Trajectory And Guidance Law Design Of Terminal Area Energy Management For Reusable Launch Vehicle

Terminal area energy management is a critical stage of reusable launch vehicle's reentry phase. It guarantees the reusable launch vehicle can return to the airport successfully. Therefore, the trajectory and guidance law of Terminal area energy management for reusable launch vehicle is studied.The motion model of reusable launch vehicle is established firstly. The concept and design method of energy corridor is presented. The meaning of energy profile in energy corridor is explained and the flight range of reusable launch vehicle is assured. To guarantee the energy corridor is effective, numerical simulations are used with the same initial condition and dynamic pressure profile design.The guidance scheme is divided in two parts, longitudinal and lateral. The overall scheme and equation of state are built in this thesis. To guarantee the guidance law is effective, three degree of freedom simulation is used in the nominal condition. Monte Carlo simulations are conducted in three conditions, including initial error, dynamic parameter error, and aircraft parameter error, to verify the robustness of the guidance law.Another guidance law is obtained using the sliding mode control theory. Sliding mode control has the advantage of fast response speed, insensitive to parameter and disturbance, and easily physical realization. To guarantee the guidance law is effective, three degree of freedom simulation is taken in the nominal condition. Monte Carlo simulations are conducted in three conditions, including init ial error, dynamic parameter error, and aircraft parameter error, to verify the robustness of the guidance law. trajectory and guidance law design method are researched in this paper. Some conclusion of this thesis must be useful in the future work...