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		Yin WANG,Yuping LU.[en_title][J].Control Theory and Technology,2012,10(2):264~267.[Copy]

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YinWANG,YupingLU
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(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics;College of Astronautics, Nanjing University of Aeronautics and Astronautics)

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Received:October 09, 2009Revised:March 23, 2011

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Design of longitudinal predictive re-entry guidance law based on variable universe fuzzy-PI composite control

Yin WANG,Yuping LU

(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics;College of Astronautics, Nanjing University of Aeronautics and Astronautics)

Abstract:

This paper studies the longitudinal predictive re-entry guidance law based on the variable universe fuzzy-PI composite control to overcome the inaccuracy of the reference trajectory re-entry guidance for re-entry vehicles. The variable universe fuzzy controller is used to obtain a satisfactory dynamic response when the downrange error is large, and the PI controller is utilized to eliminate the steady-state error when the downrange error is small. Simulation results show that the proposed guidance law is very robust to the initial errors and can achieve better accuracy, and is also able to handle the effect of the stochastic errors in re-entry processes.

Key words: Re-entry guidance Variable universe Fuzzy control PI control