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零闭锁激光陀螺(ZLG)增益曲线不对称导致左、右旋陀螺的比例因子修正系数不相等,使得当陀螺稳频工作点与磁不敏感点存在频率差时,陀螺零偏对外界磁场变化敏感,降低了陀螺的精度并限制了使用环境。利用兰姆半经典理论分析计算了比例因子修正系数与增损比的关系,并得到了陀螺的磁不敏感点与放电电流的关系,从信号处理系统中排除放电电流变化对控制信号的影响,并进行了实验验证。理论计算和实验结果均表明,线性地改变陀螺放电电流,陀螺磁不敏感点位置会因增益曲线的增损比变化而发生相应线性改变,进而能够通过控制放电电流降低陀螺的磁灵敏度。
The unbalanced gain curve of zero locked laser gyro (ZLG) causes the scaling factors of the left and right gyroscopes to be unequal, which makes the gyro zero offset sensitive to the change of the external magnetic field when there is a frequency difference between the gyro frequency stabilizing working point and the magnetically insensitive point , Reducing the accuracy of the gyro and limiting the use of the environment. Based on the semi-classical Lamborghini theory, the relationship between the correction factor and the loss ratio is analyzed. The relationship between the magnetism insensitive point and the discharge current is obtained. The influence of the discharge current on the control signal is excluded from the signal processing system. And experimental verification. Both theoretical calculation and experimental results show that linearly changing the gyro discharge current, the position of the gyro magnetically insensitive point will change linearly due to the increase or decrease of the gain curve, and the magnetic sensitivity of the gyro can be reduced by controlling the discharge current.