ROBUST FAULT DIAGNOSIS OF THE MICROSCOPE SATELLITE MICRO-THRUSTERS

This paper addresses the fault diagnosis task of the satellite Microscope actuators. The considered faults are the Field Emission Electric Propulsion (FEEP) thrusters faults occurring when a thruster blocks itself or closes itself during operating. The proposed diagnosis scheme is based on the non-conservative residual generation scheme proposed in (Henry and Zolghadri, 2005 a) for LTI uncertain systems under feedback control, combined with a post-residual auto-piloted filter. The proposed scheme is optimal in the sense that the effects that thrusters faults have on the residuals is maximized and the influence of both spatial disturbances and sensor noises, minimized, in the H∞/H_-norm sense.