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中文摘要：
利用低轨卫星,对受干扰区域的卫星导航接收机进行频率传递,是提升其性能的一种有效手段.而电离层延时误差是影响传递效果的重要因素，对基于低轨卫星的频率传递应用背景进行了介绍,分析了其基本原理,并着重分析了电离层延时的存在对频率传递的影响,提出利用站间差历元差的方法对电离层延时进行修正，最后,通过仿真对理论分析进行了验证，结果表明,通过站间差历元差的手段,对当前电离层变化值进行求解与预测,可以将电离层延时误差的变化控制在一定范围,满足频率传递的要求。
英文摘要：
ABSTRACT Exploiting the frequency of assisted signals transferred by the LEO （Low Earth Orbit） satellite to extend the coherence time of inexpensive GNSS （Global Navigation Satellite System） receiver clocks, is one of the most effective methods to improve the performance of GNSS receivers that may be in the hostile environments or subject to interference. Among the factors disturbing the results of frequency transfer, ionospheric delay is the most important one. In this work, the principles for frequency transfer utilizing the LEO satellite and the corresponding error sources are analyzed. Especially, the impact of ionospheric delay is analyzed, and a correction method utilizing the ionospheric delay difference between the neighboring epoches/the users and the reference stations is presented. Simulations are performed to validate the above analysis and correction method. The results show that with correction proposed in this paper, the requirements for the frequency transfer can be met.
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