Bounded output feedback stabilization for nonlinear planar systems with unknown structures and measurements

This paper investigates the problem of globally bounded output feedback stabilization for a class of uncertain planar systems with unknown nonlinear structures and measurements. The key technique behind the proposed strategy mainly involves skillfully leveraging and revamping the idea of the classical lead compensator, in conjunction with a saturation function-based mechanism, to establish a novel approach guiding the construction of an output feedback controller obeying freely assignable bounded control magnitudes. The primary innovations of the presented scheme lie in surmounting the obstacles in the design of state observers for systems suffering from unknown structures and measurements and offering an explicit design of a dynamic output feedback global stabilizer that enjoys the enhanced stability properties originated from lead compensators capable of effectively compensating unknown structures/measurements. A numerical simulation demonstrating the effectiveness of the devised method is also provided.