<h2>AAS 97-170</h2>
<h2>LEQG AND GAME THEORETIC SATELLITE ATTITUDE CONTROL WITH  MAGNETIC TORQUER                                                                        </h2>
<h4> C-H Won, Electronics & Telecommunications Research Institute, Korea                                                                                                      </h4>
<h2> Abstract </h2>
 An effective way to control a satellite's attitude is to use magnetic torque  control to handle two different disturbances:  the external disturbance torque due  to such factors as aerodynamic drag, gravity gradient, and solar radiation  pressure; and the disturbance caused by the uncertainties in parameters such as  moment of inertia, control parameters and magnetic field variation.  In this paper,  we propose to use two different ways to model these disturbances, and use two  distinct robust control strategies for each model.  These control strategies are  Risk-Sensitive control, a generalization of the Linear Quadratic Gaussian control,  and the Game Theoretic control.