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Published September 15, 2004 | Published
Book Section - Chapter Open

Time to go H_∞?

Abstract

Traditionally telescope main axes controllers use a cascaded PI structure. We investigate the benefits and limitations of this and question if better performance can be achieved with modern control techniques. Our interest is mainly to improve disturbance rejection since the tracking performance normally is easy to achieve. Comparison is made to more advanced controller structures using H-infinity design. This type of controller is more complex and needs a mathematical model of the telescope dynamics. We discuss how to obtain this model and also how to reduce it to a more manageable size using state of the art model reduction techniques. As a design example the VLT altitude axis is chosen.

Additional Information

© 2004 Society of Photo-Optical Instrumentation Engineers (SPIE). This research work was supported by the European Southern Observatory (ESO) and Ministry of Education of the Czech Republic under Project LN00B096.

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