Adaptive proportion navigation guidance for vehicle terminal flight

The guidance system of terminal flight is to guide the vehicle flies into the target precisely in a specific direction while satisfy all the constraints. A new adaptive proportion navigation guidance method is proposed. First the constraints are analyzed. To provide enough time for the lateral and longitudinal adjustments, a convergence strategy is designed and it improves the performance of proportion navigation guidance greatly. By considering the dynamics of vehicle, the execute errors of guidance commands are eliminated with an on-line navigation constants adaptive law. The angle rates of flight path angle and heading angle are converted into angle of attack and bank angle commands through command allocation. The simulation results show that the proposed terminal guidance method is precise and reliable.