An improved error assessment for the GEM-T1 gravitational model

Details An improved error assessment for the GEM-T1 gravitational model An improved error assessment for the GEM-T1 gravitational model

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9620023l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 10, 1991, p. 20,023-20,040.

Physics

12

Earth Gravitation, Error Analysis, Gravitational Fields, Mathematical Models, Satellite Tracking, Geodetic Accuracy, Geopotential, Satellite Altimetry

Scientific paper

Several tests have been designed to estimate the correct error variances for the GEM-T1 gravitational solution that was derived exclusively from satellite tracking data. The basic method uses both independent and dependent subset data solutions and produces a coefficient-by-coefficient estimate of the model uncertainties. The GEM-T1 errors have been further analyzed using a method based on eigenvalue-eigenvector analysis, which calibrates the entire covariance matrix. Dependent satellite data sets and independent altimetric, resonant satellite, and surface gravity data sets all confirm essentially the same error assessment. The calibration test results yield very stable calibration factors, which vary only by approximately 10 percent over the range of tests performed. Based on these calibrated error estimates, GEM-T1 is a significantly improved solution, which to degree and order 8 is twice as accurate as earlier satellite derived models like GEM-L2. Also, by being complete to degree and order 36, GEM-T1 is more complete and has significantly reduced aliasing effects that were present in previous models.

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