In this paper a new design method for a gain scheduling controller is described which will be employed in an on-orbit control experiment using Engineering Test Satellite VIII. Using this method, a robust control system that is resilient to changes in the paddle rotation angle and higher order vibration modes is designed as this method can treat the satellite system as a linear parameter varying (LPV) system whose dynamics vary according to the paddle rotation angle. The derived gains can be easily scheduled since the scheduling law consists of small number of grid points and requires just linear interpolation calculation. Using this method, stability and performance are guaranteed at each parameter value (paddle angle in this case). Some simulation results are provided to show the effectiveness of our controller.