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Space Platform Attitude Control System
Abstract
The Space Platform System has completed Phase B preliminary design. The mission intent is to support the shuttle orbiter in a sortie configuration with Power, Communications, Thermal and Attitude Control capability for up to 30 days while supporting payloads within the shuttle bay or mounted directly on the platform. The platform in a free flier mode can support three payload pallets for indefinite periods of time. The attitude control system stabilizes the vehicle against gravity gradient and aerodynamic disturbance torques. The platform size and low earth orbit altitude makes the ACS requirements unique in the need to counteract large aerodynamic disturbances. The Control System design must be compatible with controlling both free fly and sortie configurations, with differing inertias as payload pallets are changed. A preliminary Attitude Control System design has been completed. Actuator sizing and momentum management control laws have been determined consistent with mission requirements and scenerios.
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