在介绍Allan方差方法的基础上,计算出了激光陀螺仪零偏测试数据的Allan方差。首次利用分段回归方法拟合Allan方差数据,得到了零偏测试中的各误差源系数。结果表明,该方法能有效地辨识出存在于激光陀螺仪零偏测试中的各种噪声,极大地降低了激光陀螺仪Allan方差数据处理的难度。指出了激光陀螺硬件中存在的误差,提出了激光陀螺仪的改进方案。 Based on the Allan variance method, the Allan variance of laser gyro bias test data is calculated. For the first time, the Allan variance data were fitted by using the piecewise regression method, and the error source coefficients in the bias test were obtained. The results show that this method can effectively identify all kinds of noise existing in the zero bias test of the laser gyro and greatly reduce the difficulty of processing the Allan variance data of the laser gyro. The error existing in the laser gyro hardware is pointed out and an improved scheme of the laser gyro is proposed.