Vibration error suppression technology for fiber optic gyroscope based on partially demodulation and advanced feedback

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (15) : 60-65.

Pan Xiong, Zhang Chunsheng, Wang Xichen, Wang Xiaxiao

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Abstract

The performance of fiber optic gyroscope (FOG) changes under vibration, which leads to vibration errors, thus it is necessary for the usage of FOG to suppress the error. It was analyzed the impacts of the closed-loop tracking ability caused by the feedback delay which exists in the totally digitalized closed-loop of FOG, and the formation mechanism of vibration error was revealed that the disturbance brought in by vibration environment cannot be able to suppressed efficiently, which finally generate additional phase errors. For suppressing the error, a method named partially demodulation advanced feedback was proposed with taking the stability of the closed-loop in consideration. The additional phase error was analyzed with different advanced feedback coefficient theoretically and virtually, and the additional phase with different advanced feedback coefficient and the outputs of FOG were experimented on vibration testing platform, and it showed that the vibration errors decreased simultaneously as well as the additional phase error when increasing the advanced feedback coefficient. The Method of partially demodulation and advanced feedback was demonstrated to be appropriate for different demodulation and it can improve the adaptability of FOG for vibration environment without modification of hardware design, such as structures design and light path design etc.

Key words

fiber optic gyroscope / vibration / additional phase error / feedback channel delay / stability;

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Pan Xiong, Zhang Chunsheng, Wang Xichen, Wang Xiaxiao. Vibration error suppression technology for fiber optic gyroscope based on partially demodulation and advanced feedback[J]. Journal of Vibration and Shock, 2015, 34(15): 60-65

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