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High-resolution gravity model of VenusThe anomalous gravity field of Venus shows high correlation with surface features revealed by radar. We extract gravity models from the Doppler tracking data from the Pioneer Venus Orbiter by means of a two-step process. In the first step, we solve the nonlinear spacecraft state estimation problem using a Kalman filter-smoother. The Kalman filter has been evaluated through simulations. This evaluation and some unusual features of the filter are discussed. In the second step, we perform a geophysical inversion using a linear Bayesian estimator. To allow an unbiased comparison between gravity and topography, we use a simulation technique to smooth and distort the radar topographic data so as to yield maps having the same characteristics as our gravity maps. The maps presented cover 2/3 of the surface of Venus and display the strong topography-gravity correlation previously reported. The topography-gravity scatter plots show two distinct trends.
Document ID
19930026562
Document Type
Reprint (Version printed in journal)
Authors
Reasenberg, R. D. (NASA Headquarters Washington, DC United States)
Goldberg, Z. M. (Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
September 25, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: E9
ISSN: 0148-0227
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAGW-409
CONTRACT_GRANT: NAGW-1438
CONTRACT_GRANT: NAGW-2361
Distribution Limits
Public
Copyright
Other