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Low-earth orbit megaconstellations have been developing rapidly in recent years and can provide Internet access services with wide coverage, low latency, and large capacity. Most of the existing megaconstellations are deployed in a phased, layer-by-layer manner. This has led to the discussion of single-layer constellations and the lack of research and analysis on the characteristics of multilayer constellations. To this end, the ground coverage characteristics of the multilayer low earth orbit megaconstellations and the dynamics of the intersatellite links between the layers are analyzed. The simulation results show that the coverage capability between 60° north and south latitude is significantly improved after adding the polar orbit satellite layer, and the polar coverage is further enhanced. At the same time, the establishment of interlayer intersatellite links is feasible. Although the range of interlayer links distance varies significantly and fulltime coverage is difficult to achieve due to the short link duration, the number of satellites on which interlayer links can be established is abundant. In addition, the interlayer links change periodically and predictably.
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