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In-flight position calibration of the Cassini articulated reaction wheel assembly

Show simple item record Brown, Todd S. 2015-03-11T23:22:41Z 2015-03-11T23:22:41Z 2012-08-13
dc.identifier.citation AIAA Guidance, Navigation, and Control Conference and Co-located Conferences, Minneapolis, Minnesota, August 13-16, 2012 en_US
dc.identifier.clearanceno 12-2807
dc.description.abstract NASA’s long-lived Cassini-Huygens spacecraft is currently in its 14th year of flight and in the midst of its second, and final, extended mission. Cassini is a massive interplanetary spacecraft that is three axis stabilized and can maintain attitude control using either its reaction control system thrusters or using reaction wheel control. Cassini has four identical reaction wheels, of which three are mutually orthogonal and have a fixed orientation. The fourth reaction wheel has an articulation motor that allows this reaction wheel to be aligned with the momentum direction of any of the other three fixed reaction wheels. The articulation motor allows this reaction wheel to be used as a replacement for any of the other three wheels without any performance degradation. However, due to limitations in the design of this backup system, there are few telemetric indications of the orientation of this reaction wheel following an articulation. This investigation serves to outline the procedures that have been developed by the Cassini Attitude and Articulation Control Subsystem to calibrate the position of the articulated reaction wheel assembly in the event that the momentum direction of this reaction wheel must be reoriented. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012 en_US
dc.title In-flight position calibration of the Cassini articulated reaction wheel assembly en_US
dc.type Preprint en_US

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