NASA NTRS · 19900011202
An improved error assessment for the GEM-T1 gravitational model
Abstract
Several tests were designed to determine the correct error variances for the GEM-T1 gravitational solution which was derived exclusively from satellite tracking data. The basic method employs both wholly independent and dependent subset data solutions and produces a full field coefficient by coefficient estimate of the model uncertainties. The GEM-T1 errors were further analyzed using a method based upon eigenvalue-eigenvector analysis which calibrates the entire covariance matrix. Dependent satellite and independent altimetric and surface gravity data sets, as well as independent satellite deep resonance information, confirm essentially the same error assessment.
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Lerch, F. J., Marsh, J. G., Klosko, S. M., Pavlis, E. C., Patel, G. B., Chinn, D. S., Wagner, C. A.. 1989-06-01. An improved error assessment for the GEM-T1 gravitational model. https://ntrs.nasa.gov/citations/19900011202
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