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dc.contributor.advisorAgrawal, Brij N.
dc.contributor.authorBurtz, Daniel C.
dc.dateMarch 2009
dc.date.accessioned2012-08-22T15:32:23Z
dc.date.available2012-08-22T15:32:23Z
dc.date.issued2009-03
dc.identifier.urihttp://hdl.handle.net/10945/10454
dc.descriptionApproved for public release, distribution unlimiteden_US
dc.description.abstractFuture space telescopes will contain lightweight, flexible, segmented mirrors. Traditional control approaches for mirror alignment and shape control may be inadequate due to flexibilities and low natural frequencies. Using adaptive optics for space telescopes presents a possible solution. This research proposes innovative H[infinity] robust control techniques for these types of systems. An H[infinity] controller is synthesized for a complex analytical model with 997 inputs, 936 outputs, and 332 states. To accomplish this, a new technique for model reduction using Zernike polynomials was developed. The H[infinity] controller was able to achieve a minimum 15 Hz control bandwidth. The previous integral controller was unable to meet the 10 Hz bandwidth requirement. The H[infinity] design process used was validated on a simpler adaptive optics testbed. The experimental verification also showed that the robust control techniques outperformed the classical control techniques in the presence of disturbances. The significant contributions are a Zernike polynomial method for model reduction, robust controller synthesis for a complex adaptive optics analytical model, and experimental verification on an AO testbed. Although the robust control design is more complex, it provides improved performance in the presence of uncertainty in the disturbances and modeling.en_US
dc.description.urihttp://archive.org/details/finesurfacecontr1094510454
dc.format.extentxiv, 99 p. : col. ill. ; 28 cm.en_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.subject.lcshOptics, Adaptive.en_US
dc.titleFine surface control of flexible space mirrors using adaptive optics and robust controlen_US
dc.contributor.departmentAstronautical Engineering
dc.subject.authorRobust controlen_US
dc.subject.authoradaptive opticsen_US
dc.subject.authorsegmented mirrorsen_US
dc.subject.authorShack-Hartmann wavefront sensoren_US
dc.subject.authorspace telescopesen_US
dc.subject.authorH[infinity]en_US
dc.subject.authorflexible structuresen_US
etd.thesisdegree.namePh.D. in Astronautical Engineeringen_US
etd.thesisdegree.levelDoctoralen_US
etd.thesisdegree.disciplineAstronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate School (U.S.)en_US


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