Attitude Maneuver Control of Spacecraft with Pointing Constraints Considering Unknown Input Saturation.

A novel control algorithm based on the navigation function of line-of-sight and backstepping method is presented in this paper for spacecraft maneuver under pointing constraints and input saturation constraint. The navigation function of line-of sight is constructed on the unit sphere, and thereafter is used to design the backstepping controller. With the assistance of auxiliary system, a controller is obtained. The controller can not only satify pointing constraints, but also meet input saturation constraint, meanwhile the constant disturbance can be estimated and be suppressed. The simulation results validate the effectiveness of the proposed algorithm. [ABSTRACT FROM AUTHOR]