However, the system requires 18 satellites to cover Russia; and 24 dependable satellites operating round the clock are needed for accurate global navigation.
该系统需要18颗卫星才能覆盖俄罗斯全境，需要24颗卫星才能实现精确的全球导航。
GPS, or global positioning system, is a satellite-based navigation system made up of a network of 24 satellites.
或者说全球定位系统，是一种基于24颗卫星网络的卫星导航系统。
The third step, about 2020, built by more than 30 satellites, global coverage Compass global satellite navigation system, the system performance over the same period the international advanced level.
第三步，2020 年左右，建成由30 余颗卫星组成，覆盖全球的北斗全 球卫星导航系统，系统性能达到同期国际先进水平。
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