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A new set of relative orbit elements (ROEs) is used to derive a new analytical optimal formation control strategy. The control of in-plane and out-of-plane relative motions can be completely decoupled using the ROEs-based impulsive feedback control law. The effects of the earth gravity harmonics perturbation (mainly J2) on the relative orbit are derived. Subsequently a formation optimal control approach...
To design the more accurate trajectory of a soft lunar landing, the constraints on the powered descent sub-phase, such as a breaking phase, an approach phase, a terminal descent phase, have to be considered. In this paper, the trajectory optimization of the lunar landing was performed considering constraints on the sub-phase of the powered descent phase. To convert the optimal control problem, the...
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