Research On Interference Analysis Between Large-Scale Leo Satellite Constellations

As the demand for broadband services continues to grow,network operators have already expanded the range of deployed wireless technologies and their applications.Since the non-geostationary satellite orbit satellite communication system are deployed globally,it can provide a wide range of broadband communication services for most users around the world without being restricted by the geographical environment.Provide a wide range of broadband communication services for most of the world’s users.Compared with the existing satellite systems,the deployment density of NGSO satellites has increased sharply,and the risk of interference between satellite systems has increased significantly.In order to ensure the smooth deployment of low-orbit constellations,it is necessary to carry out large-scale interference analysis and evaluation between low-orbit constellations research.In this context,this thesis firstly analyzes and sorts out the deployment and development of the current mainstream constellations,carefully sorts out the system characteristics between satellite constellations from the perspectives of constellation configuration and system frequency,and determines the type of interference that occurs between constellation systems.Construct an interference scene,establish an effective interference mathematical model for the interference scene,and propose a reasonable interference evaluation index.Based on this,an interference simulation evaluation system is built.The main research contents are as follows:1.Due to the large scale and large number of low-orbit satellite constellations,traditional research methods inevitably face the problem of low efficiency.Aiming at this key problem,an interference assessment method based on probability and statistics is proposed.Compared with the traditional simulation method based on time slice,the probability and statistics method is adopted,and numerical geometric analysis is used to obtain the pointing probability distribution of the system transceiver and the pointing probability distribution.Not limited by the simulation time,the simulation time can be effectively reduced during the interference analysis by numerical analysis.Aiming at the interference between LEO constellations,an interference mitigation algorithm based on location diversity is proposed.2.Build an efficient dynamic interference assessment model,extract common features from the current low-orbit satellite constellation,study important factors affecting interference analysis,and complete accurate modeling of models such as antenna types,satellite orbit estimation,and radio transmission,focusing on low-orbit analysis.Inter-constellation interference principle,establish accurate interference mathematical model.This thesis comprehensively evaluates the interference between LEO constellations from the link level and the system level,and completes a whole set of interference analysis simulation system,which verifies the feasibility and rationality of the interference scenarios,mathematical models and analysis methods.The conclusion shows that the interference evaluation method based on probability statistics can effectively improve the simulation efficiency,and is suitable for the analysis of interference between large-scale internet constellations.The system-level evaluation index can effectively characterize the system interference characteristics.The research in this thesis can provide technical support for the interference analysis of loworbit internet constellation systems in practical applications.