Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977agu..meet.....l&link_type=abstract
Presented at Fall Ann. Meeting of the Am. Geophysical Union, Washington, D. C., Jun. 1977
Astronomy and Astrophysics
Astronomy
Altimeters, Astronomical Models, Gravity Gradiometers, Orbital Position Estimation, Artificial Satellites, Collocation, Data Processing, Error Analysis, Gravity Anomalies, Surface Waves
Scientific paper
The use of collocation permitted GEM 9 to be a larger field than previous derived satellite models, GEM 9 having harmonics complete to 20 x 20 with selected higher degree terms. The satellite data set has approximately 840,000 observations, of which 200,000 are laser ranges taken on 9 satellites equipped with retroreflectors. GEM 10 is complete to 22 x 22 with selected higher degree terms out to degree and order 30 amounting to a total of 592 coefficients. Comparisons with surface gravity and altimeter data indicate a substantial improvement in GEM 9 over previous satellite solutions; GEM 9 is in even closer agreement with surface data than the previously published GEM 6 solution which contained surface gravity. In particular the free air gravity anomalies calculated from GEM 9 and a surface gravity solution are in excellent agreement for the high degree terms.
Klosko Steve M.
Laubscher Roy E.
Lerch F. J.
Wagner Carl A.
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