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GEOPHYSICS AND GEODESY
LIDAR采集的月形数据,支持了月球形状研究,取得了重要进展。其单枪测量精度为
Clementine 在月球重力场研究中提供了超过一年的数据支持。
To date, the most thoroughly studied measurements from Clementine are those of the laser-ranging (Lidar) and gravitational-field experiments. Although the Lidar instrument was not designed for scientific studies of planetary topography, it provided a near-global topographic data set that is an important advance over our previous knowledge of lunar shape. The single-shot ranging precision of the Lidar was about
The gravity results also improve our understanding of the Moon, though to a lesser degree. The lunar highlands are found to be nearly isostatically compensated, whereas impact basins display a wide range of compensation states that do not correlate simply with basin size or age. The lunar crust is apparently thinned under all resolvable basins. Thus the Moon's structure and thermal history are more complicated than was previously believed.
The data on the far-side gravity field contain useful new findings but are poorly constrained with respect to the precise magnitudes of the anomalies owing to the usual problems associated with the tracking of an intermittently obscured spacecraft. Accordingly, significant uncertainty remains about the lunar gravity field, especially the far-side values and high-spatial resolution data; a future mission (including a subsatellite to allow differential tracking) will be required to complete the global gravitational survey of the Moon. In addition, gravitational observations over an approximately 1-year period will be necessary to unambiguously resolve possible tidal signatures that could indicate the presence (or absence) of a molten deep interior.
Lessons Learned From the Clementine
http://www.nap.edu/html/ssb_html/Clementine/clem-ch2.shtml#geophysics
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