Multi-layer Satellite Network Communication Performance Analysis Software Design And Implementation

Multi-layer satellite network can take advantage of the superiority of the differentorbital altitude of the satellite constellation to improve the stability of the satellitenetwork, reduce the transmission delay, increase the coverage area etc. So it can meetthe high reliability and quality of communication service for all users. Multi-layersatellite network composed of three-dimensional communication network with highfrequency spectrum efficiency, can use the least resources to achieve the best service.Therefore, the multi-layer satellite network becomes the trend of the future satellitenetworks. Because build multi-layer satellite communication network will take a longtime, so in the key technologies and research stage to achieve the physical verificationand testing is impossible. We can only use software emulation to complete thecomparsion of communication performance. This thesis completes the communicationperformance analysis of the multi-layer satellite communication system by usingnumerical methods and uses the C++programming language to implement the relatedfunction.Firstly, we will introduce software on analyzing performance of multi-layersatellite communication network (SAPMSCN) in a general way. We can not only brieflyunderstand the architecture and the function of different sub-systems of this software inthis chapter, but also learn the composition of each sub-system in detail.In Chapter III, the constellation structure module of SAPMSCN is analyzed. Sincemulti-layer satellite network is formed by connecting satellites with different orbitaltitude, we consider four constellations in our work: Walker, Iridium, Common-trackand GEO. Beside introducing the design method of these four constellations andproposing an algorithm to compute the covering area of each constellation,we comparethe covering area of different multi-layer satellite networks.Chapter IV analyzes the inter-satellite links (ISLs) module in SAPMSCN. ISLs canbe classified as inter-layer ISLs and intra-layer ISLs with respect to the ends of eachlink. Intra-layer ISLs are further classified as the same orbital plane ISLs and thedifferent orbital plane ISLs by whether the ends of each link are in the same orbit plane or not.Every satellite can set up inter-layer ISLs with the satellites in the neighboringorbit. We first connect the nearest satellites in different orbit and then sequentially set upother parallel ISLs by the satellite number. In this way, though we can not obtainoptimal solution to set up ISLs, the solution can satisfy basic requirement of setting upISLs. Inter-layer ISLs are setting up between the lower-layer satellites and its nearesthigher-layer satellites and we sustains this connection as long as possible to guaranteethe network stability. We simulate and analysis the propagation delay and stability ofISLs.In Chapter V, we analyse the communication performance module in SAPMSCN.This module includes link channel model, interference model and link SNRcomputation model. Different weather, geographical conditions and channel model willproduce different levels of loss. Different channel models have different interference,link budget and channel capacity computation way. We simulate and analyse thecommunication performance among different channel models with specific weather andgeographical conditions, including the handover rate, the access probability and theBER.