+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + NASA Center + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Marsh, J. G. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 120 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order Prev 1 2 3 4 5 6 7 8 9 10 Next >> 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 Prev 1 2 3 4 5 6 7 8 9 10 Next >> + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007