Closed-loop control method and system for eliminating fiber optic gyroscope reset error

By adopting a closed-loop control method of four-state square wave modulation in an interferometric digital closed-loop fiber gyroscope, the step wave reset signal is analyzed and processed, and the demodulation value and drift coefficient are calculated and applied, the problem of fiber gyroscope reset error is solved, and the accuracy and temperature adaptability are improved.

CN116184815BActive Publication Date: 2025-03-11WUHAN HUAZHONG TIANYI INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202310096243.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-19
Publication Date
2025-03-11
Estimated Expiration
2043-01-19

AI Technical Summary

Technical Problem

There are errors in the reset process of the interference digital closed-loop fiber gyro, resulting in deterioration of noise and scale factor performance and deterioration of temperature characteristics.

Method used

Using a closed-loop control method based on four-state square wave modulation, by obtaining the signal optical power of the four modulated phases of the interference signal, analyzing whether there is a step wave reset, calculating the first closed-loop and the second closed-loop demodulated values, calculating the drift coefficient, and modulating the interference signal according to the feedback phase shift to eliminate the reset error.

Benefits of technology

It effectively eliminates the reset error of fiber gyroscopes, improves static accuracy, ambient temperature adaptability and scale factor nonlinearity.

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Abstract

The present invention discloses a closed-loop control method and system for eliminating the reset error of a fiber optic gyroscope. The steps of the closed-loop control method include: obtaining an interference signal based on a four-state square wave modulation sequence; obtaining the signal light power respectively according to the four modulation phases of the interference signal; analyzing whether the signal light power has a step wave reset; obtaining a first closed-loop demodulation value and a second closed-loop demodulation value for resetting the modulation phase according to the signal light power when the step wave of at least one modulation phase is reset; calculating a drift coefficient according to the second closed-loop demodulation value and the second closed-loop demodulation formula; calculating a feedback phase shift according to the first closed-loop demodulation value and the first closed-loop demodulation formula; and modulating the feedback interference signal according to the feedback phase shift and the modulation phase. The present invention eliminates the reset error of the fiber optic gyroscope in principle, and effectively improves the accuracy and scale factor performance of the fiber optic gyroscope.
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Citation Information

Patent Citations

  • Method for enlarging optical fiber gyroscope range

    CN101408426A

  • Signal demodulating method for inhibiting vibration error of fiber optic gyro

    CN101709971A