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。

However, the system requires 18 satellites to cover Russia; and 24 dependable satellites operating round the clock are needed for accurate global navigation.

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GPS折射角资料具有分辨率高、全天候探测、覆盖全球等优点，实现对GPS折射角资料的变分同化，将具有非常重要的意义。

There are many advantages of the GPS bending Angle, such as high resolution, availability in all weather conditions, and global data coverage.

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为了提高移动通信系统的容量和效率、实现全球无缝覆盖，必须实现低轨卫星移动通信系统与地面通信系统之间的有机综合。

It is necessary to integrate the LEO satellite communication systems and terrestrial mobile communication systems for improving the capacity and efficiency, achieving global seamless coverage.

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