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Robust detection and isolation of failures in satellite attitude sensors and gyro

Published online by Cambridge University Press:  12 January 2012

Bahar Ahmadi
Affiliation:
Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran
Mehrzad Namvar*
Affiliation:
Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran
*
*Corresponding author. E-mail: namvar@sharif.ir

Summary

Reliability of a satellite attitude control system depends on accurate detection of failures in its sensors. This paper presents an observer for robust detection and isolation of a class of failures in satellite attitude sensors. The proposed observer uses measurement of a three-axis gyro together with only one attitude sensor, and generates a residual signal which is sensitive to faults and is simultaneously robust against disturbance and noise. A nonlinear model of satellite kinematics is considered for design of the observer. The structure of the observer is in the form of a delayed continuous-time differential equation ensuring its robustness properties. A realistic simulation is provided to illustrate the performance of the proposed observer in the face of the faults occurring in a magnetometer, as the attitude sensor, and also the faults occurring in the gyro.

Type
Articles
Copyright
Copyright © Cambridge University Press 2012

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