螺旋俯冲机动突防的制导律设计

Aiming at the penetration challenge brought by the rapid development of identification and interception technologies, this paper proposes a spiral-diving maneuver concept to improve the penetration capability for Hypersonic Gliding Vehicle (HGV). An adaptive proportional navigation guidance law based on the virtual sliding target is designed to implement this spiral-diving maneuver. First, a logarithmic spiral motion model is constructed by analyzing the lateral kinematic characteristics of HGV flying around the target. The locus of virtual sliding target is designed from this motion model by using the principle of involutes. Then, a proportional navigation guidance law with a time-varying term is adopted to track the virtual sliding target, thereby realizing the spiral-diving maneuver as well as the attack on the real target. To ensure high precision tracking of the virtual target in spiral-diving maneuver, a closed-loop nonlinear updating law is developed with online determination of the guidance parameters. Furthermore, the convergence condition of this updating law and the switching strategy are also theoretically analyzed. Numerical simulations are performed to verify the spiral-diving maneuver and guidance law for the stationary targets and low-speed moving targets. The results show that the proposed guidance law is able to not only achieve the spiral-diving maneuver, but also hit the target accurately.