Discrete-Time Prescribed Performance Control of an Air-Vehicle’s Seeker Stabilized Platform

Most of the existing prescribed performance control (PPC) methodologies are developed in the continuous-time domain. In this article, a discrete-time PPC (DPPC) strategy is investigated for an air-vehicle’s seeker stabilized platform. Unlike the existing DPPC whose convergence time drifts with the sampling time, the proposed controller is able to guarantee tracking errors with fixed convergence time via devising a new discrete-time performance function, which improves the engineering practicability. Moreover, a new disturbance observer is constructed to estimate both system uncertainties and external disturbances. In addition, the backstepping procedure is used to design a DPPC approach for the sake of stabilizing transformed errors. This endows tracking errors with desired fixed-time prescribed performance. Finally, the efficiency of design is verified via compared simulations.