FAULT TOLERANT ATTITUDE CONTROL DURING FORMATION FLYING

The authors propose an adaptive fuzzy terminal sliding mode control algorithm (AFTSMC) for attitude tracking of multiple picosatellites during formation flying. The relative attitude of the leader and follower picosatellites under gravity gradient torque and external periodic disturbances is controlled by four reaction wheels. This method can accommodate faults rapidly without controller reconfiguration. The numerical simulations (under the fault and failure of wheel) demonstrate the effectiveness of the proposed controllers.