Time-varying dynamic sliding mode control of a nonlinear aerospace launch vehicle

Abstract

Tracking of guidance commands for nonlinear aerospace launch vehicles, ALV, during atmospheric flight is studied in dynamic sliding mode. Time-varying linearized dynamics of nonlinear ALV are achieved using small perturbations approach rendered into a regular form. A time-varying dynamic sliding mode controller is then designed by utilizing dynamic compensators for the linearized system at each moment to provide output tracking in presence of unmatched disturbances. Simulation results are conducted to demonstrate performance, robustness, and stability of the proposed autopilot.