Visibility Analysis And Routing Algorithm Research Of Satellite Communication Network

In recent years,satellite communication technology has entered a stage of rapid development,and people’s daily life depends on satellite communication degree has gradually deepened,proceed to the next step have higher requirements for the speed and quality of communication.In order to explore the factors that affect communication quality and improve communication quality,the research is carried out from both visibility and routing algorithm.Through visibility analysis,factors that affect communication quality are explored,and communication quality is improved through routing algorithms.The main research content is as follows:Firstly,obtain the position information of the satellite.By simplified general perturbation(SGP4)model to predict satellite position vector information,the reasons for model errors are analyzed,and the accuracy of the model is verified by the satellite tool kit(STK).The determination of satellite position is the foundation of visibility research.Secondly,based on the satellite position,determine the geometric relationship between each satellite and conduct research on visibility algorithms.According to different visibility subjects,visibility issues can be divided into two categories: inter satellite visibility and satellite-terrestrial visibility.The issue of inter satellite visibility includes visibility between near Earth satellites and visibility between near Earth and high orbit satellites.The visibility analysis between near-Earth satellites considers factors such as Earth’s obstruction of the satellite and antenna angle,and analyzes them from geometric visibility,antenna angle size,and other aspects;The visibility between low Earth and high orbit satellites is determined based on the half cone angle of the high orbit satellite’s field of view.The issue of satellite-terrestrial visibility includes the visibility of ground station near Earth satellites and the visibility of ground station high orbit satellites.In the visibility analysis of ground station near Earth satellites,the influence of Earth rotation on satellite observation is considered,and the calculation is simplified by introducing sub satellite points,relying on the visible spherical cap for solution;The visibility between ground station high orbit satellites is analyzed based on the satellite’s altitude angle.The above is a qualitative analysis of visibility,followed by a quantitative analysis of visibility.Add constraints to the qualitative visibility analysis results and propose a visibility quality evaluation index to quantitatively describe the degree of visibility.Finally,conduct research on routing algorithms.Based on the visibility analysis results,convert the satellite into nodes and establish an undirected graph.The Dijkstra algorithm can find the shortest path from the start node to the end node in an undirected graph,but it can only solve single parameter problems and cannot solve multi constraint problems.To address the limitations of the Dijkstra algorithm,a single combined scale(SMM-LS)algorithm combined with link state is proposed,which solves the limitations of single parameter calculation and normalizes the combination of multiple parameters.At the same time,introduce the genetic algorithm and ant colony algorithm commonly used to solve multi constraint problems,and propose an improved genetic ant colony algorithm to address the shortcomings of the two algorithms,solving the problems of long iteration time and low accuracy.Then,visualize the research process on the web page and demonstrate the entire process of routing establishment.Ultimately,communication quality is improved by improving visibility quality evaluation indicators and improving the iteration speed of routing algorithms.