Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Fault Detection of a Spacecraft's Reaction Wheels by Extended Unknown Input Observer

확장형 미지입력 관측기를 이용한 위성 반작용 휠의 고장 검출

  • 진재현 (순천대학교 우주항공공학) ;
  • 용기력 (한국항공우주연구원(KARI) 위성제어팀)
  • Received : 2011.08.20
  • Accepted : 2011.09.25
  • Published : 2011.11.01
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Abstract

This article deals with the problem of fault detection of a spacecraft's actuators. The authors introduce an extended unknown input observer for nonlinear systems. This is an extended form of unknown input observers which are used for linear systems. Since faults are not available, those are considered as unknown inputs. Unknown input observers can estimate states without full information of inputs if some conditions are satisfied. The authors suggest a continuous-time extended UIO (eUIO) and prove the convergence of state estimation errors. Since the dynamic equation of a spacecraft is nonlinear, an extended UIO can be applied. Three eUIOs are designed to monitor three reaction wheels. The moving averages of each eUIO's residuals are selected for decision logic. The proposed method is verified by numerical simulations.

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References

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