KEYWORDS: Control systems, Servomechanisms, Dielectrophoresis, Telescopes, Control systems design, Computer programming, Satellites, Clocks, Digital signal processing, Sensors
The design of a new, all-digital control system for sub-arc second satellite tracking is described. This design is currently being reduced to practice for a large ground-based tracking telescope. Topics discussed include selection of overall control system architecture, the use of auxiliary inertial feedback elements for jitter reduction, sensor noise characterization, selection of bandwidth, hardware selection, and performance prediction. Experimental work is being conducted to support the development of this control system on a Contraves KINETO tracking system. A comparison of results (primarily tracking jitter and pointing accuracy) between a standard KINETO and the new control system is provided, as well as extrapolation of these results to the final system.
A 1-kHz control system for precision position control of a two-axis gimballed mirror is presented. The control system is unique in that it uses the state estimator's position estimates to excite the Inductosyn position transducers. Also presented is a concise algorithm for proximate time optimum control within available motor torque (or alternatively, maximum gimbal acceleration) and maximum allowable gimbal rate. The newly developed Inductosyn excitation/reduction scheme and proximate time optimum algorithm are successfully demonstrated on hardware designed, constructed, and tested by Contraves USA, where accuracies better than 4 arc seconds were measured.
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