Job Scheduling And Simulation Of On-Orbit Service Network Based On Space Servicing Station

On-orbit servicing is the most important technology for countries to support their space industry,which has a broad prospect for future on-orbit lifetime extension,assembly,cleaning up space junk.There must be a scheduling problem with wide applications of on-orbit servicing.This dissertation focuses on the SSO satellites and makes research on the on-orbit servicing scheduling problem.The basic orbital dynamics used is reviewed,and introduce the mean elements method used to predict the orbit and the solution of Lambert problem based on the J2 perturbation.The orbit maneuver scheme between the SSO satellites is studied when the angle between the two SSO planes is small.The start time and time of orbital maneuver are taken as the optimization variables,and the velocity increment is taken as the optimization goal.The search area is identified through the study of SSO satellites’ characteristics,and solve the maneuver problem by GA.On this basis,the fast calculation method is obtained by the relationship between the minimum velocity increment and the angle between the SSO satellites.Then take the case of SSO satellites whose span of RAAN is small,the research of mission scheduling of on-orbit rendezvous replenishment service and fly by observation service is studied.And the scheduling and optimization model is built.The service sequence,detailed parameters of service stages are obtained through the joint simulation on the MATLAB and STK by GA and SA.In addition,the maneuver scheduling of multiple stages for the maneuver problem between SSO satellites whose difference of RAAN is large can be obtained.The angle between the orbital planes is reduced by the different influences of J2 perturbation focus on the satellite at different altitudes.It is found that the calculation time of the fast solution method is much less than the former by using the genetic algorithm and fast solution method to solve the same orbital change process.In addition,the simulation results show that the math model and algorithm can be used to the mission scheduling optimization problem of on-orbit rendezvous replenishment service and fly by observation service.And the maneuver scheduling of multiple stages can reduce the consumption of fuel of orbital maneuver when the difference of SSO satellites’ RAAN is large.