Abstract: In order to solve the problem of space avoidance of GEO service satellites, a space avoidance strategy for GEO satellites based on collision probability optimization is proposed. The stationkeeping model under pulse thrust control is established, and then the assumptions and calculation principles of the collision probability are explained, and then the original collision probability calculation method is improved for GEO satellites, and a collision probability calculation method considering the velocity error is proposed. With the pulse velocity as variable, the minimum impulse and collision probability as optimization objectives, NSGAⅡ based multi-objective optimization is carried out to obtain the Pareto optimal solution for the problem with high collision probability. Considering the service requirements of GEO satellites, the space avoidance strategies that meet the accuracy of the GEO satellites are obtained, and the effectiveness of the space avoidance strategies is verified by simulation, and the research results can provide a reference for the space avoidance methods under the condition that the on-orbit service satellites meet the requirements of the stationkeeping.

Key words: GEO satellites, collision probability, multi-objective genetic algorithm, stationkeeping, space avoidance