Problem A of 9th China trajectory optimization competition: Results found at NUAA

Abstract This paper is intended to introduce a method and results of the NUAA team for problem A of the 9th China Trajectory Optimization Competition (CTOC-9). The cluster analysis, leader-follower system and repeat-groundtrack orbit are employed to obtain the solution with excellent performance index. The optimized process is performed in two parts. The first part is to search the monitoring sequence of GEO satellite beams. These beams have been grouped based on their monitoring features before searching, which is the critical factor that makes us in a dominant position. The simplified gains calculation model, which is built based on the leader-follower cluster system, is used to estimate monitoring gains. The second part is the configuration optimization of the monitoring cluster, which is transformed into the trajectory design of the followers because the leader's trajectory has been fixed. Based on the proposed formation configuration strategy, the trajectories of followers are solved by the genetic algorithm. The final result shows that it takes only 20.428 days to complete the mission, which ranks the first place in this competition.

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