Abstract
This work deals with the design of an attitude-control system for a scientific mission which performs astrometric measures by the use of an optical strapdown telescope. The optical system requires a very low vibration level and a high pointing accuracy. This task is performed by a control loop which can filter the noise and assure a smoothed motion to the S/C in order to follow any path in the sky without losing star signals. A further improvement is obtained by optimising the observation procedure and sampling time. By the analytical treatment and the simulations performed, results show that the jitter level of the system is lower than that allowed, and the dynamical motion of the S/C is satisfactory.
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