根据多层卫星星座网络的链路长度与可见性模型，建立了多层卫星网络的数学模型，并据此提出了一种适于多层卫星网络应用的层次路由协议。
According to the models of the link length and visibility for multiple satellite constellations, the multi-layer mathematic model of the satellite network was built in this paper.
根据所设计的多层卫星网络的星座参数，通过对层间链路几何特性的研究，分析了多层卫星网络中MEO卫星与LEO卫星的连接度性能。
Considering certain constellation parameters, the geometric characteristics of IOLs are described and the connectivity of MEO satellites and LEO satellites in the DLSN is analyzed.
空间段由低轨卫星构成，为地面用户间、地面用户与信关站之间提供通信链路；
Space segment includes LEO satellites, which provide ground users and gateways with communication links;
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