The European Space Agency's Galileo constellation - the world's most sophisticated satellite navigation system which was launched today - will have SELEX Galileo's PHM atomic clocks on board.

SELEX Galileo公司今天推出Galileo星座，该星座是世界上最先进的卫星导航系统，卫星上将装备SELEX Galileo公司的PHM原子钟。

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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。

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In this paper, making full use of the constraint of constellation structure, an autonomous navigation method of constellation based on inter-satellite measurement was studied.

本文充分利用星座本身构成的空间约束，研究了基于星间观测的星座自主导航方法。

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It should be noted that China has broken with Europe's Galileo navigation satellite program and will loft its own 30 satellite constellation to compete with the United States, Russian and European NavSat Systems.

CENTERFORSECURITYPOLICY: China's one world?