Suboptimal terminal feedback control of nonstationary, nonlinear systems

A suboptimal approach for terminal feedback control of nonlinear systems which may include time-varying parameters is presented. The scheme is adaptive in nature and viability is established with simulation results for first, the stationary Van der Pol equation and second, for the more meaningful nonstationary, two dimensional missile intercept problem. The distinctive advantages over other approaches include: (1) no nominal solution is required; (2) no assumed form of suboptimal control law is required; (3) the procedure is applicable to terminal (target set) control problems and (4) the present scheme is more suitable for terminal control of nonlinear, non-stationary systems in real-time applications than existing optimal and suboptimal approaches.