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There are a total of 120 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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An improved error assessment for the GEM-T1 gravitational model
Author(s): Lerch, F. J.; Marsh, J. G.; Klosko, S. M.; Pavlis, E. C.; Patel, G. B.; Chinn, D. S.; Wagner, C. A.
Abstract: Several tests were designed to determine the correct error variances for the GEM-T1 gravitational solution which was derived exclusively from satellite tracking data. The basic method employs both wholly independent and ...
NASA Center: Goddard Space Flight Center Publication Year: 1989
Added to NTRS: 2008-05-31
Accession Number: 90N20518; Document ID: 19900011202
Evaluation of the Goddard range and range rate system at Rosman by intercomparison with Geos-1 long arc orbital solutions
Author(s): Lerch, F. J.; Marsh, J. G.; Oneill, B.
Abstract: Long arc orbital solutions from Geos-1 satellite used to evaluate range and range rate tracking system
NASA Center: Goddard Space Flight Center Publication Year: 1967
Added to NTRS: 2008-05-28
Accession Number: 68N21660; Document ID: 19680012191; Report Number: NASA-TM-X-63159, X-552-68-72
Gravity model comparison using Geos-1 long arc orbital solutions
Author(s): Lerch, F. J.; Marsh, J. G.; Oneill, B.
Abstract: Gravity model comparison using Geos-1 long arc orbital solutions
NASA Center: Goddard Space Flight Center Publication Year: 1967
Added to NTRS: 2008-05-28
Accession Number: 68N21594; Document ID: 19680012125; Report Number: NASA-TM-X-63158, X-552-68-71
Geos-1 station tracking positions on the SAO standard earth /C-5/
Author(s): Brooks, R. L.; Daria, M. D.; Lerch, F. J.; Marsh, J. G.
Abstract: Geodetic and Cartesian station coordinates on SAO C-5 standard earth for Geos tracking stations
NASA Center: Goddard Space Flight Center Publication Year: 1967
Added to NTRS: 2008-05-28
Accession Number: 68N21720; Document ID: 19680012251; Report Number: NASA-TM-X-63157, X-552-68-70
Intercomparison of the minitrack and optical tracking networks using Geos-1 long arc orbital solutions, part 1
Author(s): Doll, C. E.; Marsh, J. G.; Sandifer, R. J.; Taylor, W. A.
Abstract: Minitrack measurements compared to optically determined orbit for calibrating Minitrack antenna arrays
NASA Center: Goddard Space Flight Center Publication Year: 1967
Added to NTRS: 2008-05-28
Accession Number: 68N21577; Document ID: 19680012108; Report Number: NASA-TM-X-63161, X-552-68-105
Tests and comparisons of gravity models using camera observations of GEOS 1 and Geos 2
Author(s): Douglas, B. C.; Dutcher, M. L.; Marsh, J. G.
Abstract: Modification to geopotential models based on GEOS 1 and 2 optical tracking data
NASA Center: Goddard Space Flight Center Publication Year: 1970
Added to NTRS: 2007-10-23
Accession Number: 70N33218; Document ID: 19700023907; Report Number: NASA-TM-X-63972, X-552-70-48
A detailed gravimetric geoid of North America, the North Atlantic, Eurasia, and Australia
Author(s): Marsh, J. G.
Abstract: A computer program was developed for the calculation of a goid based upon a combination of satellite and surface gravity data. A detailed gravimetric geoid of North America, the North Atlantic, Eurasia, and Australia was ...
NASA Center: Goddard Space Flight Center Publication Year: 1973
Added to NTRS: 2006-08-02
Accession Number: 73N31910; Document ID: 19730023178
An intercomparison of some results from Geos-1 data based upon SECOR short arc vs. optical long arc reference orbits
Author(s): Lerch, F. J.; Marsh, J. G.; Moss, S. J.; Oneill, B.
Abstract: Comparing measured ranges from range rate tracking systems with optical reference orbits
NASA Center: Goddard Space Flight Center Publication Year: 1968
Added to NTRS: 2006-08-02
Accession Number: 68N23523; Document ID: 19680014054; Report Number: NASA-TM-X-63199, X-552-68-101
Tests and comparisons of different sets of geopotential coefficients for orbit determination and prediction
Author(s): Marsh, J. G.
Abstract: Orbit calculations and predictions by different sets of geopotential coefficients for GEOS satellites
NASA Center: Goddard Space Flight Center Publication Year: 1970
Added to NTRS: 2006-08-02
Accession Number: 71N25302; Document ID: 19710015826
An improved model of the Earth's gravitational field: GEM-T1
Author(s): Marsh, J. G.; Lerch, F. J.; Christodoulidis, D. C.; Putney, B. H.; Felsentreger, T. L.; Sanchez, B. V.; Smith, D. E.; Klosko, S. M.; Martin, T. V.; Pavlis, E. C.
Abstract: Goddard Earth Model T1 (GEM-T1), which was developed from an analysis of direct satellite tracking observations, is the first in a new series of such models. GEM-T1 is complete to degree and order 36. It was developed using ...
NASA Center: Goddard Space Flight Center Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N29967; Document ID: 19870020534; Report Number: NAS 1.15:4019, NASA-TM-4019, REPT-87B0451
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