Nonlinear adaptive guidance considering target uncertainties and control loop dynamics

Abstract

This paper proposes a new nonlinear adaptive guidance law. The fourth order state equation for integrated guidance and control loop is formulated considering target uncertainties and control loop dynamics. The state equation is further changed into the normal form by nonlinear coordinate transformation. A nonlinear adaptive guidance law is proposed to compensate the uncertainties in both target acceleration and control loop dynamics. The proposed law adopts the sliding mode control approach with adaptation for unknown bound of uncertainties. The present approach can effectively solve the existing guidance problem against target maneuver and the limited performance of control loop. We provide the stability analyses and demonstrate the effectiveness of our scheme through simulations.