Abstract: A finite thrust orbit and attitude control scheme is proposed to solve the problem of unadjustable orbit control thrust with large misalignment for a spacecraft with deviated centroid. The proposed orbit control scheme can control multiple orbit elements at the same time. The problem of unadjustable orbit control thrust is solved by taking the thrust angle as the control input of orbit control. When designing the attitude control strategy to track the desired attitude of orbit control, the large interference torque caused by the thrust misalignment is considered. To solve the problem of large disturbance, the traditional asymptotically stable attitude control law is improved. The coupling relationship of three axis attitude is used to counteract the influence of interference torque. The effectiveness of the orbit and attitude control strategy is verified by numerical simulation.

Key words: integrated orbit and attitude, finite thrust, thrust misalignment, attitude tracking