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Gravitational field modes GEM 3 and 4A refinement in the satellite geopotential solution for a Goddard Earth Model (GEM 3) was obtained. The solution includes the addition of two low inclination satellites, SAS at 3 deg and PEOLE at 15 deg, and is based upon 27 close earth satellites containing some 400,000 observations of electronic, laser, and optical data. In addition, a new combination satellite/gravimetry solution (GEM 4) was derived. The new model includes 61 center of mass tracking station locations with data from GRARR, Laser, MOTS, Baker-Nunn, and NWL Tranet Doppler tracking sites. Improvement was obtained for the zonal coefficients of the new models and is shown by tests on the long period perturbations of the orbits. Individual zonal coefficients agree very closely among different models that contain low inclination satellites. Tests of models with surface gravity data show that the GEM 3 satellite model has significantly better agreement with the gravimetry data than the GEM 1 satellite model, and that it also has better agreement with the gravimetry data than the 1969 SAO Standard Earth 2 model.
Document ID
19730012156
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lerch, F. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wagner, C. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Putney, B. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sandson, M. L. (Computer Sci. Corp.)
Brownd, J. E. (Computer Sci. Corp.)
Richardson, J. A. (Computer Sci. Corp.)
Taylor, W. A. (Computer Sci. Corp.)
Date Acquired
September 2, 2013
Publication Date
November 1, 1972
Subject Category
Space Vehicles
Report/Patent Number
NASA-TM-X-66207
X-592-72-476
Meeting Information
Meeting: Intern. Symp. on Earth Gravity Models and Related Problems
Location: St. Louis, MO
Country: United States
Start Date: August 16, 1972
End Date: August 18, 1972
Accession Number
73N20883
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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