Accession Number : ADA258839


Title :   Optimal Control of the Starfire Beam Director


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Lanier, Troy V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258839.pdf


Report Date : Dec 1992


Pagination or Media Count : 125


Abstract : The Starfire Beam Director (SBD) is located at the Starfire Optical Range at Kirtland Air Force Base in Albuquerque, New Mexico. The SBD capabilities include tracking celestial objects and active or passive tracking of artificial satellites to support the Phillips Laboratory Ground Based Laser Acquisition, Tracking, and Pointing (GBL ATP) program. The pointing and tracking accuracy needed to support such experiments is micron rad to sub-grad level. To accomplish this goal requires precise pointing of the massive 6 ton 1 -meter clear aperture coelostat. The purpose of this thesis is to use optimal control design techniques to develop a controller to meet the stringent pointing requirements. A nominal linear state-space model was built which included gimbal dynamics, plant disturbances, and sensor noise. Then optimal control design techniques were used to develop unity feedback and two degree of freedom controllers. The various controllers were simulated with the coelostat truth model, which incorporated the higher frequency control loop and motor dynamics, nonlinearities, plant disturbances, sensor noise, and discrete control effects. The best of the designs, the H2 unity feedback controller, was compared and contrasted with the performance of the controller currently being used, which was obtained by classical control design. The H2 controller exceeded tracking requirements and in most areas performed better than the current controller.


Descriptors :   *OPTICAL TRACKING , FREQUENCY , CONTROL , REQUIREMENTS , AIR FORCE , OPTIMIZATION , ACQUISITION , MODELS , DYNAMICS , TRACKING , ACCURACY , THESES , LASERS , FEEDBACK , ARTIFICIAL SATELLITES , NEW MEXICO , NOISE , GROUND BASED , COELOSTATS , ADENOSINE PHOSPHATES , GIMBALS , LOOPS , MOTORS , APERTURES


Subject Categories : Lasers and Masers
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE