طراحي سيستم كنترل وضعيت يك ماهواره متقارن با پايدارسازي گراديان جاذبه اي و چرخش محدود حول محور ياو

Design of Attitude Control System of an Axisymmetric Satellite with Gravity Gradient Stabilization and Slow Spinning about Yaw Axis

In this paper, attitude control system of an axisymmetric satellite will be designed in such a way that required stability is provided with slow spinning about ymv axis. In this regard, dynamic of motion and coupling between satelliteʹs axes is modeled. As a result, a closedformformula is yielded included moment ofinertia ratio, angular velocity about yaw axis and pointing accuracy of control system. Then. magnetic control is designed for providing capture range of gravity gradient stabilization and requirements ofpointing accuracy. Finally, fine performance of designed control system will be illustrated with simulation based on specification ofa near axisymmetric satellite.