为全球用户提供全天候、全天时、高精度的定位、导航和授时服务的国家重要空间基础设施。
As a space infrastructure of national significance, the BDS provides all-time, all-weather and high-accuracy positioning, navigation and timing services to global users.
GPS III将增强定位、授时服务和导航能力，具有先进的抗干扰性能，为全球用户提供安全、可靠和准确的服务。
GPS III will improve position, timing services, navigation and provide advanced anti-jam capabilities yielding superior system security, reliability and accuracy.
由于铷原子频标具有优良的频率和时间准确度及稳定度，被广泛应用于导航、通信、守时授时和各种科研领域。
The rubidium atomic frequency standards have been used in so many respects as navigation, communication, time transport and several science fields.
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