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30 September 2004 Control modes of the ST7 disturbance reduction system flight validation experiment
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The Space Technology 7 (ST7) experiment will perform an on-orbit system-level validation of two specific Disturbance Reduction System technologies: a gravitational reference sensor employing a free-floating test mass and a set of micronewton colloidal thrusters. The ST7 Disturbance Reduction System (DRS) is designed to maintain the spacecraft's position with respect to a free-floating test mass to less than 10 nm/√Hz over the frequency range of 1 to 30 mHz. This paper presents the overall design and analysis of the spacecraft drag-free and attitude controllers. These controllers close the loop between the gravitational sensors and the micronewton colloidal thrusters. There are five control modes in the operation of the ST7 DRS, starting with the attitude-only mode and leading to the science mode. The design and analysis of each of the control modes as well as the mode transition strategy are presented.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peiman G. Maghami, Oscar C. Hsu, F. Landis Markley, and James R. O'Donnell Jr. "Control modes of the ST7 disturbance reduction system flight validation experiment", Proc. SPIE 5528, Space Systems Engineering and Optical Alignment Mechanisms, (30 September 2004);

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