棱镜式激光陀螺稳频伺服系统优化分析

Optimization Analysis of Frequency Stabilization Servo System of Prisms Laser Gyro

基于对某型棱镜式激光陀螺稳频伺服系统工作原理和该系统实际工作情况的分析,建立了该陀螺稳频过程的物理模型。采用有限元分析法模拟获得跳模控制过程中谐振腔温度梯度场分布随稳频控制时间的变化规律,进而推导出谐振腔纵模跳变次数与系统控制参数的关系,得到一组针对跳模控制的系统优化控制参数。通过衡量陀螺测角速度精度的方式,进行实验验证,实验结果与模拟结果一致性较好。该研究对保证这种激光陀螺稳频系统的稳定工作以及提高数字化稳频回路的控制精度有参考价值。

A physical model of frequency stabilization process of gyro is established based on the analysis of the operating principle of frequency stabilization servo system and the study of actual operating condi- tions of the system in total reflection prism laser gyro. The law of the distribution change of temperature gradient field in cavity with the servo system control in the control process of mode jump is obtained by u- sing finite element method. The relationship between the number of longitudinal mode jumping and fre- quency stabilization servo parameters is derived. Finally, the experiments are designed to verify the best servo parameters by calculation. The experimental results show that the theoretical analysis is valid. This study is vital to insure the stable operation of servo system for laser gyro, and the results are useful to im- prove the control precision of digital circuits.