Key Technology Research On Spatial Information Network Resource Scheduling

The Space Information Network is a three-dimensional mesh network,consisting of Satellite, which is the center of the Network, Information Platform(Ground Control Center, Spacecraft, and Vehicle), and Terminal.The satellite in the network is usually be modeled as MEO-LEO Satellitemodel: the MEO (Medium Earth Orbit) Satellites make up the backbone network,which is used as the relay satellite; the LEO (Low Earth Orbit) Satellites buildup the user satellites, which communicate with the Information Platform andTerminal to collect the task, and it need the MEO to transmit these tasks toanother LEO satellite, at last, the LEO will transmit the task to the destinations.This paper is proposed to research the schedule strategy about how therelay MEO to transmit these tasks from an LEO to another LEO and to maximizethe profit of all of the tasks. We will first build up an MEO/LEO model,consisting of4MEO satellites and18LEO satellites by using the STK (SatelliteTool Kit) software. Then we try to analyze the capacity of the MEO/LEO modelby analyzing the dynamic flow rate of the network. Then we consider the taskschedule strategy for the MEO satellites. We have research the schedule modeland some new idea is brought up based on the previous model: to redefine thenonlinear profit function of a task to make it more precise, to improve theapplication sense to make it more realistic. We have also described the scheduleproblem for the MEO/LEO model, using the AMPL. At last, we solve theschedule problem by using the cplex solver and gurobi solver. The result can beused as the reference for the realistic schedule problem.