随机噪声对激光陀螺输出特性的影响

分析了纯随机噪声输入和周期性抖动信号叠加随机噪声的复合抖动输入两种激励下，激光陀螺输出信号均值偏差和分散系数与随机噪声强度之间的数学关系，基于该关系公式，综合读出角速度标准差、输出信号均值偏差和分散系数，提出随机噪声强度的选择方法。研究表明，纯随机噪声减小频率闭锁影响没有应用价值，因为随机噪声的引入将导致激光陀螺测量范围的减小或输出方差的增大，这都不是理想的结果。而在周期性抖动信号基础上叠加随机噪声，并不影响激光陀螺的测量范围，却可大幅度地提高激光陀螺的读出精度，输出方差的增大可以通过延长采样周期予以减小，满足应用要求。

The Influence of Random Noise on Output of Ring Laser Gyroscope

The relationships of mean output difference and distribution index of ring laser gyroscope with the intensity of random noise are obtained. Based on the relationships, the way to design random noise is produced and exampled. The results show that pure random noise is no good to reduce the error because the introduction of random noise will reduce the measurement scope of ring laser gyroscope sharply or enlarge the output difference of ring laser gyroscope heavily. However, superimposing random noise on periodical dither signal can reduce the error deeply while the measurement scope of ring laser gyroscope is not reduced and increasing sample period moderately can reduce the enlarged output difference.