Abstract
On geostationary satellite, the main source of attitude disturbance during normal mode is the solar pressure effect on the body, the antennas and the solar arrays. In presence of these disturbances it is necessary, in a momentum biased control system, to maintain the momentum direction perpendicular to the orbit plane (roll/yaw control); as it has been demonstrated in orbit on OTS2, the solar pressure can be used to maintain this orientation.
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