Research on fault detection for satellite attitude control systems based on sliding mode observers

This paper investigates the design and application of a sliding mode observer (SMO) strategy for fault detection problem for satellite attitude control systems. A particular design of sliding mode observer is presented for which the parameters can be obtained by a linear change of coordinates under some conditions. Instead of generating residuals for other observer-based fault detection methods, the sliding mode observer discussed is designed based on the so-called equivalent output estimation error injection concept to reconstruct the faults. Both the actuator and sensor fault detection and reconstruct for satellite attitude control systems are taken into account. A mathematical simulation is given to illustrate the effectiveness of the proposed approach.