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作为未来卫星移动通信系统的一个重要的研究方向,提出了一种由MEO卫星和LEO卫星共同组成的双层卫星网络(Double-LayerSatelliteNetwork,DLSN),以更好为用户提供多媒体服务。作为多层卫星网络的一个重要的研究内容,连接不同高度上卫星的层间链路(Inter-Orbit-Links,IOLs)的特性对于整个DLSN网络的性能会有很大的影响。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。采用计算机仿真的方法,给出了层间链路连接度的特性。结果表明,为了提高网络性能,在多层卫星网络中应按照一定参数有选择的建立层间链路,而不是简单的采用视距可见原则建立层间链路。
As an important research direction of future satellite mobile communication system, a Double-Layer Satellite Network (DLSN) composed of MEO and LEO satellites is proposed to provide multimedia services to users. As an important research content of multi-layer satellite networks, the characteristics of Inter-Orbit-Links (IOLs) connecting satellites at different heights have a great impact on the performance of the entire DLSN network. According to the constellation parameters of the designed multi-layer satellite network, the connectivity performance of the MEO satellite and the LEO satellite in the multi-layer satellite network is analyzed by studying the geometric characteristics of the inter-layer link. Using the method of computer simulation, the characteristic of link connectivity between layers is given. The results show that in order to improve the performance of the network, an inter-layer link should be established based on certain parameters in a multi-layer satellite network instead of simply using the principle of line-of-sight visibility to establish an inter-layer link.