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Control systems of the large millimeter telescope

Show simple item record Gawronski, Wodek K. Souccar, Kainal 2006-01-27T18:25:54Z 2006-01-27T18:25:54Z 2004-06-21
dc.identifier.citation SPIE Astonomical Telescopes and Instrumentation, American Institute of Aeronautics and Astronautics, Glasgow, UK, June 21, 2004 en
dc.identifier.clearanceno 04-0936
dc.description.abstract The paper presents the analysis results (in terms of settling time, bandwidth, and servo error in wind disturbances) of four control systems designed for the Large Millimeter Telescope (LMT). The first system, called PI’, consists of the proportional and integral (PI) controllers in the rate and position loops, and is widely used in the antenna and radiotelescope industry. The analysis shows that the PP control system performance is remarkably good when compared to similar control systems applied to typical antennas. This performance is achieved because the LMT structure is exceptionally rigid, however, it does not meet the stringent LMT pointing requirements. The second system, called PL, consists of the PI controller in the rate loop, and the Linear-Quadratic-Gaussian (LQG) controller in the position loop. This type of controller is implemented in the NASA Deep Space Network antennas, where pointing accuracy is twice that of PP control system. The third system, called LP, consists of the LQG controller in the rate loop, and the propositional-integral-derivative (PID) controller in the position loop. This type of loop has not been yet implemented at known antennas or radiotelescopes, but the analysis shows that its pointing accuracy is the ten times better than PP control system. The fourth system, called LL, consists of the LQG controller in both the rate loop, and the position loop. It is the best of the four, with accuracy 250 better than the PP system, thus is worth further investigations, to identify implementation challenges for the telescopes of high pointing requirements. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 2451455 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004 en
dc.subject control systems en
dc.subject antennas en
dc.title Control systems of the large millimeter telescope en
dc.type Preprint en

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