Research on the strong impact vibration characterics of HPFOG

Zhisheng Zheng; Wenlong Zuo; Bohan Liu

doi:10.1117/12.2580094

5 November 2020 Research on the strong impact vibration characterics of HPFOG

Zhisheng Zheng, Wenlong Zuo, Bohan Liu

Proceedings Volume 11569, AOPC 2020: Optical Information and Network; 115690I (2020) https://doi.org/10.1117/12.2580094
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

As a kind of all solid-state FOG, high-precision FOG(HPFOG) has the characteristics of anti-shock and anti-vibration. However, when it suffers strong shock, the gyro structure and fiber loop will produce high-frequency resonance components. The projection of the resonance component in the sensitive axis of the gyro is equivalent to the input of high frequency angular vibration of the gyro, and when the frequency approaches or exceeds the working frequency of the gyro, the gyro feedback loop will generate positive feedback. Due to the low frequency of the feedback loop of HPFOG, the above-mentioned positive feedback results that the output of the cross-stripe, which makes the gyro output the wrong angular rate information. In this paper, the closed-loop feedback loop model and the structural mode of FOG are modeled and analyzed, and the mechanism of cross-stripe is discussed in detail. Then, three methods of restraining cross-stripe are given by combining the closed-loop algorithm, and the advantages and disadvantages of the method are analyzed. Finally, the test results show that the three methods can effectively suppress the HPFOG cross-stripe, and improve the HPFOG's ability to resist strong impact.

Citation Download Citation

Zhisheng Zheng, Wenlong Zuo, and Bohan Liu "Research on the strong impact vibration characterics of HPFOG", Proc. SPIE 11569, AOPC 2020: Optical Information and Network, 115690I (5 November 2020); https://doi.org/10.1117/12.2580094

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KEYWORDS

Gyroscopes

Fiber optic gyroscopes

Demodulation

Positive feedback

Feedback loops

Digital electronics

Modulation

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