The city district spacenavigationsystem is closely relevant to people's daily life, provides convenient guides for the traffic, and is a significant part of a city's image.
The Launch and Test Range System includes ground-based surveillance, navigation, flight operations and analysis, command and control, communications and weather assets for space missions.
发射和测试系统包括空间飞行的地面系统任务的监视，导航，飞行操作和分析，指挥和控制，通信和气象资产。
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The European Space Agency's Galileo constellation - the world's most sophisticated satellite navigationsystem which was launched today - will have SELEX Galileo's PHM atomic clocks on board.