【作者】 沈飞；

【导师】 李建成；

【作者基本信息】 武汉大学 ， 固体地球物理学， 2005， 硕士

【摘要】 月球重力场作为月球的主要物理特征之一,在月球的研究中具有非常重要的作用。月球重力场知识是月球探测器飞行轨道的设计和环月轨道的精确确定的重要前提,同时也是精确确定月球大地参考框架的基础。精确的月球重力场也是研究月球内部构造、月球演化历史,以及开发月球资源的基础信息。 本文对各个时期的月球探测计划进行了深入研究,并着重分析了月球重力场的确定方法,以视线加速度来确定月球近区重力场的直接方法作为主要研究内容。通过“Lunar Prospector”扩展任务获得的视线加速度数据,利用分步最小二乘的方法计算月球近区的重力异常。最后将计算结果和现今最高阶次的月球重力场模型LP165进行了比较和分析,得出标准差在纬度-75°～75°范围内为±27.354mGal,75°～85°,-85°～-75°范围内为±61.965mGal的精度,从而验证了该解算方法的可行性和可靠性。更多还原

【Abstract】 As one of the moon’s main physical features, lunar gravitational field plays a very predominant role in the study of the moon. The knowledge of the lunar gravitational field is the precondition of the lunar satellite orbit’s designment and precise determination, and it is the base of the foundation of the lunar geodetic reference frame. In addition, the accurate lunar gravitational field is the essential information of studying the lunar internal structure, the evolution history and the exploitation of moon’s resource as well.In this thesis, the past lunar exploration missions are described in detail, and the methods of determining the lunar gravitational field are analyzed in particular. Then the direct method is selected as the main research object, which processes the line-of-sight acceleration data from the Lunar Prospector extended mission using multiple step least square fitting method. Finally, the gravity anomaly of the nearside is obtained, and is compared with the latest lunar gravitational model LP165. It showsthat the standard deviation in the domain -75° ~ 75° is ±27.354 mgal, and75° ~ 85°,-85° —75° is ±61.965 mgal, which verifies the feasibility and reliability of this method.更多还原