Abstract: Focusing on the requirement of onorbitservicing spacecraft to targeter in eccentric orbits, the initial conditions for the chaser flying around the targeter and the optimal control algorithm used to keep the flyaround orbit under perturbance were presented. With detailed analyzing the time variant and relatively linearized formulas and their analytic solutions, the necessary conditions for the chaser flyaround were acquired. To consider the safety, the conditions for the targeter to locate at the center of flyaround orbit and its design under given chaser shape and distance were presented. In view of the influence of perturbance, a discrete LQR optimal controller with constraint control vector to keep the chaser in the scheduled orbit was designed. Three control error boxes enabling the controller to work in the reasonable error areas to avoid fuel wastage for the error measure were also allocated. An example design was validated successfully by a simulation.

Key words: aerocraft design, onorbitservicing, orbit design, optimal control