立项针对我国时间频率发布服务中对世界时UT1自主测量的重大需求面临的困难，开展“基于超大光纤陀螺仪的世界时UT1精密测量系统”研究；攻克世界时UT1所需地球自转瞬时速度精密测量系统的核心关键技术，研究灵敏度1E-6 度/小时、h因子1E-21的超大环光纤陀螺仪所涉及的基础理论和瓶颈技术，包括超大环光纤陀螺仪新原理与新型光纤光学系统，制约超大光纤Sagnac干涉仪测量精度的主要物理因素与应对策略，超大Sagnac光纤干涉仪的主要物理参数在线精密监测及自适应调整方法，超大光纤Sagnac干涉仪中1/f噪声的抑制方法和技术，局部形变对陀螺仪的干扰机制和数据补偿方法，“地球自转钟”的构建方法。研究成果是实现我国自主UT1精密测量在24小时内精度0.1ms的关键，对满足航天、国防及基础研究需求具有重要意义。

UT1 relates to the instantaneous rotation of the earth, which is the parameter most difficult to measure and predict in the earth rotation parameters. It has important applications in the earth dynamics, space and so on. The proposed Earth Rotation Clock using a super large fiber optic gyro directly observes the earth's instantaneous rotation parameters, as a supplement to VLBI astronomical techniques. Research include the principle of supper large loop fiber optic gyroscope new principle and new fiber optical system, the main physical parameter detection online and adaptive adjustment, the 1/f noise suppression, the clock measuring jammer deformation station, gyroscope data compensation and calibration method, and the system structure of Earth Clock. .Based on the h factor of fiber optic gyro is about 1E-21, the UT1 precision 0.1ms match the target of "precision measurement of physics" research plan.