通过对现有的卫星移动通信系统星间链路的分析发现，不但卫星移动通信系统星间链路的指向具有周期性变化的特性，而且星间链路的相对距离也在周期性变化。
Through the analysis of today's mobile satellite communication systems, it is found that not only the direction, but also the relative distance of the ISL are periodical.
通过对现有的卫星移动通信系统星间链路的分析发现，不但卫星移动通信系统星间链路的指向具有周期性变化的特性，而且星间链路的相对距离也在周期性变化。
Through the analysis of today's mobile satellite communication systems, it is found that not only the direction, but also the relative distance of the ISL are periodical.
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