13 October 2010 High-precision scanner control system
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A high-precision whiskbroom scanner control system, which is used on earth observation satellites, is discussed. This control system is required to keep high angular precision with ultra-smooth rotation. We designed a feedback control system consisting of a rate loop for rotation-speed control and a position loop for angular control. Adding a feedforward control system using cyclic memory, 1st order rotational synchronizing disturbance caused by eccentric load has been compressed over 50 dB. As a result, high pointing accuracy with a standard deviation of 0.003 degree or less has been achieved in rotating with a constant speed of 79.4 rpm.
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Y. Yanagita, Y. Yanagita, K. Aoki, K. Aoki, T. Kurii, T. Kurii, } "High-precision scanner control system", Proc. SPIE 7826, Sensors, Systems, and Next-Generation Satellites XIV, 78261E (13 October 2010); doi: 10.1117/12.864676; https://doi.org/10.1117/12.864676

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