Out-of-Lock Frequency-Tracking Control of Resonant Fiber-Optic Gyro

Ming, 雷明 Lei; Huaiyong, 于怀勇 Yu; Yuan, 方圆 Fang; Yanji, 吴衍记 Wu; Zhe, 冯喆 Feng; Lizhe, 张丽哲 Zhang

doi:10.3788/cjl202047.0106002

Cited by 2 publications

(1 citation statement)

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“…Deviations in the frequency of the square wave modulation signal from the intrinsic frequency can degrade the gyroscope's accuracy [4][5][6]. Particularly in applications like long-term navigation, rapid response, and precise tracking and highprecision inertial navigation, high accuracy in maintaining the modulation square wave at the intrinsic frequency is crucial [7,8]. Furthermore, the current method for measuring the intrinsic frequency typically involves equipment such as signal generators and oscilloscopes.…”

Section: Introductionmentioning

confidence: 99%

Automatic Detection of Fiber Optic Gyroscope Intrinsic Frequency Based on Optimal Projection Approximation

Xu,

Tian

2023

Photonics

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To address the complexity and low detection accuracy issues in the intrinsic frequency detection process of fiber optic gyroscopes, a highly precise automatic measurement method based on optimal projection approximation is proposed. Building upon the digital closed-loop fiber optic gyroscope hardware circuit, this method generates a frequency-adjustable square wave with a 25% duty cycle through field-programmable gate array (FPGA) fractional division. Subsequently, it calculates the difference between the high and low levels of the sign bits of the modulated optical intensity signal sampled by the analog-to-digital converter (ADC). This yields an error signal related to the modulation frequency and intrinsic frequency. The modulation frequency is then approximated using the nearest projection of this error signal, thereby achieving automatic detection of the fiber optic gyroscope’s intrinsic frequency. The experimental results indicate that this method, requiring no external auxiliary equipment, enables rapid and highly accurate measurement of the intrinsic frequency of the fiber optic gyroscope. The measurement of intrinsic frequency takes approximately 300 milliseconds, achieving a measurement accuracy of up to 0.001 Hz.

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