T-type feedback network applied in resonance frequency locking of resonator fiber optic gyro

Li Shengkun; Zheng Yongqiu; An Panlong; Li Xiaofeng; Chen Hao; Jiao Xinquan; Liu Jun; Yan Shubin

For resonator fiber optic gyro (R-FOG), resonance frequency locking is a key technique at detecting the gyro signal. The stability of resonance frequency locking determines the output performance of the gyro, especially in the long-term test. According to the transmission theory of fiber ring resonator (FRR), the resonance characteristics and the first harmonic were analyzed; the R-FOG system was set up. The first harmonic demodulation signal derive from the experiments using the sine wave phase modulation technique; the drift errors of traditional analog proportional-integral PI consisting of operational amplifiers were analyzed. On this basis, T-type feedback network was applied in resonance frequency locking of R-FOG. The drift error was suppressed effectively and better result was obtained. The stability of resonance frequency locking for 4 000 s is superior to 910-12 by Allan variance analysis.

1. Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education,North University of China,Taiyuan 030051,China;

2. National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan 030051,China;

3. School of Automation,Beijing Institute of Technology,Beijing 100081,China

Received Date: 2013-08-06

Rev Recd Date: 2013-09-08

Publish Date: 2014-04-25

Key words:

Abstract: For resonator fiber optic gyro (R-FOG), resonance frequency locking is a key technique at detecting the gyro signal. The stability of resonance frequency locking determines the output performance of the gyro, especially in the long-term test. According to the transmission theory of fiber ring resonator (FRR), the resonance characteristics and the first harmonic were analyzed; the R-FOG system was set up. The first harmonic demodulation signal derive from the experiments using the sine wave phase modulation technique; the drift errors of traditional analog proportional-integral PI consisting of operational amplifiers were analyzed. On this basis, T-type feedback network was applied in resonance frequency locking of R-FOG. The drift error was suppressed effectively and better result was obtained. The stability of resonance frequency locking for 4 000 s is superior to 910-12 by Allan variance analysis.

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Reference (25)

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T-type feedback network applied in resonance frequency locking of resonator fiber optic gyro

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