螺旋俯冲机动突防的制导律设计

针对识别和拦截技术高度发展所带来的突防难题，提出高超声速滑翔飞行器（HGV）螺旋俯冲机动突防的概念，并为此设计了一种基于虚拟滑动目标的自适应比例导引律。首先，通过分析HGV绕目标飞行的运动学特性，建立对数型的螺旋运动模型，以该模型为基础利用曲线渐伸线原理设计虚拟目标的滑动轨迹。然后，采用包含时变附加项的比例导引律追踪虚拟目标，从而实现引导HGV进行螺旋俯冲机动以及对真实目标的打击。接着，为提高虚拟目标的跟踪精度以及抵抗外部干扰的能力，设计了制导参数的闭环非线性自适应律，能根据当前偏差在线选择制导参数值。此外，还分析了满足收敛条件的制导参数的取值范围以及其进入闭环更新的策略。最后，分别针对静止目标和低速移动目标进行数值仿真验证，结果表明所设计的制导律不但能够引导HGV实施螺旋俯冲机动，还能够准确地命中目标。

Guidance law design for spiral-diving maneuver penetration

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.