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Multi-Objective Optimization of An Explicit Guidance Law for Space Reentry Vehicle Using Bezier Curves

Goldasteh, Ali | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52311 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Fathi Jegarkandi, Mohsen
  7. Abstract:
  8. The goal of this thesis is to devise a guidance law that has the required ability and flexibility to construct a variety of return trajectories for a reentry capsule to the atmosphere. One of the commonly used methods for guiding flying vehicles with a fixed initial position and a fixed target is to load the trajectory data into the vehicle's computer memory. But the devised guidance law in this thesis does not require the trajectory data. Based on the relations governing the Bezier curve, it constructs the desired trajectory online. It also has the ability to provide the desired angle of landing and the desired magnitude of final speed. Further studies indicate that this ability is also true for moving targets. The topic of thermal flux minimization and control effort has led to the use of optimization techniques to find the optimum trajectory from the variety of trajectories that this guidance law suggests. The main feature of this method is it requires a little control effort on a large part of the trajectory. This feature is a great advantage for the spacecraft to perform a large number of its maneuvers at the beginning and ending of the trajectory, and the constraints of the structure, the passengers and etc. do not spoil the optimality of the trajectory
  9. Keywords:
  10. Guidance Laws ; Reentry to Atmosphere ; Bezier Curve ; Trajectory Correction ; Optimization

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