0383283 20240111140822.420121119235959.9 8 s. Internet cav_un_epca*03734582223-703813 (2012)179-187Rossiiskaya Akademiya Nauk Attitude control adaptive fault estimation LMI PDF cav_un_auth*0284758 Nguyen H.Q. CZ cav_un_auth*0101074 Čelikovský Sergej Teorie řízení Department of Control Theory TŘ TR UTIA-B Department of Control Theory Ústav teorie informace a automatizace AV ČR, v. v. i. dokument http://lib.physcon.ru/doc?id=02c925f7e4ab 255 kB GAP103/12/1794 GA ČR CZ cav_un_auth*0283207 This paper studies the problem of the fault estimation for a class of time-varying faults using output probability density function (PDF). In particular, the spacecraft control system is studied. First, the attitude control of the nonlinear model with uncertainties is given. Then, the measured output is viewed as a stochastic process and its PDF is modeled, which leads to a deterministic dynamical model including nonlinearities and uncertainties. A new adaptive fault diagnosis algorithm is proposed to improve the performance of the fault estimation. The proposed algorithm contains both the proportional and the integral term. The proportional term can improve the speed of the fault estimation, while the integral term can eliminate estimation error. Then, based on the linear matrix inequality (LMI) technique, a feasible algorithm is explored to find the designed parameters. Finally, simulation results of the spacecraft are given to show the efficiency of the proposed approach. 2013 BC 2 RVO:67985556 http://hdl.handle.net/11104/0213271 2012 dokument 255 kB cav_un_epca*0373458 Cybernetics and Physics 2223-7038 Roč. 1 č. 3 2012 179 187 Rossiiskaya Akademiya Nauk