An Improved Model of the Earth's Gravitational Field: *GEM-TI*
gr • Q NASA Technical Memorandum 4019 An Improved Model of the Earth's Gravitational Field: *GEM-TI* J. G. Marsh, F. J. Lerch, B. H. Putney, D. C. Christodoulidis, T. L. Felsentreger, B. V. Sanchez, D. E. Smith, S. M. Klosko, T. V. Martin, E. C. Pavlis, J. W. Robbins, R. G. Williamson, O. L. Colombo, N. L. Chandler, K. E. Rachlin, G. B. Patel, S. Bhati, and D. S. Chinn N87-29967 {NASA-TM-_019| AN IMPROVED MODEL OF THE EAETH'S GRAVITATIONAL FIELD: GE_-TI 'NASA) 351 p Avail: NTIS HC A|6/MF A01 CSCL 08G Unclas Hi/_6 00998_3 JULY 1987 NASA I I NASA Technical Memorandum 4019 An Improved Model of the Earth's Gravitational Field: *GEM-TI* J. G. Marsh, F. J. Lerch, B. H. Putney, D. C. Christodoulidis, T. L. Felsentreger, B. V. Sanchez, and D. E. Smith Geodynamics Branch S. M. Klosko, T. V. Martin, E. C. Pavlis, J. W. Robbins, R. G. Williamson, O. L. Colombo, N. L. Chandler, and K. E. Rachlin EG&G Washington Analytical Services Center, Inc. G. B. Patel, S. Bhati, and D. S. Chinn Science Applications and Research Corporation JULY 1987 National Aeronautics and Space Administration Goddard Space Flight Center 1987 TABLE OF CONTENTS INTRODUCTION ............................... 1 THE GEODYN AND SOLVE SYSTEMS • ° ° ° ° ..... ° ° ° • ° ° • • o ° 9 2.1 SOFTWARE DESCRIPTION ..................... 9 Vectorization of SOLVE .............. 11 Evolution of GEODYN ................ 12 GEODYN II Design Philosophy . 13 GEODYN II Benefits ......... 20 2.1.3 GEODYN II, SOLVE and the TOPEX Gravity Models ........................ 21 2.2 OPERATIONS .... ° ................... ° • ° 25 3.0 REFERENCE FRAME • • . ........ ° • . • . ..... • • • .... 29 3.1 INTRODUCTION .........................
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