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A multi-frequency signal processing method for fiber-optic gyroscopes with square wave modulation.

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    |February 12, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new demodulation method for square wave modulated interferometric fiber-optic gyroscopes (IFOGs), significantly reducing noise and improving the detection of Earth's rotation rate.

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    Area of Science:

    • Optoelectronics
    • Optical Sensing
    • Signal Processing

    Background:

    • Interferometric fiber-optic gyroscopes (IFOGs) performance is limited by noise from optoelectronics.
    • Bias stability and random walk coefficients (RWC) are critical IFOG performance metrics affected by noise.

    Purpose of the Study:

    • To develop a novel demodulation method for square wave modulated IFOGs.
    • To suppress white noise, optical intensity noise, circuit noise, and shot noise.
    • To improve the real-time output variance in detecting Earth's rotation rate.

    Main Methods:

    • Orthogonal harmonic demodulation.
    • Matched filtering to extract Sagnac phase.
    • Principle Component Analysis (PCA) for optimal quadrature signal channels.
    • Difference procedure for signal processing.

    Main Results:

    • Demonstrated suppression of various noise sources in IFOGs.
    • Achieved real-time output variance improvement in an experimental IFOG sample.
    • Experimental results closely matched theoretical Cramér-Rao bound (CRB) calculations.

    Conclusions:

    • The novel demodulation method effectively reduces noise in IFOGs.
    • The proposed method enhances the accuracy of Earth's rotation rate detection.
    • This technique offers a significant advancement for IFOG performance.