新近月球重力场模型与地形模型的局部导纳和相关性分析

Localized gravity/topography admittance and correlation analysis of recent lunar gravity field models

本文利用三个高阶重力场模型LP150Q、GLGM-3和SGM150j以及嫦娥地形模型CLTM-s01,在频率域内使用固定窗口的方法,研究了不同重力场模型的重力/地形局部导纳谱与局部相关谱的全球分布,以及典型质量瘤盆地重力/地形局部导纳谱与局部相关谱分布的特征.结果表明:加入远月面重力场信息有助于增强重力场模型在中高频段的信号强度;三个重力场模型LP150Q、GLGM-3和SGM150j均适合于作近月面重力/地形局部导纳与局部相关性的分析和近月面地球物理参数的估计;重力场模型LP150Q和GLGM-3较适合作远月面大范围的研究,不适合于作远月面重力/地形局部导纳谱与局部相关谱的分析以及作远月面局部区域地球物理参数的估计,SGM150j较适合于作远月面局部区域地球物理参数的估计;近月面大型质量瘤盆地异常质量的尺度比远月面质量瘤盆地异常质量的大,而深度也比远月面的深.

Based on the high degree lunar gravity field models LP150Q, GLGM-3 and SGM150j, and ChanglE topography model CLTM-s01, the localized gravity/topography admittance and correlation for various gravity field models within an axisymmetric window of fixed widths in the spectral domain are studied. Localized gravity/topography admittance and correlation for some typical mascon basins are also investigated. The results firstly show that the power spectra of the lunar gravity field from medium- to high-frequency can be increased after adding the lunar farside gravity field data. Moreover, all the models are appropriate for localized gravity/topography admittance and correlation analysis on the near side of the moon, which indicates that all the models can be used to estimate the localized geophysical parameters on the nearside. As to estimation of localized geophysical parameters on the farside, however, SGM150j is quite suitable. Finally, there is more mass anomaly in the main mascon basins on the nearside than those on the farside and such mass anomaly comes deeper than that on the farside.