a numerical investigation on the roll damping coefficient of a typical airship based on the computational fluid dynamics

Nonsingular terminal sliding mode (ntsm) guidance for intercepting the desired line of sight (los) angle in terminal phase is proposed in this paper. in order to satisfy the predefined los angle and to intercep into target, a nonsingular terminal sliding variable is introduced. in reaching phase, in the presence of uncertainties such as target maneuvers, robust ntsm guidance law is designed in order forzeroing the sliding variable in finite reaching time. then, in sliding phase, due to introducing nonsingular terminal sliding variable, finite time stability of line of sight angle and line of sight angular rate is granteed without singularity in commanded acceleration as control signal numerical simulations are presented to illustrate the potential of the proposed guidance law.