最后，对星座卫星通信系统安全预警机制的关键技术进行了讨论。
At last, this paper discussed the key technologies which were used for security warn mechanism.
星座设计是卫星移动通信系统设计一个非常关键的内容，直接关系到系统的性能与成本。
Constellation design is one of the key contents for the design of satellite communications system.
讨论了区域卫星导航系统卫星星座设计中所用卫星轨道类型。
The orbit of the satellite constellation for local navigation system is discussed.
讨论了区域卫星导航系统卫星星座设计中所用卫星轨道类型。
The orbit of the satellite constellation for local navigation system is discussed.
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