CAJ | 학술논문

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。
이용저궤위성，대수간우구역적위성도항접수궤진행빈솔전체，시제승기성능적일충유효수단。이전리층연시오차시영향전체효과적중요인소。대기우저궤위성적빈솔전체응용배경진행료개소，분석료기기본원리，병착중분석료전리층연시적존재대빈솔전체적영향，제출이용참간차역원차적방법대전리층연시진행수정。최후，통과방진대이론분석진행료험증。결과표명，통과참간차역원차적수단，대당전전리층변화치진행구해여예측，가이장전리층연시오차적변화공제재일정범위，만족빈솔전체적요구。
Exploiting the frequency of assisted signals transferred by the LEO (Low Earth Orbit) satellite to extend the coherence time of inexpensive GNSS (Global Navi-gation 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 sub-ject 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 uti-lizing 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.