基于极点配置和椭球分析的传感器故障检测

This paper proposes a sensor fault detection approach for linear discrete-time system with unknown disturbances and measurement noises. A new linear dynamic system, which is equivalent to the original system, is obtained by considering the fault as an auxiliary state. To make the generated residual robust to disturbances and noises, and sensitive to fault, a fault detection observer is constructed based on the robust observer design and pole assignment techniques. Moreover, a residual evaluation method via ellipsoidal analysis is proposed, which can detect fault by checking whether the residual is included by the fault-free residual ellipsoid. Finally, numerical simulation of a second-order RC circuit model is given to illustrate the effectiveness and superiority of the proposed approach.