Research On Satellite Constellation Design And Routing Based On Multi-objective Optimization

With the increasing demand for space communication,key technologies in satellite communication network,such as constellation design,path optimization,transmission control and security technology,have attracted more and more attention.In order to achieve wide coverage,low delay,and high reliability of spatial information transmission,and ensure the coverage performance and communication quality of satellite constellation on the ground under a variety of constraints,this paper studies in depth satellite constellation design and routing schemes.The details are as follows:Firstly,the background and significance of satellite communication are introduced.The theoretical basis of satellite constellation design and routing is elaborated in detail.Combining with multi-objective theory and its application in satellite communication,the existing optimization methods of satellite constellation and the shortest path optimization algorithm are analyzed and summarized.Secondly,aiming at the coverage problem of satellite networks to specific regions,a multi-objective constellation optimization design scheme is proposed.Firstly,the geometric coverage model of current satellite network is analyzed,and the target area is regularized into region blocks represented by latitude and longitude.Then,a scheme based on the single orbital inclination and coverage area is proposed to minimize the number of satellite orbits and the total number of constellations,which reduces the size of the constellation.Finally,considering both of the coverage rate and the multiple coverage of the target regions,a multi-objective satellite constellation optimization design scheme is proposed to achieve the optimal constellation configuration under the trade-off between various performance indexes.The simulation results show that the proposed four satellite constellation schemes can achieve better coverage performance with fewer satellites.Finally,aiming at the problem of frequent link switching and single path transmission link measurement in satellite communication network,a routing scheme based on multi-objective optimization is proposed.First,the satellite network is divided into time slots by the periodic variation of satellites,and the discrete model is established.Then,considering the connectivity of dynamic satellite links,the residual bandwidth of links and the residual energy of satellites,a multi-objective optimization model is established,and the weight scheme for path selection is redefined.Finally,considering both of the satellite discrete model and the multi-objective optimization model,a multi-objective heap optimization path selection algorithm is proposed based on priority queue.By the selection of the optimal path from the source satellite node to the destination satellite node,the routing under multi-objective trade-off can be achieved.The simulation results show that the proposed routing scheme can not only reduce the system delay and packet loss rate,but also effectively improve the throughput performance of the system.