Abstract
In this paper, first, the nonlinear flight trajectory controller for an aircraft is designed using singular perturbation theory. The control system consists of a slow-time scale subsystem and a fast-time scale subsystem. Since a digital computer is used to realize these subsystems, they are reduced to digital control systems. Then, the sampling periods for which the subsystems become stable are computed using linear discrete-time control theory. They are the good criteria for selection of the sampling periods for the flight controller.
