Model-based FDI for Agile Spacecraft with Multiple Actuators Working Simultaneously

E. Lopez-Encarnacion, R. Fonod, P. Bergner

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Fast and large-angle attitude slew maneuvers often imply simultaneous use of multiple actuators such as thrusters and reaction wheels (RWs). A fault in any of these actuators might lead to partial or full damage of sensitive spacecraft instruments. In this paper, a model-based Fault Detection and Isolation (FDI) strategy is proposed, which aims at detecting various actuator faults, such as stuck-open/closed thruster, thruster leakage, loss of effectiveness of all thrusters, and change of RW friction torque due to change of Coulomb and/or viscosity factor. The proposed FDI strategy is also able to detect and isolate faults affecting the RWs tachometer sensor. The FDI system design is based on a multiplicative extended Kalman filter and a generalized likelihood ratio thresholding of the residual signals. The performance and robustness of the proposed FDI strategy is evaluated using Monte Carlo simulations and carefully defined FDI performance indices. Preliminary results suggest promising performance in terms of detection/isolation times, miss-detection/isolation rates, and false alarm rates.
Original languageEnglish
Title of host publication21st IFAC Symposium on Automatic Control in Aerospace
Place of Publication Cranfield, UK
Number of pages6
Publication statusPublished - 25 Nov 2019
Event21st IFAC Symposium on Automatic Control in Aerospace - Cranfield University, Cranfield, United Kingdom
Duration: 27 Aug 201930 Aug 2019
Conference number: 21

Publication series

ISSN (Print)2405-8963
ISSN (Electronic)2405-8963


Conference21st IFAC Symposium on Automatic Control in Aerospace
Abbreviated titleACA
CountryUnited Kingdom
Internet address


  • Fault Detection and Isolation
  • Agile Spacecraft
  • Reaction Wheels
  • Thrusters

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