Prof. Bong Wie
Attitude Control System Redesign for the Hubble Space Telescope
Attitude control system redesign problem of the Hubble Space Telescope (HST) for reducing the effect of solar array thermal vibrations on telescope pointing jitter is discussed. Both classical and modern control design techniques are employed for the precision pointing control design problem of the HST. A cyclic disturbance rejection control concept is shown to be very effective and practical for precision line-of-sight pointing control in the presence of significant structural thermal vibrations. Redesigned controllers effectively reduce the effect of the solar array induced disturbances at 0.12 Hz and 0.66 Hz pointing jitter.