Research On The Structural Analysis And Performance Evaluation Of The Integrated Space-ground Network

Network architecture design,the key technology of networking,is the basis of various networking algorithms in the Integrated Space-Ground Network.It has an important impact on the level of system cost,efficient communication of the entire network,and management of the network.On the one hand,the structure of the network has a great influence on the performance of the network.For example,the configuration of satellite constellations,the number of inter-satellite links between satellites,and the connection design method of inter-satellite links,the layout of ground stations,etc.will affect Network coverage performance,network capacity,and other performance indicators.On the other hand,due to the long time period for satellite launch planning in the Integrated Space-Ground Network,it is impossible to achieve physical verification and testing in the key technology research,and the special nature of the space-based environment also makes it very difficult to upgrade satellites.Therefore,the Integrated Space-Ground Network requires a more detailed planning process for the network structure.An effective comprehensive analysis of the network is a prerequisite for network optimization.Therefore,this paper combines the graph theory to analyze the network structure of the Integrated Space-Ground Network.The paper is orgnised as follows:For the space-based part of the Integrated Space-Ground Network,we taking a typical constellation as the object of analysis,the dynamic change characteristics of the topological structure and the effect of the satellite antenna beam in the constellation on the global coverage performance are analyzed.The capacity of the constellation in the space-based part of the integrated Space and Ground network was analyzed.This paper presents a method for capacity analysis of polar orbit constellations under the rules of link building between inter-satellite links.By modeling the polar orbit constellations as a two-dimensional lattice network,it is deduced under the “all-to-all” service model.the network capacity of the polar orbit constellation is obtained under the given shortestpath algorithm.This paper analyzes the optimization of the terrestrial station site of the Integrated Space-Ground Network,and explores the influence of the parameters such as the inter-satellite link bandwidth and the feeder link bandwidth on the capacity of the Integrated Space-Ground Network.To overcome the deficiencies of the traditional time-varying graph in modeling the Integrated Space-Ground Network,the time-varying diagram modeling and analysis are used in this paper,taking into account the construction rules of inter-satellite links and the number of antennas of satellite nodes and ground station nodes in the network.At the same time,according to the topological characteristics of the constellation and the distribution characteristics of the global satellite business,the business was characterized.Finally,the simulation analysis of the proposed capacity analysis model of the Integrated Space-Ground Network is carried out.The research results can provide a valuable reference for the construction of the Integrated Space-Ground Network.