微小卫星姿态控制系统鲁棒自适应故障估计

摘要

针对具有非结构不确定项的非线性系统中存在的执行器与传感器故障，采用一种基于描述系统的故障估计观测器设计方法。该方法具有期望的鲁棒性能指标，能够在系统存在不确定项干扰的情况下实现对突变故障与时变故障等故障类型的精确估计。根据Lyapunov稳定性理论推导了上述方法存在的充分条件，根据线性化算法把上述充分条件转变为准线性矩阵不等式，应用迭代优化算法求得该充分条件的可行解。最后，将该方法应用于微小卫星姿态控制系统中执行器与传感器故障估计，仿真结果证明了该方法的有效性。%This paper using a fault estimation observer design method based on described system, which is subjec⁃ted to actuator faults and sensor faults in nonlinear systems with unstructured uncertainties. The method has the de⁃sired robust performance index, and in the presence of uncertainties, it can achieve accurate reconstructions of ab⁃rupt faults and time⁃varying faults, etc. Sufficient conditions for the existence of the proposed observer have been derived based on Lyapunov stability theory, and then converted into quasi⁃convex Linear Matrix Inequalities( LMIs) by using the cone complementarily linearization ( CCL) algorithm, consecutively using iterative algorithm to get the feasibility solutions. Finally, the performance of the fault estimation scheme derived here is evaluated extensively through applying this method into microsatellite attitude dynamics, which can effectively estimates the actuator faults and sensor faults.