激光陀螺仪的机械抖动控制技术分析和研究

Analysis and research on mechanical dithering control technology of laser gyroscope

激光陀螺仪机械抖动现象,导致其出现相位移动和读取精准度降低问题,大大降低激光陀螺仪性能。因此,提出一种激光陀螺仪的机械抖动控制技术分析和研究方法,采用激光测距法构建激光陀螺仪输入输出参量模型,依据该模型通过LM神经网络训练算法对激光陀螺仪机抖控制进行稳态误差补偿,获取被测对象模型,并分析该模型的机械抖动控制约束参量,将被测对象模型和控制约束参量作为单片机软件信息,同作为硬件的数字机抖回路调相环节相配合,实现激光陀螺仪机械抖动控制相位补偿,解决激光陀螺仪在机械抖动中经出现谐振点偏离现象;同时单片机在数字机抖回路中注入随机噪声,提高激光陀螺仪读取精度,消除激光陀螺仪机械抖动的动态锁区。实验结果表明,该方法控制时滞以及误差较低,注入随机噪音后,激光陀螺仪输出时间增加,且机抖频率在10.75 Hz^12.25 Hz之间小幅度波动,可提高激光陀螺仪机械抖动稳定性,在覆盖激光陀螺仪动态锁区方面效果显著。

The mechanical dithering phenomenon of laser gyroscope reduces the dithering efficiency of resonance point and the reading accuracy of laser gyroscope,which greatly reduces the performance of laser gyroscope.Therefore,this paper put forward a kind of analysis and research method of laser gyroscope mechanical dithering control technology.The laser ranging method is adopted to build the laser gyroscope input and output parameters model.On the basis of the model,the LM neural network training algorithm is used for steady-state error compensation of laser gyroscope machine dithering control to get tested object model,and analyze the mechanical dithering control constraints parameters of the model.The measured object model and control constraint parameters can be set as the single-chip microcomputer software information,meanwhile,cooperate with numerical machine’s dithering loop phase modulation link in the hardware to realize phase compensation of laser gyroscope mechanical dithering control and to solve the resonance deviation of laser gyroscope in mechanical dithering.At the same time,random noise is injected into the digital dithering loop by single-chip microcomputer to improve reading accuracy of laser gyroscope and eliminate the dynamic locking area of mechanical dithering of laser gyroscope.The experimental results show that this method can control time delay and the low error rate.After random noise is injected,the output time of the laser gyroscope increases,and the dithering frequency fluctuates in a small range between 10.75 HZ and 12.25 HZ,which can improve the mechanical dithering stability of laser gyroscope,and it has a significant effect in covering the dynamic locking area of the laser gyroscope.