Prescribed-time disturbance rejection tracking control of output-constrained systems with applications to Mars entry vehicle

This paper studies the prescribed-time disturbance rejection tracking control problem for output-constrained systems. First, a prescribed-time output-constrained function is constructed and a category of time-varying barrier Lyapunov functions is developed. Then, a time-varying nonlinear extended state observer-based control scheme is designed without using the information of the disturbance boundary, which can make the tracking errors of the output-constrained system tend to zero in a prescribed time under unknown disturbances, and the control signals are bounded. Finally, the prescribed-time disturbance rejection tracking control approach is applied to the Mars entry vehicle tracking control under the output constraint, and a set of numerical simulations verify the effectiveness of the proposed method.