以琼斯矩阵为基础,建立了双消偏光纤陀螺(DFOG)系统的光路传输模型,推导出偏振串扰误差的理论表达式。仿真分析了消偏器的45°角误差,偏振串扰点功率耦合,Y波导有限消光比以及环内偏振旋转角对消偏光纤系统偏振串扰误差的影响。实验验证了两消偏器45°角之间的相对偏差以及温度对陀螺零漂的影响。结果表明,两消偏器45°角之间的相对偏差越大、温度梯度越大,对陀螺精度的影响越大。 Based on Jones matrix, the optical transmission model of DFOG system is established, and the theoretical expression of polarization crosstalk error is deduced. The effects of the 45 ° angle error of the depolarizer, the power coupling of the crosstalk point, the finite extinction ratio of the Y-waveguide and the polarization rotation angle in the ring on the crosstalk error of the polarization depolarization fiber system are simulated. The experiment verifies the relative deviation between 45 ° angles of the two depolarizers and the effect of temperature on gyro zero drift. The results show that the greater the relative deviation between 45 ° angles of the two depolarizers, the greater the temperature gradient and the greater the influence on the gyro accuracy.