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All-digital signal-processing open-loop fiber-optic gyroscope with enlarged dynamic range.

Qin Wang, Chuanchuan Yang, Xinyue Wang

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    Summary

    A novel fiber-optic gyroscope (FOG) utilizes an all-digital signal-processing system and a Sagnac phase-shift tracking method. This advanced open-loop FOG significantly improves bias instability, angle random walk, and dynamic range compared to conventional designs.

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    Area of Science:

    • * Optical Engineering
    • * Inertial Navigation Systems

    Background:

    • * Conventional open-loop fiber-optic gyroscopes (FOGs) face limitations in dynamic range and bias stability due to source intensity variations and drift.
    • * Existing digital signal processing (DSP) methods often struggle to suppress these instabilities effectively.

    Purpose of the Study:

    • * To develop and demonstrate a new open-loop FOG with enhanced performance characteristics.
    • * To achieve simultaneous improvements in dynamic range and sensitivity.
    • * To overcome the limitations of traditional FOGs through advanced digital processing.

    Main Methods:

    • * Implementation of an all-digital signal-processing (DSP) system.
    • * Employment of an all-digital phase-locked loop (PLL) for digital demodulation.
    • * Introduction of a Sagnac phase-shift tracking method to expand the dynamic range.

    Main Results:

    • * Bias instability reduced from 0.259 to 0.018 deg/h.
    • * Angle random walk decreased from 0.031 to 0.006 deg/h(1/2).
    • * Dynamic range significantly enlarged to ±360 deg/s, surpassing the conventional ±63 deg/s limit.

    Conclusions:

    • * The proposed all-digital open-loop FOG achieves superior bias stability and a substantially larger dynamic range.
    • * The integration of an all-digital PLL and Sagnac phase-shift tracking is key to performance enhancement.
    • * This advanced FOG technology offers a significant improvement for applications requiring high precision and wide dynamic range inertial sensing.