Cubesat Tracking Control Using Sliding Mode Controller and Fuzzy Sliding Mode Controller


Silahtar O., Atan Ö.

1st International Future Engineering Conference, Şırnak, Turkey, 25 - 26 December 2023, pp.71

  • Publication Type: Conference Paper / Summary Text
  • City: Şırnak
  • Country: Turkey
  • Page Numbers: pp.71
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

In this study, a sliding fuzzy controller (FSMC) was designed to track the position of two cube satellites moving in the Line of Sight (LOS) coordinate plane. For this purpose, the dynamic models of two CubeSat defined as chaser and non-cooperative target were obtained in the LOS coordinate plane. Then, firstly, Lyapunov criteria were applied and a sliding mode controller (SMC) design was made to ensure the stability of the system. Since the chased target CubeSat was a non-cooperative target, the control process was applied only to the chaser CubeSat. Then, the system was simulated with the MATLAB/Simulink program and efficiency criteria such as settling time, steady-state error and maximum overshoot were obtained. This time, a designed fuzzy sliding mode controller (FSMC) was applied to the same system under the same initial conditions. Efficiency criteria obtained from FSMC were compared with the system under SMC. Accordingly, although both systems reached stability in approximately the same time, it was observed that the steady-state error of the system under FSMC was approximately 27% less. In addition, it was observed that the maximum overshoot amount was approximately 12.3 times higher in the SMC system than in the FSMC system. This high amount of overshoot causes the risk of de-orbiting the chaser cube satellite in the space environment and means quite high energy consumption. In addition, considering the controller outputs, it was observed that the switching was quite hard in the SMC system, while the switching was relatively soft in FSMC system. Considering all these results, it is concluded that the FSMC controller is more efficient and applicable than the SMC controller for the proposed system.