity fluctuations and additional phase differences, is one of the vital errors for fiber optic gyroscopes (FOGs) operating in vibration environment and has severely restricted the applications of high-precision FOGs. The conventional methods for suppressing vibration-induced errors mostly concentrate on reinforcing the mechanical structure and optical path as well as the compensation under some specific operation parameters, which have very limited effects for high-precision FOGs maintaining performances under vibration. In this work, a technique of suppressing the vibration-induced bias deviation through removing the part related to the varying gain from the rotation-rate output is put forward. Particularly, the loop gain is extracted out by adding a gain-monitoring wave. By demodulating the loop gain and the rotation rate simultaneously under distinct frequencies and investigating their quantitative relationship, the vibration-induced bias error is compensated without limiting the operating parameters or environments, like the applied modulation depth. The experimental results show that the proposed method has achieved the reduction of bias error from about 0.149°/h to 0.014°/h during the random vibration with frequencies from 20 Hz to 2000 Hz. This technique provides a feasible route for enhancing the performances of high-precision FOGs heading towards high environmental adaptability.

Key words: vibration-induced error, fiber optic gyroscope (FOG), loop gain