Entry trajectory generation with complex constraints based on three-dimensional acceleration profile

Abstract

A new entry trajectory generation based on three-dimensional acceleration profile is proposed for hypersonic glide vehicles, meeting range requirement while taking waypoint and no-fly zone constraints into consideration. Firstly, the path constraints, such as maximum dynamic pressure, total overload and peak heating flux at the stagnation-point, are transformed into longitudinal and lateral flight corridors. And the initial lateral and longitudinal sub-profiles are obtained in sequence based on a layered strategy. Secondly, in order to accurately guide the vehicle to reach a target, a method based on Newton's iterative and bisection search is proposed, and the three-dimensional acceleration profile satisfying the mission requirement is quickly obtained. Further, this approach is extended to accommodate the trajectory generation with regarding the waypoint and no-fly zone constraints. Finally, a three-dimensional tracking law is designed to follow the reference trajectory, verifying the feasibility and accuracy of the proposed method.