Global architecture of satellite networks 2.2 Satellite-ground Link.

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... the core infrastructure of informationized warfare, the satellite and its terrestrial infrastructure together constitute a satellite network which plays an extremely important role in earth observation, navigation and positioning. For the convenience of description, we abstract the entire satellite network into three layers: the spatial layer, the ground layer and the user layer, as shown as Figure 1. The spatial layer is composed of communication satellites of different orbits, whose networking mode is not the focus of this paper, and thus we omit it here. ...