临近空间飞行器导航中重力模型研究

【作者】 陈凯； 董凯凯；

【机构】 西北工业大学航天学院；

【摘要】 在临近空间飞行器惯性导航过程中,为了求解比力方程,需要使用一个有效的重力模型。论文讨论了常用的4种常用重力模型以及它们之间的本质的差别。为了方便这几个模型的比较,本文使用2000国家大地坐标系,同时在参考椭球面上把重力各个分量转化为东北天当地水平坐标系。这四种重力模型分别为正常重力模型、魏子卿重力模型、低高度重力模型和J2模型。论文对这几种模型进行了推导,阐述了它们之间的区别和联系,并且指出了基于不同模型的各个重力分量的方向和大小,为后续研究不同的重力模型对临近空间导航精度影响的不同奠定了理论基础。更多还原

【Abstract】 In order to accurately mechanize the navigation equations,inertial navigation systems must utilize a valid gravity model in the process of near space vehicle inertial navigation.In this paper,five commonly used gravity models and their differences are discussed.To make consistent comparisons,2000-national parameters are used and gravity components are transformed to the local level navigation frame at the surface of the reference ellipsoid.The four gravity models are described as:normal gravity model,Wei Zi-qing gravity model,Low altitude gravity model and J2 gravity model.In this paper,the model is deduced and the differences and relations between them are expounded.Besides,the direction and magnitude of the gravity components based on different models are pointed out,which lays a theoretical foundation for the following study of different gravity models that will influence the precise of near space vehicle navigation.更多还原