Research On Co-frequency Interference Analysis And High-efficient Calculation Method For Large-scale NGSO Constellation

Large scale non geostationary orbit(NGSO)satellites have received widespread attention in recent years due to their low latency,low propagation loss,and other characteristics.However,with the extensive deployment of large-scale NGSO constellation systems,the competition for frequency and orbit resources has become a bottleneck in the development of space-based information systems.In addition,the International Telecommunications Union(ITU)dominant principle for frequency and orbit resources is "first come,first served",which has led to mutual interference between a large number of NGSO satellite systems,resulting in serious co frequency interference.Compared with Geostationary orbit(GSO)satellites,the NGSO constellation has large scale,strong dynamics,multiple beams,and high flexibility.Under the traditional snapshot based interference analysis method,there are some problems such as the surge of interference combinations,unclear interference regression cycle,and complex time-varying interference relationships,which pose a huge challenge to interference analysis.In response to the above issues,this article focuses on researching efficient interference analysis methods for large-scale NGSO constellation systems.Firstly,in response to the development characteristics of future NGSO constellation multi beam and flexible beam,this article analyzes the multi beam interference scenarios of NGSO constellation,considering the number of giant constellations in orbit and the deployment of ground users.Based on traditional satellite system interference evaluation methods,a multi beam signal interference model is established,and modeling and simulation analysis between NGSO constellations are conducted from the uplink and downlink of multi beam users,And propose a system level indicator of time availability.Simulation analysis shows that the proposed analysis method can comprehensively evaluate the interference between different systems and achieve interference analysis for multiple beams in different NGSO constellations.Secondly,in response to the problem of interference combination explosion caused by massive nodes and dynamic changes in the NGSO constellation,this article introduces statistical modeling methods based on the mechanism of co-frequency interference generation.By describing the position and motion characteristics of the satellite/ground nodes in the analysis area as an existence Statistical model,the lumped interference in the area is modeled as a superimposed electromagnetic field strength,so that the interference analysis process is decoupled from the number of nodes,to significantly reduce the calculation amount of interference analysis.Thus,the distribution characteristics and intensity distribution of co frequency interference can be described more accurately.The simulation results show that the efficient calculation method for interference analysis proposed in this article has a smaller error compared to traditional link analysis results,and has good fitting performance for different numbers of terminals.It can effectively reduce the computational complexity during long-term analysis and can be used for efficient interference analysis and calculation.Thirdly,in order to verify the research results of this article,the design ideas of the interference analysis simulation platform were summarized.Based on the C # framework,supplemented by commercial orbit modeling software and Matlab calculation tools,a simulation platform with large-scale NGSO constellation co-frequency interference analysis and efficient calculation functions was built to verify the high dynamic multi flexible beam and efficient calculation method proposed in this article.Simulation verification shows that the interference analysis simulation platform built in this article can be used for NGSO constellation multi beam interference.