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《Journal of Zhejiang University(Engineering Science)》 2010-01
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Precision analysis of frequency lock-in technique in resonator micro optic gyroscope

BAO Hui-qiang,MAO Hui,MA Hui-lian,JIN Zhong-he(Department of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China)  
In resonator micro optic gyro (R-MOG) system,optical elements,which are easily affected by environmentally-induced thermal and strain perturbations,induce various noises which restrict the precision of lock-in frequency.Instead of the first-order inertia link,proportion integration (PI) controller was adopted in the feedback loop to reduce these noises and then improve the lock-in precision.An analytical model was setup,and the influences of the first-order inertia link and PI controller on the accuracy of lock-in frequency were analyzed and compared.PI controller technique can remove the steady-state error of the step response,so it can reduce the influence of the reciprocal noises by the environmentally-induced thermal and strain perturbations.The parameters of PI controller were optimized through simulation.Using the optimized PI controller in R-MOG system,the threshold for the lock-in frequency of 30 Hz was achieved;which was equivalent to the rotation sensitivity of 0.15°/s for an R-MOG with a 7.9 cm length micro ring resonator chip.Gyro rotation signal at 20°/s is best demonstrated in the above mentioned R-MOG system.
【Fund】: 高等学校博士学科点专项科研基金资助项目(20060335064)
【CateGory Index】: TP212.14
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