光纤陀螺环路增益高精度实时检测与闭环控制方法

High-precision real-time measurement and closed-loop control of the loop gain for fiber optic gyroscopes

传统光纤陀螺控制算法,只能保证反馈通道增益的稳定,无法实现前向通道增益的实时检测与稳定保持,而前向通道增益稳定性是影响光纤陀螺性能、反映实际条件下光纤陀螺工作状态的重要参数之一。为此,提出了一种光纤陀螺环路增益高精度实时检测与闭环控制方法,利用新引入的增益监控调制信号实现了全环路增益的实时精确检测,采用增益闭环自动控制回路实现了环路增益在预设参考最优值的稳定保持。实验结果表明,此增益检测方法可成功实现光学器件、全光路、电子器件在实际环境条件下的增益精确检测,增益闭环控制的应用将光纤陀螺在全温下的环路增益变化量由19.8%下降为0.12%,显著降低。所提出方法普遍适用于温变、振动、长期贮存等环境,在不增加硬件电路、不依赖外部设备的情况下可实现光纤陀螺全环路增益的实时准确检测与稳定控制,对光纤陀螺设计与应用具有参考意义。

The conventional control algorithm of the fiber optic gyroscope(FOG)can only achieve the stabilization of the feedback-path gain.However,the real-time detection and the stabilization of the forward-path gain,which is one of the most important parameters that affect the performances and reflect the working states of the FOG,cannot be realized.A method that achieves the high-precision real-time measurement and closed-loop control of the loop gain for the FOG is proposed.With an extra gain-monitoring modulation signal introduced,the real-time whole loop gain is detected accurately.Besides,the loop gain can be stabilized at the preset optimal value based on the proposed closed-loop automatic gain control.Experimental results show that the gain variations of optical devices,all optical loop and electronic devices under actual environmental conditions can be measured accurately,and the loop gain variation of the FOG under temperature variation is reduced from 19.8%to 0.12%significantly with the automatic gain control.The proposed method can be applied to different environment conditions,such as temperature variation,vibration,and long-term storage.What is more,the detection and stabilization of the full loop gain of the FOG is implemented without extra hardware circuits or equipment,which is referable to the design and applications of the FOG.