| With the continuous expansion of the application field of navigation satellite networks,the information transmission task between the navigation satellite network and the ground has increased dramatically,and the need to improve the information transmission efficiency between the satellite and the ground has become increasingly urgent.The optimization study of satellite-integrated information transmission can optimize the transmission delay path between the ground station and the satellite carrying the downlink information in the satellite network,and minimize the communication delay cost required for the process of transmitting the data on the satellite to the ground station,thereby improving the information transmission efficiency of the entire satellite network.Considering the stability and autonomous survivability of satellite network operation,the inter-satellite ranging and inter-satellite communication functions of inter-satellite links in satellite networks need to be guaranteed,so that the navigation network can stably provide information transmission services.In this paper,the problem of satelliteintegrated information transmission link planning optimization is studied,mainly by studying the inter-satellite communication function and inter-satellite ranging function of inter-satellite links in satellite networks and between landing satellites and ground stations in satellite networks.The information transmission problem,the specific research content is as follows:(1)Research on the topology and operation process of intersatellite links in navigation satellite networks.Firstly,the mathematical relationship between the satellites in the satellite network is mathematically represented.Then,based on the idea of mathematics,the finite state automaton(FSA)method is used for satellite topology processing.Then the characteristics and chain-building methods of the spot beam directional antenna are introduced in detail.(2)Research on the analysis and mathematical modeling of information integration in satellite and earth.Firstly,the problem of integrated information transmission of satellite and earth is analyzed and the solution is proposed in two parts: the inter-satellite part and the satellite part between the landing satellite and the ground station.Then,the optimization problem with communication delay as the optimization target and the optimal performance of inter-satellite ranging and the relationship between satellites is proposed.(3)Research on optimization algorithm of satellite-integrated information transmission link planning.Aiming at the optimization mathematical model of satelliteintegrated information transmission,an improved genetic algorithm is proposed to optimize the iterative algorithm,and the algorithm is described in detail.(4)Algorithm simulation environment introduction and result analysis.In this paper,the Walker24/3/2 constellation is used for research,and the visibility information calculated in STK is used to solve the algorithm,and the calculation results and conclusions are listed.Then,the selection method of the landing relay satellite is proposed.The simulation results show that the proposed algorithm based on the improved genetic algorithm based on the improved genetic algorithm can solve the average communication experiment cost in the case of different time slots.And through the STK analysis of the Walker24/3/2 constellation,the landing satellite selection table is obtained,and the satellite with a large proportion of visible time is preferentially selected as the landing satellite. |
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