Fault-tolerant Cooperative Control for Earth Observation Satellite Formation with Attitude-orbit Coupling
Considering the attitude and orbit coupling characteristics and total failure of satellite formation in the Earth observation scenarios,a fault-tolerant cooperative control method based on spatial configuration reconstruction is proposed.Firstly,according to the requirements of the Earth observation,the satellite formation configuration in fault-free case,and the configuration reconstruction scheme including topology reconfiguration,satellite number updating and attitude and orbit reconfiguration algorithm after removing the faulty satellites are established respectively.Secondly,according to the above configuration,considering disturbance and attitude-orbit coupling characteristics,a distributed control law based on nonsingular terminal sliding mode control is designed,which guarantees the finite-time stability of the system,such that the satellite formation can cover the observing area before and after failure.Finally,the effectiveness of the proposed method is demonstrated by numerical simulation and experimental verification.
Earth observation satelliteFormation controlAttitude and orbit controlDistributed controlFault-tolerant cooperative control
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