Impact Angle Constrained Guidance Against Nonstationary Nonmaneuvering Targets
Impact Angle Constrained Guidance Against Nonstationary Nonmaneuvering Targets
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DOI：
10.2514/1.45026
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发表时间：
2010
影响因子：
2.6
通讯作者：
Ashwini Ratnoo;D. Ghose
中科院分区：
文献类型：
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作者：
Ashwini Ratnoo;D. Ghose
在文献[1-7]中广泛报道了具有终端碰撞角约束的重力定律。比例导引（PNG）已被用于推导固定和运动目标的命中角约束制导律。Lu等人[8]在一种自适应制导律中使用了PNG，以实现对静止目标的超高速撞击角约束命中。Ratnoo和Ghose [9]通过改变PNG的导航常数N来满足撞击角约束。在他们的工作[9]中，提出了一种两阶段PNG律，用于在地对地交战中实现对静止目标的所有撞击角。Kim等人[3]提出的有偏PNG（BPNG）定律有一个额外的项，用于消除终端碰撞角误差以及横向加速度命令的常规视线速率项。BPNG律扩展了现有制导律对运动目标的捕获范围。然而，BPNG法律的性能恶化与尾随类的约定。这里讨论了实现对运动目标的所有撞击角度的问题。Ratnoo和Ghose [9]提出的两阶段PNG律的思想被进一步研究和发展，用于非平稳非机动目标。应该注意的是，对于不同的N值，PNG定律导致针对移动目标的一组撞击角度。然而，对经典PNG定律[10]的研究表明，N的值应大于终端横向加速度需求的最小值。可实现的一组的影响角度推导出PNG法律，与N的值满足上述约束。为了实现剩余的命中角，拦截器弹道的初始阶段的定向制导方案被提出。定向制导律也是PNG律，N是初始啮合几何形状的函数。它被证明，以下的定向轨迹，拦截器可以切换到N3，并实现任何期望的影响角在一个地对地接合的情况。
G UIDANCE laws with terminal impact angle constraints are widely reported in the literature [1–7]. Proportional navigation guidance (PNG) has been used for deriving impact angle constrained guidance laws for stationary and moving targets. Lu et al. [8] have used PNG in an adaptive guidance law for a hypervelocity impact angle constrained hit at a stationary target. Satisfying impact angle constraint by varying the navigation constant N of the PNG is addressed by Ratnoo and Ghose [9]. In their work [9], a two-stage PNG law is proposed for achieving all impact angles against stationary targets in surface-to-surface engagements. A biased PNG (BPNG) law proposed by Kim et al. [3] has an extra term for annulling the terminal impact angle error together with the conventional line-of-sight rate term for the lateral acceleration command. BPNG law expands the capture region of existing guidance laws against moving targets. However, the performance of BPNG law deteriorates with tail-chase kinds of engagements. The problem of achieving all impact angles against moving targets is addressed here. The idea of a two-stage PNG law, proposed by Ratnoo and Ghose [9], is further investigated and developed for nonstationary nonmaneuvering targets. It should be noted that for different values of N, the PNG law results in a set of impact angles against a moving target. However, studies on classical PNG law [10] reveal that the value of N should be greater than a minimum value for the terminal lateral acceleration demand to be bounded. The achievable set of impact angles is derived for PNG law, with the values of N satisfying the previously mentioned constraint. To achieve the remaining impact angles, an orientation guidance scheme is proposed for the initial phase of the interceptor trajectory. The orientation guidance law is also PNG law, withN being a function of the initial engagement geometry. It is proven that, following the orientation trajectory, the interceptor can switch to N 3 and achieve any desired impact angle in a surface-to-surface engagement scenario.