Output feedback control for a class of uncertain non-affine nonlinear systems

In this paper, output feedback control is investigated for a class of uncertain non-affine nonlinear discrete-time systems. Feedback linearization is employed and a novel dynamic linear observer is built based on the measured output information, which can be used to estimate the unknown feedback linearization error. The proposed control is robust to the modeling errors and of great significance in engineering practice due to its simple linear control architecture. Moreover, the fix-point problem usually met in feedback linearization design for non-affine nonlinear system is solved under a loose condition. Simulation results show the effectiveness of the proposed control approach.