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Verification of the accuracy of GEM-L2 in response to criticism by Lambeck and ColemanThe objective was to evaluate the accuracy of the Goddard Earth Model (GEM)-L2 and its improvement in estimating Lageos orbits in order to provide better baselines for plate tectonics, improved polar motion and Earth rotation. Analyses and comparisons with other models are made to verify accuracy in contrast to the Lambeck and Coleman result which denied the authors' accuracy estimates. The analysis presented completely verifies the accuracy of the GEM-L2 model and disproves the statistical methods of Lambeck and Coleman rejecting the accuracy of GEM-L2 as published in their report. The baselines derived from Lageos with GEM-L2 were estimated to have a 2 cm uncertainty due to the errors in the GEM-L2 gravity model which is supported by the results given. The calibration tests indicate that the errors in GEM-L2 should be reduced by about 30 percent which is in the opposite direction to the result obtained by Lambeck and Coleman.
Document ID
19840022397
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Lerch, F. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Publication Information
Publication: Res. Activities of the Geodyn. Branch
Subject Category
Astrodynamics
Accession Number
84N30466
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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