Acquisition, Tracking and Pointing Control of the Bifocal Relay Mirror Spacecraft
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This paper presents the results of both numerical and experimental studies on the guidance, dynamics and control of the Bifocal Relay Mirror spacecraft. This proposed spacecraft consists of two large gimbaled telescopes, that are optically coupled and used to redirect a laser beam from a ground-based source to a distant point. The attitude control system consists of reaction wheels, star trackers and gyros. The optical control system consists of fast steering mirrors and optical tracker sensors. The very tight pointing and jitter requirements, together with the multi-body nature of the spacecraft, make the control of the system very challenging. Numerical simulations have been performed on a complete analytical model of the system dynamics, in order to compare two different control approaches proposed for the attitude and trackingpointing. Moreover experiments were carried out on a spacecraft simulator test-bed, modelling the transmitter portion of the Bifocal Relay Mirror spacecraft. The main tasks of the presented experiments were first, to validate the attitude stabilization control together with the target acquisition-tracking-pointing and laser jitter rejection second, to prove the effectiveness of the test-bed Itself as an Important tool to be used In the following research.
- Unmanned Spacecraft
- Human Factors Engineering and Man Machine Systems