Document Type : Research Article

Authors

1 Ph.D. Student, Space Thrusters Research Institute, Iranian Space Research Center, Tabriz, Iran

2 Assistant Professor, Space Thrusters Research Institute, Iranian Space Research Center, Tabriz, Iran

Abstract

In this article, a robust model predictive controller is designed for maintaining the satellite's orbit in the low earth orbit. The designed control system makes it possible for the satellite to automatically keep the orbital parameters within the allowed range without the intervention of the ground station. For this purpose, Hall effect thrusters, which are among the electric thrusters with small size, have been used, and the output of the controller is implemented by continuously commanding these actuators instead of the traditional impulsive thrust generation algorithms. Based on this, it is possible to modify all orbital parameters simultaneously. In the presented solution, the gain of the controller is calculated online by solving an optimization problem whose cost function is to minimize the orbit maintenance error and also the fuel consumption. Also, some constraints are included in the optimization problem that developed in the form of linear matrix inequalities to ensure the stability of the closed loop system and robustness against unknown orbital perturbations. Finally, the numerical simulations show the effectiveness of the proposed control scheme and the high efficiency of the closed loop system despite uncertainties and disturbances.

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