Classical and robust H infinity control redesign for the Hubble Space Telescope

A control redesign problem of the Hubble Space Telescope (HST) for reducing the effects of solar array vibrations on telescope pointing jitter is investigated. Both classical and H infinity control design methodologies are employed for such a control problem with a non-colocated actuator and sensor pair. This pair successfully demonstrates the effectiveness of a dipole concept for precision line-of-sight pointing control in the presence of significant stuctural vibrations. Proposed controllers with two dipoles effectively reduce the effects of the solar array induced disturbances at 0.12 Hz and 0.66 Hz on pointing jitter.