An active force control (afc) based control momen gyros for attitude control of small satellite
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Date
2016-09-01
Authors
Mohd Badrul Salleh
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Abstract
A control moment gyroscope (CMG) system is the best option for attitude control system (ACS) design of small satellite for high performance missions due to its high torque amplification. However, the capability of the CMG system with the present of disturbance elements is limited due to the limitation of standard attitude controller to robustly reject these elements whereas the CMG system faces gimbal angle offset problem. In this research, active force control (AFC) is proposed and integrated with the proportional-derivative (PD) controller to command the CMG system to generate suitable control torque for a defined mission whereas magnetic torque gimbal angle compensation (MTGAC) system is integrated into the ACS to compensate gimbal angle offset. All mathematical models were established and implemented in MatlabĀ®-SimulinkTM software. Based on the simulations, the proposed AFC scheme greatly influenced the attitude manoeuvre and attitude pointing performance of the satellite. By selecting suitable AFC parameters, a desirable attitude manoeuvre was achieved and the attitude errors were significantly reduced by more than 60%. Meanwhile, the MTGAC system successfully maintained the CMG gimbals at preferable angle. Moreover, the MGAC system also added an extra degree of freedom to the attitude pointing control when it improved the attitude accuracy as much as 75% without affecting the attitude manoeuvre performance of the satellite. The research findings have been the first that demonstrate the viability of AFC and MTGAC scheme for ACS of small satellite with CMG system which has never been studied before.