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    Area of Science:

    • Navigation Systems Engineering
    • Control Systems Engineering
    • Sensor Technology

    Background:

    • Inertial Navigation Systems (INS) accuracy is improved by rotation modulation to compensate for sensor biases.
    • Carrier angular motion and control errors can degrade rotation modulation effectiveness and navigation accuracy.

    Purpose of the Study:

    • To develop a novel rotation control scheme for single-axis rotation INS to improve accuracy.
    • To achieve both rotation modulation of sensor biases and azimuth motion insulation.

    Main Methods:

    • Employing fiber optic gyros to control the inertial measurement unit (IMU) rotation angular velocity.
    • Optimizing the control strategy by rotating the IMU about the platform frame's z-axis relative to the navigation frame.
    • Reducing control error by shortening data transfer delay time using interrupt mode.

    Main Results:

    • The proposed method successfully modulates inertial sensor biases and insulates azimuth motion.
    • Achieved steady-state control error below 10" and overshoot control error below 50".
    • Navigation position error reduced by up to 50% compared to traditional single-axis rotation INS (SRINS).

    Conclusions:

    • The novel rotation control scheme effectively enhances INS accuracy.
    • The method provides a significant improvement in navigation performance for single-axis rotation INS applications.