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The Scientific World Journal - Volume 2014 2014, Article ID 878193, 13 pages -

Research Article

School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China

Beijing Microelectronics Technology Institute, Beijing 100076, China

Received 26 October 2013; Accepted 16 December 2013; Published 16 January 2014

Academic Editors: A. F. B. A. Prado and A. Viviani

Copyright © 2014 Jiang Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Of the many direct numerical methods, the pseudospectral method serves as an effective tool to solve the reentry trajectory optimization for hypersonic vehicles. However, the traditional pseudospectral method is time-consuming due to large number of discretization points. For the purpose of autonomous and adaptive reentry guidance, the research herein presents a multistage trajectory control strategy based on the pseudospectral method, capable of dealing with the unexpected situations in reentry flight. The strategy typically includes two subproblems: the trajectory estimation and trajectory refining. In each processing stage, the proposed method generates a specified range of trajectory with the transition of the flight state. The full glide trajectory consists of several optimal trajectory sequences. The newly focused geographic constraints in actual flight are discussed thereafter. Numerical examples of free-space flight, target transition flight, and threat avoidance flight are used to show the feasible application of multistage pseudospectral method in reentry trajectory optimization.





Autor: Jiang Zhao, Rui Zhou, and Xuelian Jin

Fuente: https://www.hindawi.com/



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