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Acta Aeronautica et Astronautica Sinica ›› 2025, Vol. 46 ›› Issue (22): 331759.doi: 10.7527/S1000-6893.2025.31759

• Electronics and Electrical Engineering and Control • Previous Articles    

Quasi-spectral trajectory optimization for vehicle based on actual dynamic equations

Yuanzhuo WANG, Honghua DAI(), Xiaokui YUE   

  1. School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2025-01-03 Revised:2025-03-18 Accepted:2025-04-27 Online:2025-05-12 Published:2025-05-08
  • Contact: Honghua DAI E-mail:hhdai@nwpu.edu.cn
  • Supported by:
    National Science Fund for Distinguished Young Scholars of China(52425212);National Key Research and Development Program of China(2021YFA0717100);National Natural Science Foundations of China(12072270)

Abstract:

To achieve precise control of terminal states for near-space vehicles under underactuated conditions, it is necessary to overcome the limitations of onboard computational capability and develop a highly precise and efficient trajectory optimization framework in computational guidance. If the number of discretization points is too low, existing Newton-type trajectory optimization methods by deviation dynamic equations (Model Predictive Static Programming) have large terminal control errors. Motivated by current quasi-spectral Newton method, a quasi-spectral optimization method is proposed by actual dynamic equations. Unlike existing methods that update the optimization coefficient indirectly, this method updates the optimization coefficient directly. Additionally, it is proven that this method is a Newton optimization method, and it is clearly shown that when damping mechanism is not considered, this method suffers from poor robustness during multiple iterations. To address the poor robustness and low control accuracy in typical Newton methods, an adaptive trajectory optimization method is proposed with fuzzy control. This method avoids the divergence problem commonly encountered in damping-free methods with sensitive initial values, thereby enhancing both robustness and accuracy. Simulation results show that the proposed method achieves faster dynamic trajectory optimization than existing methods under identical conditions.

Key words: vehicle guidance, optimal control systems, quasi-spectral trajectory optimization, direct update of optimization coefficient, fuzzy adaptation

CLC Number: