Satellite-Ground Communication Link Simulation Of Geostationary Earth Orbit

Geostationary earth orbit satellite system has the characteristics of high orbital altitude,wide coverage and low-orbit monitoring and communication,and has become an important goal of China’s development of space-based information network.In this paper,aiming at the communication analysis of "Tiangong II" experimental module in China’s "day chain" system,this paper focuses on the modeling,simulation and analysis of GEO satellite terrestrial communication links.The main research contents are as follows:Established a basic model of satellite communication link.The time system and coordinate system for satellite communication link are described.The basic transmission model of vacuum RF link is established,and the evaluation index of communication link is deduced.The Monte Carlo method is used to analyze the GEO satellite communication links stochastically,which reveals the main influence factors of the star link performance.The influence of atmosphere,rainfall,cloud and path temperature on the star-to-ground link was introduced to establish an accurate model of the propagation loss in the star-to-ground link,and the simulation results were given.Using the Monte Carlo shooting method,The simulation results of shooting simulation were analyzed by factor analysis method,and the propagation loss factor that affected the quality of communication link was obtained.Three strategies to reduce the interference of GEO satellites are put forward,which provides the idea for the design and deployment of GEO satellites.The establishment of an accurate satellite communication near interference model,the analysis of the GEO satellite orbit maintenance of energy demand and the laws of geography;proposed to reduce the adjacent interference to enhance the communication link configuration strategy,and simulation verification;proposed to reduce the interference near GEO satellites Tilt self-drift strategy is proposed and simulated.The proposed strategy of coordinating GEO satellite geo-shadowing with mitigation of adjacent interference is proposed,and the simulation example is given to optimize the solution and verification.Design and development of communication link simulation software.The simulation needs of mission background are analyzed,and the functions and performance of simulation software should be analyzed.Based on the idea of ??layered architecture and component-based modeling,the overall framework and internal data flow of the software are designed.The software layered architecture design The key technology,and realize the software development.Based on the analysis task of the test and control communication of the experiment module in China,the article systematically carries out the simulation analysis and research on the characteristics of GEO satellite communication and develops the simulation software.The research results of the dissertation can provide reference for the planning and design of the measurement and control communication mission of the LEO spacecraft in the future.