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首页> 外文期刊>Journal of geophysical research. Planets >An improved lunar gravity field model from SELENEand historical tracking data: Revealing the farsidegravity features
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An improved lunar gravity field model from SELENEand historical tracking data: Revealing the farsidegravity features

机译：利用SELENE和历史跟踪数据改进的月球重力场模型：揭示远端重力特征

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A new spherical harmonic solution of the lunar gravity field to degree and order 100,called SGM100h, has been developed using historical tracking data and 14.2 months ofSELENE tracking data (from 20 October 2007 to 26 December 2008 plus 30 January2009). The latter includes all usable 4-way Doppler data collected which allowed directobservations of the farside gravity field for the first time. The new model successfullyreveals farside features in free-air gravity anomalies which are characterized byring-shaped structures for large impact basins and negative spots for large craters.SGM100h produces a correlation with SELENE-derived topography as high as about 0.9,through degree 70. Comparison between SGM100h and LP1OOK (one of the pre-SELENEmodels) shows that the large gravity errors which existed in LP100K are drasticallyreduced and the asymmetric error distribution between the nearside and the farside almostdisappears. The gravity anomaly errors predicted from the error covariance, throughdegree and order 100, are 26 mGal and 35 mGal for the nearside and the farside,respectively. Owing to the 4-way Doppler measurements the gravity coefficients belowdegree and order 70 are now determined by real observations with contribution factorslarger than 80 percent. With the SELENE farside data coverage, it is possible to estimatethe gravity field to degree and order 70 without applying any a priori constraint orregularization. SGM100h can be used for global geophysical interpretation through degreeand order 70.
机译：利用历史跟踪数据和14.2个月的SELENE跟踪数据（从2007年10月20日到2008年12月26日加上2009年1月30日），开发了一种新的月球重力场达到100度阶数的球谐函数，即SGM100h。后者包括收集的所有可用的四向多普勒数据，这首次允许直接观测远端重力场。新模型成功地揭示了自由空气重力异常的远端特征，这些异常特征的特征是大型撞击盆地的环形结构和大型陨石坑的负点。SGM100h与SELENE派生的地形之间的相关性最高，可达70度，约为0.9。比较SGM100h和LP1OOK（SELENE之前的模型之一）之间的距离表明，LP100K中存在的大重力误差被大大减小，并且近侧和远侧之间的不对称误差分布几乎消失了。根据误差协方差，度数和阶数100预测的重力异常误差，在近侧和远侧分别为26 mGal和35 mGal。由于进行了四向多普勒测量，现在可以通过贡献大于80％的实际观测确定低于度数和70阶的重力系数。利用SELENE远端数据覆盖范围，可以在不应用任何先验约束或规则化的情况下将重力场估计为度数和阶数为70。 SGM100h可用于70级以下的全球地球物理解释。

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