Bounded-acceleration impact time control guidance based on look-angle shaping

This paper proposes a novel impact time control guidance scheme with bounded normal acceleration. A look-angle profile, formulated as a hyperbolic tangent function of range-to-go, enables accurate impact timing using measurable quantities. A numerical algorithm estimates time-to-go based on this profile, adjusting a single parameter online for impact time regulation. The profile is further updated using the predicted intercept point to compensate for disturbances. A second-order sliding mode controller with bounded integral action ensures accurate tracking of the desired profile under input constraints. The approach enables effective impact time control. Simulations validate the method's effectiveness against both stationary and moving targets, demonstrating high terminal accuracy and suitability for cooperative interception missions.