Abstract
This paper describes design considerations for the antenna pointing control system in ETS-VI. The satellite flexible structures including a 3.5-m main-reflector, a sub-reflector with an antenna pointing mechanism, and large solar paddles were modelled mathematically.The interactions between the satellite main body and antenna reflectors were estimated, and the structural model for application to control design was modified based on the results. By analizing the sensitivities of the control system parameters, it was clarified that the gain change of the control loop must be increased by about 3.6 dB taking the structural parameter variations into consideration.
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