四频差动激光陀螺自适应腔长控制方法  

Self-adaptive cavity length control method for four-frequency differential laser gyroscope

作　　者：刘梦泽 马冲泽 吴长进 王铭灏 王辉 LIU Mengze;MA Chongze;WU Changjin;WANG Minghao;WANG Hui(Avic Xi’an Flight Automatic Control Research Institute,Xi’an 710065,China)

机构地区：[1]航空工业飞行自动控制研究所,西安710065

出　　处：《中国惯性技术学报》2022年第4期525-530,共6页Journal of Chinese Inertial Technology

基　　金：装备预研项目(50917010103)。

摘　　要：相较于传统的小抖动腔长控制,自适应腔长控制方法实现了四频差动激光陀螺理想工作点的自动跟踪功能。所提方法在小抖动腔长控制的基础上,通过对光强调制信号的基波和二次谐波进行解调,增加了光强增益控制环路和调制控制环路。通过改进硬件电路和控制算法将增益、调制和腔长3个控制环路紧密耦合在一起,实现四频差动激光陀螺自适应腔长控制系统,从而达到四频差动激光陀螺理想工作点自动跟踪功能。实验结果表明,自适应腔长控制能够消除外界环境、光强、电子元件参数等变化对四频差动激光陀螺工作点的影响,使得四频差动激光陀螺工作在理想工作点上,提升陀螺变温零偏稳定性51%和减小变温零偏最大变化44%。Compared with the traditional small dither cavity length control,the self-adaptive cavity length control method realizes the automatic tracking function of the ideal operating point of non-coplanar four-frequency laser gyroscope.On the basis of small dither cavity length control,the proposed method increases the light intensity gain control loop and modulation control loop by demodulating the fundamental wave and second harmonic of the optical intensity modulation signal.By improving the hardware circuit and control algorithm,the gain,modulation and cavity length control loops are tightly coupled together,and the self-adaptive cavity length control system is realized,so as to achieve the automatic tracking function of the ideal operating point of non-coplanar four-frequency laser gyro.The experimental results show that the self-adaptive cavity length control can eliminate the influence of external environment,light intensity,electronic component parameters and other changes on the operating point of non-coplanar four-frequency laser gyro,and make the non-coplanar four-frequency laser gyro work at the ideal operating point which can improve the variable temperature bias stability of the gyro by 51%and reduce the maximum variation of bias deviation at variable temperature by 44%.

关 键 词：四频差动激光陀螺 自适应腔长控制 理想工作点 小抖动腔长控制 

分 类 号：U666.1[交通运输工程—船舶及航道工程]