Fault diagnosis of spacecraft attitude control system based on dual-strong tracking square-root cubature Kalman filter

In order to improve the reliability of the spacecraft system, a fault estimation method based on the dual multiple fading factors strong tracking square-root cubature Kalman filter (Daul-ST-SRCKF) is proposed for the problem of actuator fault diagnosis under the influence of external interference in the spacecraft attitude control system. To ensure the safety and reliability of the spacecraft. First, establish a spacecraft attitude dynamics model considering actuator fault and external disturbance; then, design a ST-SRCKF to observe the states of the system, total disturbance signals to realize the disturbance compensation for another filter system model. And another ST-SRCKF estimate fault information, two filters can exchange parameters to form a Daul-ST-SRCKF; Finally, Simulation results show that this method can quickly and accurately identify fault information and complete health assessment under the presence of internal and external disturbances.