Abstract
The performance of the M-V rocket attitude control has been validated by the flight results obtained at the first launch of its renewed version, which was successfully conducted in May 2003 to inject Japan's first asteroid sample returner “HAYABUSA” into the planned inter-planetary orbit. The μ-synthesis was applied for the first time ever to the design beyond the reliable H∞ control to get better robust characteristics against uncertainties of the system parameters as well as precise tracking performance under the limited rigidity. As the plant dynamics has an extremely high order and unstable character, the standard μ-synthesis cannot be directly applied, thus, the standard procedure is modified in a special way in order to make the approach more efficient.
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