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    A novel frequency-locking loop enhances resonator integrated optic gyro (RIOG) performance. This optimized loop achieves 10 kHz bandwidth, improving accuracy and bias stability for sensitive rotation rate measurements.

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    Area of Science:

    • Optics
    • Control Systems Engineering
    • Signal Processing

    Background:

    • Resonator Integrated Optic Gyros (RIOGs) are crucial for inertial navigation.
    • Enhancing RIOG bandwidth and output accuracy is an ongoing challenge.
    • Frequency-locking loops (FLLs) are key to improving gyro performance.

    Purpose of the Study:

    • To implement a low-delay, high-bandwidth FLL for RIOGs.
    • To analyze the impact of FLL parameters on gyro performance.
    • To improve the accuracy and bias stability of RIOGs.

    Main Methods:

    • Implemented a low-delay, high-bandwidth FLL on a field-programmable gate array (FPGA).
    • Utilized triangular phase modulation for signal processing.
    • Reduced signal processing delay to under 1 microsecond.
    • Developed a loop model to analyze parameter influences.

    Main Results:

    • Achieved a 10 kHz bandwidth with optimized FLL parameters.
    • Reduced FLL accuracy to 1.37 Hz (10 s integrated time).
    • Demonstrated an equivalent rotation rate sensitivity of 0.005 deg/s.
    • Improved RIOG bias stability to 0.45 deg/s (10 s integrated time).

    Conclusions:

    • The developed FLL significantly enhances RIOG performance.
    • The FLL approaches the ultimate sensitivity limits of the RIOG.
    • This technology offers improved accuracy and stability for rotation sensing applications.