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Direct recovery of mean gravity anomalies from satellite to satellite trackingThe direct recovery was investigated of mean gravity anomalies from summed range rate observations, the signal path being ground station to a geosynchronous relay satellite to a close satellite significantly perturbed by the short wave features of the earth's gravitational field. To ensure realistic observations, these were simulated with the nominal orbital elements for the relay satellite corresponding to ATS-6, and for two different close satellites (one at about 250 km height, and the other at about 900 km height) corresponding to the nominal values for GEOS-C. The earth's gravitational field was represented by a reference set of potential coefficients up to degree and order 12, considered as known values, and by residual gravity anomalies obtained by subtracting the anomalies, implied by the potential coefficients, from their terrestrial estimates. It was found that gravity anomalies could be recovered from strong signal without using any a-priori terrestrial information, i.e. considering their initial values as zero and also assigning them a zero weight matrix. While recovering them from weak signal, it was necessary to use the a-priori estimate of the standard deviation of the anomalies to form their a-priori diagonal weight matrix.
Document ID
19750010748
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hajela, D. P. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1974
Subject Category
Geophysics
Report/Patent Number
REPT-218
NASA-CR-142303
Accession Number
75N18820
Funding Number(s)
OTHER: NGR-36-008-161
PROJECT: OSURF PROJ. 3210
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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