Attitude coordination control of spacecraft formation flying with bounded control inputs

In this paper we consider attitude coordination control problem of spacecraft formation flying. Two coordinated attitude tracking control schemes subject to control input constraints are addressed here. We first present the full-state feedback control scheme that allows each spacecraft to align their attitude and track the desired trajectory. Then the output feedback control schemes are given without the requirement of absolute angular velocity measurements and relative angular velocity measurements between neighboring spacecrafts. By introducing bounded functions we can get the desired bounds on the control torques. Simulation results of a scenario of six spacecrafts are provided to show the effectiveness of the proposed attitude coordination control schemes.