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Integrated Adaptive Nonlinear Guidance and Control Applied toan Agile Vehicle

Sayyedipour, Hamed | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45961 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Fathi, Mohsen
  7. Abstract:
  8. Integrated guidance and control (IGC) as a new approach to guidance and control methods has been studied in this thesis. A new approach to nonlinear aerodynamic formulation with backstepping controller has been proposed in order to improve interception. Various curve fitting techniques like Gram-schmidt method has been tested. But finally a planar aerodynamic formulation was used which only varies with angle of attack. Results showed that the proposed method requests smaller control input than the linear IGC formulation and conventional G&C methods, because of more precise knowledge of normal force coefficient. Thus the vehicle experiences smaller angle of attack and normal acceleration. Also as an important & effective result it has smaller control effort than that of the other methods. Heading error analysis shows that if maximum target acceleration is chosen correctly, IGC will be stable even at high heading errors of more than 15 degrees. At last performance of IGC using linear aerodynamic approximation, the proposed method and conventional G&C has been evaluated in the presence of noise and uncertainties. All three methods have good performance but both IGC formulations (Linear and nonlinear aerodynamic approximation) showed better performance than conventional G&C in the presence of random maneuver time of target & receiver noise. Sample runs show that both IGC formulations have better miss distance than conventional method in the presence of target's evasive maneuvers with nearly equal (IGC with linear Aerodynamic approximation) and smaller (IGC with nonlinear Aerodynamic approximation) control effort
  9. Keywords:
  10. Back-Stepping Method ; Nonlinear Controller ; Adaptive Controller ; Uncertainty ; Noise ; Aerodynamics ; Heading Error ; Integrated Guidance and Control (IGC)

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