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题名: The Method for Calculating Atmospheric Drag Coefficient Based on the Characteristics of Along-track Error in LEO Orbit Prediction
作者: Wang Hongbo; Zhao Changyin; Liu Zhonggui; Zhang Wei
刊名: Acta Astronomica Sinica
出版日期: 2016
卷号: 57, 期号:4, 页码:447-460
英文摘要: The errors of atmosphere density model and drag coefficient are the major factors to restrain the accuracy of orbit prediction for the LEO (Low Earth Orbit) objects, which would affect unfavorably the space missions that need a high-precision orbit. This paper brings out a new method for calculating the drag coefficient based on the divergence laws of prediction error's along-track component. Firstly, we deduce the expression of along-track error in LEO's orbit prediction, revealing the comprehensive effect of the initial orbit and model's errors in the along-track direction. According to this expression, we work out a suitable drag coefficient adopted in prediction step on the basis of some certain information from orbit determination step, which will limit the increasing rate of along-track error and reduce the largest error in this direction, then achieving the goal of improving the accuracy of orbit prediction. In order to verify the method's accuracy and successful rate in the practice of orbit prediction, we use the full-arcs high precision position data from the GPS receiver on GRACE-A. The result shows that this new method can significantly improve the accuracy of prediction by about 45%, achieving a successful rate of about 71% and an effective rate of about 86%, with respect to classical method which uses the fitted drag coefficient directly from orbit determination step. Furthermore, the new method shows a preferable application value, because it is effective for low, moderate, and high solar radiation levels, as well as some quiet and moderate geomagnetic activity condition.
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16850
Appears in Collections:空间目标与碎片观测研究基地_期刊论文

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