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�������պ����ѧѧ�� 2007, Vol. 33 Issue (05) :539-543    DOI:
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Fuzzy variable structure control for lunar gravity-turn landing
Zhu Jianfeng, Xu Shijie*
School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Based on fuzzy variable structure control, a new guidance law of gravity-turn landing has been developed for the terminal descent phase of lunar soft landing. The sub-optimal sliding surface and fuzzy controller were designed to drive sliding variable converging to zero that would make a soft landing on the lunar surface safely. The bias of the descent engine-s thrust,the estimation of the lander-s initial mass and the lunar gravitational acceleration,the disturbances of initial conditions,the measurement error of sensors and attitude tracking error were considered. The Monte Carlo simulation has demonstrated that the guidance law is robust to all bias and disturbances. Therefore, the guidance law designed is feasible. It requires only slant range and slant range rate, and it is easy to implement in lunar soft landing mission.
Keywords�� lunar landing   sliding mode control   Monte Carlo methods     
Received 2006-07-04;
Fund:

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�콨��, ������.��������ת������½��ģ����ṹ����[J]  �������պ����ѧѧ��, 2007,V33(05): 539-543
Zhu Jianfeng, Xu Shijie.Fuzzy variable structure control for lunar gravity-turn landing[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(05): 539-543
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