分析了光纤时间传递中Sagnac效应产生的原因,详细推导了地球表面任意两点间Sagnac效应授时误差的计算公式,仿真研究了Sagnac效应对光纤时间传递精度的影响。结果表明,Sagnac效应授时误差取决于光纤的纬度及其轨迹,当进行长距离时间传递时其误差值可能达到纳秒量级,必须对Sagnac效应进行精确的时延补偿或校准。 The reason of Sagnac effect in fiber time transmission is analyzed. The formula of Sagnac effect timing error between two arbitrary points on the earth surface is deduced in detail. The effect of Sagnac effect on the time accuracy of fiber transmission is simulated. The results show that the Sagnac effect timing error depends on the fiber latitude and its trajectory. When the long-distance time is transmitted, its error value may reach the order of nanoseconds, and the Sagnac effect must be accurately compensated or calibrated.