INTELLIGENT FAULT DETECTION, IDENTIFICATION AND CONTROL OF SATELLITE FORMATION FLYING

A class of nonlinear leader-follower satellite formation flying system subject to uncertain thruster faults and external J(2) disturbances has been studied in this paper with the help of FDI and second order sliding mode control. The faults considered are modeled as constant and time-varying faults which can occur randomly. It is proved that the proposed control scheme can guarantee all signals of the closed-loop system to be semi globally, uniformly, and ultimately bounded, and the tracking error can converge to a small neighborhood near zero. Simulation results confirm that the suggested control methodologies yield high formation keeping precision and effectiveness for leader-follower formation flying systems. The numerical results demonstrate the effectiveness of the proposed active fault tolerant control under thruster faults.