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Proceedings Paper

Performance analysis of the GOES trim tab solar pressure torque angular momentum control
Author(s): Edwin Harvie III; John Rowe; Yo-Kung J. Tsui
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Paper Abstract

The GOES I/M series of geostationary weather satellites are 3-axis stabilized and incorporate an optical trim surface, or 'trim tab', to balance solar radiation pressure torque between the south moment arm, formed by a single solar array, and the north moment arm, formed by a solar sail on an extended boom. This design minimizes the need for active roll/yaw momentum management from thrusters or magnetic dipoles and provides margin for uncertainties and changes such as center of mass shift and degradation of surface optical properties. The trim tab has one rotational degree of freedom and is actuated vie open loop ground command to a motor on the rotation axis. Normal operational procedure is to command a small incremental trim tab slew daily to track the change in north/south solar radiation pressure torque with Sun declination. Proper management of the trim tab is critical to spacecraft roll/yaw pointing performance and the open loop design of the system requires sophisticated ground based algorithms to determine trim tab position error and developed a daily commanding profile. Flight experience with the GOES-8 and GOES-9 spacecraft has proven the feasibility of the trim tab design and has led to refinement of the ground based trim tab analysis algorithm. THis paper summarizes the performance of the trim tab roll/yaw momentum control system and describes analysis methods developed by the GOES mission operations team to support trim tab operations.

Paper Details

Date Published: 18 October 1996
PDF: 12 pages
Proc. SPIE 2812, GOES-8 and Beyond, (18 October 1996); doi: 10.1117/12.254119
Show Author Affiliations
Edwin Harvie III, Computer Sciences Corp. (United States)
John Rowe, Computer Sciences Corp. (United States)
Yo-Kung J. Tsui, Lockheed Martin Corp. (United States)

Published in SPIE Proceedings Vol. 2812:
GOES-8 and Beyond
Edward R. Washwell, Editor(s)

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