An Improved Model of the Earth's Gravitational Field: GEM-T1National Aeronautics and Space Administration, Goddard Space Flight Center, 1987 - Artificial satellites in earth sciences - 354 pages GEM-T1 (Goddard Earth Model) a model which has been developed from an analysis of direct satellite tracking observations, is the first in this series of models produced. GEM-T1 is complete to degree and order 36. |
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ADJUSTED DATA altimeter altimetry amplitude analysis ARGUMENT OF PERIGEE BASE RMS MAXEL BE-C BIAS SIGMA calibration coefficients coordinate system Cyber data arcs data sets degree and order DI-D Doppler data earth orientation parameters errors estimated factor Figure FIT RMS BASE force model GEM-T1 solution geodetic geopotential global gravimetry gravity anomalies gravity field gravity model gravity solution GRAZI GSFC HHMMSS NPTS ITER improvement LAGEOS laser data Lerch low inclination matrix NASA normal equations normal matrices observations obtained ocean tide orbital characteristics partial derivatives PERIGEE AT EPOCH period perturbations POINTS THIS STATION polar motion residuals RMS BASE RMS RMS OF UNADJUSTED satellite data satellite-only Schwiderski SEASAT Semi-major axis solar radiation pressure SOLVE spherical harmonic STARLETTE station coordinates STATIONS ARGUMENT Table tailored model tidal TOPEX gravity modeling TOTAL POINTS tracking data tracking stations transformation values vector processing WEIGHTED RMS ARCSEC/2 YYMMDD HHMMSS NPTS