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School of Astronautics, Harbin Institute of Technology, No.2 Yikuang Street, Nangang District, Harbin 150080, China



These authors contributed equally to this work.





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Academic Editor: Vittorio M. N. Passaro

Abstract A gyrowheel GW is a kind of electronic electric-mechanical servo system, which can be applied to a spacecraft attitude control system ACS as both an actuator and a sensor simultaneously. In order to solve the problem of two-dimensional spacecraft angular rate sensing as a GW outputting three-dimensional control torque, this paper proposed a method of an extended high gain observer EHGO with the derived GW mathematical model to implement the spacecraft angular rate estimation when the GW rotor is working at large angles. For this purpose, the GW dynamic equation is firstly derived with the second kind Lagrange method, and the relationship between the measurable and unmeasurable variables is built. Then, the EHGO is designed to estimate and calculate spacecraft angular rates with the GW, and the stability of the designed EHGO is proven by the Lyapunov function. Moreover, considering the engineering application, the effect of measurement noise in the tilt angle sensors on the estimation accuracy of the EHGO is analyzed. Finally, the numerical simulation is performed to illustrate the validity of the method proposed in this paper. View Full-Text

Keywords: gyrowheel; angular rates estimation; torque output; extended high gain observer; Lyapunov stability; measurement noise gyrowheel; angular rates estimation; torque output; extended high gain observer; Lyapunov stability; measurement noise





Autor: Xiaokun Liu †,* , Yu Yao †, Kemao Ma †, Hui Zhao † and Fenghua He †

Fuente: http://mdpi.com/



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