Nonlinear singular H/sub /spl infin// suboptimal control for a rigid spacecraft with actuator dynamics

We address a nonlinear singular H/sub /spl infin// suboptimal control problem for a rigid spacecraft with actuator dynamics. Using results from nonlinear H/sub /spl infin// control theory, we find an explicit feedback solution involving the Euler parameters. Our solution is based on a solution to a corresponding nonlinear regular H/sub /spl infin// suboptimal control problem for a rigid spacecraft with three control torques and disturbances.