基于偏差分离原理的卫星执行机构故障诊断

Fault diagnosis of satellite actuator based on bias-separated theory

提出一种同时估计输入时滞和控制输入故障的方法。首先,基于偏差分离的思想,分别建立含有输入时滞和控制输入故障的一般控制系统与卫星姿态控制系统的数学模型。其次,基于二阶Kalman滤波对控制输入故障以及输入时滞进行估计。最后,对所提出的方法进行了数学仿真验证,特别地,基于"快舟一号"卫星控制系统半物理仿真平台进行了半物理仿真验证,证明了方法的可行性和有效性。

An estimation method of input delay and control input fault is proposed. At first, based on the bias-separated theory, a normal control system model and a satellite attitude control system model with input delay and control input fault are set up respectively. Then, the input delay and control input fault can be estimated by the two-stage Kaman filter. Finally, the simulation of the method in a satellite attitude control system with actuator fault and input time delay illustrates the effectiveness of the proposed approach. Mathematical simulation and a real-time simulation based on the ＂KUAIZHOU-1＂ satellite control system hardware-in-the loop simulation platform are performed to validate that the method is suitable and effective respectively.