Abstract: By applying Lambert algorithm to deal with the constraints of terminal orbit, an optimization model of multiimpulse transfer trajectory is introduced based on the iteration of feasible solutions. Particle swarm optimization is used to optimize the minimumfuel transfer orbit. The true anomaly and instants of impulses are employed as design variables respectively and the corresponding results are compared. The obtained results with respect to the same twoimpulse and threeimpulse orbit transfers  prove the validation and highefficiency of the proposed optimization model and algorithm. The simulation shows that the efficiency is better when the true anomaly of impulses are employed as design variables.

Key words: multiimpulse transfer, particle swarm optimization