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首页> 外文会议>Congress of the International Council of the Aeronautical Sciences >OPTIMUM FLIGHT TRAJECTORIES AND SENSITIVITY ANALYSIS FOR TERRAIN COLLISION AVOIDANCE SYSTEMS
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OPTIMUM FLIGHT TRAJECTORIES AND SENSITIVITY ANALYSIS FOR TERRAIN COLLISION AVOIDANCE SYSTEMS

机译：地形碰撞避免系统的最佳飞行轨迹和敏感性分析

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Military aircraft are often flown in close proximity to terrain, which can result in controlled collision into terrain. In this paper, various methodologies are presented for computing optimal trajectories within a digital terrain 3D map to avoid collision. Two main issues are addressed in this paper. Firstly, various optimal flight trajectories are computed subject to different objectives, eg terrain following, minimum time, etc. while avoiding collision. These simulations show that it is possible to generate flyable trajectories within terrain to avoid collision. In practice, flight instruments are not fully accurate and the question is how sensitive is the optimum flight trajectory to input errors. This is essential to understand as terrain clearances can be small. To assess this, the optimal flight trajectories are flown again with a small change in the initial conditions. Optimal terrain following is considered as a minimax optimal control problem, which is solved using direct Within a very general framework for solving such problems, we are able to transform the non-smooth cost function into a constrained nonlinear programming problem. In the formulation, we are also able to solve optimal terrain avoidance manoeuvres. To ensure smooth derivatives of the terrain, we approximate it using B-Splines. The implementation and numerical case studies for different constraints, and initial aircraft position/velocity and the errors in trying to follow the optimal trajectory are discussed.
机译：军用飞机通常靠近地形，这可能导致控制的地形。在本文中，呈现各种方法用于计算数字地形3D地图中的最佳轨迹以避免碰撞。本文提出了两个主要问题。首先，计算各种最佳飞行轨迹，以不同的目标，例如地形跟随，最短时间等。在避免碰撞时。这些模拟表明，可以在地形中生成可传单轨迹以避免碰撞。在实践中，飞行仪器并不完全准确，问题是输入错误的最佳飞行轨迹的敏感程度。这对于地形间隙可能很小，这是必不可少的。为了评估这一点，最佳飞行轨迹再次飞行初始条件的较小变化。最佳地形跟随被认为是一个极小极大最优控制问题，这是使用直接在解决这类问题非常普遍的框架解决了，我们能够在非平滑成本函数转变成一个约束非线性规划问题。在制定中，我们还能够解决最佳地形避免演习。为了确保地形的平滑衍生物，我们使用B样条近似。讨论了不同约束的实现和数值案例研究，以及初始飞机位置/速度以及试图遵循最佳轨迹的误差。

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