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《Computer Engineering & Science》 2016-01
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Autonomous lunar gravitational field determination via relative position measurement of the satellite formation

WANG Yi;XING Jian-jun;YU Yang;ZHENG Li-ming;ZHAO Yan-peng;LIU Chen;School of Aeronautics and Astronautics,Central South University;College of Aerospace Science and Engineering,National University of Defense Technology;  
In view of the shortcoming that the data of the lunar back,cannot be directly measured and it leads to the low accuracy of the gravitational field,we propose an autonomous lunar gravitational field determination method based on dual satellite formation.Considering the effect of the lunar gravitational field on the relative position of satellite formation,the proposal adopts the extend Kalman filter(EKF)algorithm to handle the measurement data of satellite distance,and uses the difference between the measured data and the predicted data to modify the predicted status so as to obtain the estimate value of the status,thus realizing autonomous precise orbit determinations and determining the lunar gravitational field.The resulting system can achieve an orbital position accuracy of 5.04 m,an orbital velocity accuracy of 6.07×10~(-3) m/s,agravity accuracy of 3.47×10~7 m~3/s~2 and the coefficient of a lunar perturbation accuracy of 9.14×10~(-8) in the time period of approximately 7 430 seconds.Simulation results verify the effectiveness of the program and improve the existing model of the lunar gravitational field to a certain extent.It can provide more technical information for the"Chang E Project"of China.
【Fund】: 中国博士后基金(20080440217 200902666);; 中南大学中央高校基本科研业务费专项资金(2013zzts264)
【CateGory Index】: P184.5
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