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Penetration landing guidance trajectories in the presence of windshear

1989; American Institute of Aeronautics and Astronautics; Volume: 12; Issue: 6 Linguagem: Inglês

10.2514/3.20485

1533-3884

A. Miele, T. Wang, W. W. Melvin,

Computational Fluid Dynamics and Aerodynamics

Flight trajectory guidance in the presence of windshear is considered with reference to flight in a vertical plane. Both horizontal shear and the presence of a downdraft are assumed. The optimal trajectory is first determined by minimizing a performance index which is subject to touchdown constraints, under the assumption of control via angle of attack and power setting. It is shown that the coupling relation between the angle of attack and the power setting can be ignored. A guidance scheme is constructed in which the angle of attack is determined by the windshear intensity, the absolute path inclination, and the glide slope angle, while the power setting is determined by the windshear intensity and the velocity. Particular attention is given to low-altitude penetration landing.