卫星双向时间频率传递中的Sagnac效应

结合卫星双向时间频率传递技术,提出了在卫星运动情况下Sagnac效应解决方案。卫星双向时间频率传递技术是基于地球同步卫星进行的。地球同步卫星在各种摄动力的影响下,相对于地面上的某点不是绝对静止的,而是作小幅度日周期性运动。Sagnac效应与卫星和地面观测站的位置密切相关,卫星的运动直接导致了Sagnac效应也具有日周期变化的特征。使用高精度实测卫星轨道数据对Sagnac效应进行计算分析,结果表明:由卫星运动引起的Sagnac效应值具有与卫星运动一致的周日变化规律特征,大小达到几百皮秒的量级,与传统的将同步卫星作为静止点处理相比,提高了Sagnac效应误差的修正精度。该方案对于各种高精度卫星时间比对技术和卫星导航等领域具有重要的应用价值。

Sagnac Effect on Two-Way Satellite Time and Frequency Transfer

Combined with two-way satellite time and frequency transfer(TWSTFT),a Sagnac effect solution about satellite motion is proposed.The TWSTFT technique is based on geostationary satellite.As a result of the perturbation forces,the geostationary satellite is not absolutely stationary,but it does the diurnal motion with small amplitude.Sagnac effect is closely related to both satellite and earth observation station positions.The satellite’ motion makes Sagnac effect have diurnal variance characteristic.The Sagnac effect value is calculated by using the high accuracy orbit data of geostationary satellite.It is shown that the Sagnac effect value is variable with variety of satellite positions.The variety value is about several hundred picoseconds.It improves the Sagnac effect correction accuracy comparing with the conventional method assuming that the geostationary satellite is absolutely stationary.It has the important application value for all kinds of time transfer methods and satellite navigation community.