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为消除机械抖动激光陀螺的动态闭锁误差,基于闭锁误差累积角特性的分析和研究,提出了多抖动周期阶梯噪声叠加白噪声的激光陀螺随机噪声注入新方法。理论分析表明,向机械抖动装置中注入的多抖动周期阶梯噪声能使激光陀螺输出信号在整周期采样过程中具有很好的零偏稳定性,而一定强度的高斯白噪声可以减小阶梯噪声在随机常值时间内产生的积累性误差。仿真实验结果验证了多抖动周期阶梯噪声叠加白噪声的注入方法优于传统的随机噪声注入法,在减小激光陀螺输出零偏误差至同一个数量级的同时,能够使激光陀螺的零偏稳定性提高2-4倍。
In order to eliminate the dynamic blocking error of mechanical dithering laser gyro, a new method of random noise injection into laser gyro based on multi-dithering periodic stepped noise superimposed with white noise is proposed based on the analysis and study of the characteristics of the cumulative angle of blocking error. The theoretical analysis shows that multi-jitter periodic staircase noise injected into the mechanical jitter device can make the laser gyro output signal have good bias stability during the whole period sampling, and a certain intensity of Gaussian white noise can reduce the step noise Accumulative errors that occur during a random, constant time. Simulation results show that the injection method of multi-jitter periodic staircase noise superimposed on white noise is better than the traditional random noise injection method. The zero bias error of the laser gyro can be reduced to the same order of magnitude, Increase 2-4 times.