带第二反馈回路的全数字闭环光纤陀螺

针对全数字闭环光纤陀螺，分析阶梯波复位不理想时对陀螺标度因数和零偏稳定性的影响。在陀螺闭环系统中加入第二反馈回路，可实现调制通道增益自动调整。研究了复位误差的解调原理，在采用积分控制规律的基础上，推导回路的传递函数，并分析系统的过渡过程和稳态误差。实验结果表明，加入第二反馈回路可以在不干扰主回路工作情况下，消除复位误差，改善陀螺性能。

All Digital Closed-loop Fiber Optic Gyroscope with the Second Feedback Loop

Aiming at all digital closed-loop fiber optic gyroscope,the influence of scale factor and bias stability was analyzed when ramp voltage reset was no ideal. The gain of the phase modulation chain would be self-correcting by means of employing the second feedback loop. The method of reset error demodulation was studied. Based on the law of integral control, the transfer function of the second feedback loop was established. Transition process and steady error were discussed. The experimentation results showed that the second feedback loop could eliminate reset error and improve performance of gyroscope without disturbance of master loop.