ADAPTIVE ASYMPTOTIC TRACKING OF SPACECRAFT ATTITUDE MOTION WITH INERTIA MATRIX IDENTIFICATION

The problem of a spacecraft tracking a desired trajectory is defined a nd addressed using adaptive feedback control. The control law, which h as the form of a sixth-order dynamic compensator, does not require kno wledge of the inertia or center of mass of the spacecraft. A Lyapunov argument is used to show that tracking is achieved globally. A simple spin about the intermediate principal axis and a coning motion are com manded to illustrate the control algorithm. Finally, periodic commands are used to identify the inertia matrix of the spacecraft.