机抖温度特性对激光陀螺零偏稳定性的影响

Dithering mechanism temperature’s influence on bias stability

机抖机构是一个工作于谐振状态的精密机电元件,当环境温度发生变化时,机抖的抖动偏频量将发生变化,这将引起角度随机游走误差的变化,并导致激光陀螺的零偏稳定性变差。本文推导了机械抖动激光陀螺的抖动速率与激光陀螺输出误差的关系表达式,提出了均方意义下的等抖动速率控制保持激光陀螺零偏稳定性的方法,并且通过实验具体研究了电磁式机械抖动装置的温度特性及其对激光陀螺零偏稳定性的影响。仿真实验与实测数据结果表明:在全温度范围内保持机抖机构抖动速率的一致性能有效地提高激光陀螺的零偏稳定性。

The dither mechanism working in a resonant condition is a type of high-precision electromechanical component. The research works show that the dither rate will be changed with the environment temperature, which will directly cause the random walk to vibrate and lead the bias stability of output signal of RLG to get worse. The temperature character of dithering mechanism was studied by experiments. The relationship between the output error of RLG and the dither amplitude was obtained. A method for enhancing the bias stability was developed. Simulations and experiment results demonstrate the validity of this method.