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理论分析了机械抖动激光陀螺(MDRLG)闭锁误差产生的原因,给出了闭锁误差与输入角速率、机械抖动频率和机械抖动幅度的关系。针对激光陀螺读出电路整脉冲计数解调的缺陷,提出了用抛物线方程描述激光陀螺输出信号零速率点的相位特征来补偿丢失的小角速率信息,并且利用激光陀螺零速率点相位的正弦值和余弦值以及零速率点相位的二阶导数进行闭锁误差补偿的新方法。仿真实验结果表明,在整周期采样过程中,激光陀螺最大输出误差由原来的6．25％减小到0．622％,有效地减小了闭锁误差,提高了激光陀螺的检测精度。同时该方法也使激光陀螺输出信号具有良好的稳定性和重复性。
The reason why the latched error of MDRLG is analyzed theoretically is analyzed, and the relation between latching error and input angular velocity, the frequency of mechanical dithering and the amplitude of mechanical dithering is given. Aiming at the defect of demodulation of whole pulse counter in laser gyro readout circuit, this paper proposes to use the parabolic equation to describe the phase characteristics of the zero-rate point of laser gyro output signal to compensate for the missing small angular rate information. Cosine and zero-order derivative of the second derivative of the phase shift error compensation for the new method. The simulation results show that the maximum output error of the laser gyro decreases from 6.25% to 0.622% during the whole period sampling, which effectively reduces the latch-up error and improves the detection accuracy of the laser gyro. At the same time, this method also makes the laser gyro output signal have good stability and repeatability.