高精度时间传递和同步技术有广泛的应用前景，GEO卫星可以提供高精度的单双向授时服务，但GEO 卫星的单向授时结果存在周期性波动现象，波动周期为日。通过对GEO卫星授时原理和过程的研究可知，星历预报误差、上行时延误差、转发时刻误差是造成GEO卫星单向授时结果周期性波动现象产生的主要因素，另外星历预报误差会对上行时延、转发时刻和下行时延的计算造成影响。%High‐precision time transfer and synchronization technology has broad appli‐cation prospects .GEO satellite can provide high precision of single and double time service , but the results of the GEO satellite single time service has the phenomenon of periodic fluc‐tuation ,and its fluctuation cycle is one day .Studying on the principle and process of GEO satellite time service ,we know that the main factors of the GEO satellite single time service periodic fluctuation phenomenon are ephemeris error ,uplink delay error and forwarding time error ,,the ephemeris error will impact on the calculation of uplink delay ,forwarding time and downlink delay .According to reasons of periodic fluctuation ,we can design a method to effectively decrease the GEO satellite time service periodic fluctuation .
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