Computer Science
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sosyr..38..449k&link_type=abstract
Solar System Research, Volume 38, Issue 6, pp.449-454
Computer Science
4
Scientific paper
We consider the spatial-temporal properties of the speckle patterns formed when coherent radio waves are scattered by planets. At a speckle diameter of only a few kilometers, the speckle patterns are shown to be displaced in “frozen” form by distances larger than the Earth’s diameter due to the spin-orbital motion; i.e., long-range coherence of the radar field takes place. We estimate the coherence losses of the echo signals from Mercury due to the decorrelation of the patterns, which do not exceed or comparable to 10-4 in order of magnitude for ground-based interferometers. Such small losses imply a high degree of “frozenness” of the speckle pattern everywhere within the Earth, i.e., on a global scale. This allows us to formulate and solve the unprecedented problems of precision measurements of the instantaneous spin vector components for terrestrial planets by using radars distributed all over the globe.
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