Výsledky vyhledávání - "Francis J. Lerch"

Gravity model improvement using the DORIS tracking system on the SPOT 2 satellite

Autor: R. G. Williamson, R. S. Nerem, G. B. Patel, Francis J. Lerch, Steven M. Klosko, J. W. Robbins

Publikováno v: Journal of Geophysical Research: Solid Earth. 99:2791-2813

A high-precision radiometric satellite tracking system, Doppler Orbitography and Radio-positioning Integrated by Satellite system (DORIS), has recently been developed by the French space agency, Centre National d'Etudes Spatiales (CNES). DORIS was de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db009d94b82072bccdda46735e3bcfd8
https://doi.org/10.1029/93jb02567

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Expected orbit determination performance for the TOPEX/Poseidon mission

Autor: G. B. Patel, S.B. Luthcke, R. S. Nerem, S.M. Klosko, Erricos C. Pavlis, J. A. Marshall, R. G. Williamson, B. H. Putney, Francis J. Lerch, Nikita P. Zelensky

Publikováno v: IEEE Transactions on Geoscience and Remote Sensing. 31:333-354

The research that has been conducted in the Space Geodesy Branch at NASA/Goddard Space Flight Center in preparation for meeting the 13-cm radial orbit accuracy requirement for the TOPEX/Poseidon (T/P) mission is described. New developments in modelin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5fd51b3706d9f7cbbeb15131b56b40be
https://doi.org/10.1109/36.214910

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New error calibration tests for gravity models using subset solutions and independent data: Applied to GEM-T3

Autor: S. M. Klosko, R. S. Nerem, Francis J. Lerch, D. S. Chinn, J. C. Chan, G. B. Patel

Publikováno v: Geophysical Research Letters. 20:249-252

Orbit error projections based on the error covariance estimates of Goddard Earth Model (GEM)-T3 have been shown to be reliable through their projection on observation residuals within independent data sets. Special geopotential solutions were develop

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e27fc2d7a226f538432248fa4e7ff0a
https://doi.org/10.1029/92gl02824

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An improved error assessment for the GEM-T1 Gravitational Model

Autor: C. A. Wagner, S. M. Klosko, Erricos C. Pavlis, Douglas S. Chinn, James G. Marsh, G. B. Patel, Francis J. Lerch

Publikováno v: Journal of Geophysical Research: Solid Earth. 96:20023-20040

Several tests were designed to determine the correct error variances for the Goddard Earth Model (GEM)-T1 gravitational solution which was derived exclusively from satellite tracking data. The basic method employs both wholly independent and dependen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2e461dfee5ceb7f2ff5a2a0779386dd4
https://doi.org/10.1029/91jb01480

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Optimum data weighting and error calibration for estimation of gravitational parameters

Autor: Francis J. Lerch

Publikováno v: Bulletin Géodésique. 65:44-52

A new approach has been developed for determining consistent satellite-tracking data weights in solutions for the satellite-only gravitational models. The method employs subset least-squares solutions of the satellite data contained within the comple

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::83bd3adb24258dbd24cabf48fb510d5d
https://doi.org/10.1007/bf00806341

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The Joint Gravity Model 3

Autor: Nikolaos K. Pavlis, G. W. Davis, Michael M. Watkins, R. S. Nerem, Hyung-Jin Rim, Richard J. Eanes, S. R. Poole, C. K. Shum, John C Ries, Bob E. Schutz, J. A. Marshall, S. M. Klosko, Francis J. Lerch, R. G. Williamson, Byron D. Tapley

Publikováno v: Journal of Geophysical Research
Scopus-Elsevier

An improved Earth geopotential model, complete to spherical harmonic degree and order 70, has been determined by combining the Joint Gravity Model 1 (JGM 1) geopotential coefficients, and their associated error covariance, with new information from S

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::028405eeb4c546e25708264590065834
https://gfzpublic.gfz-potsdam.de/pubman/item/item_1833997

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Preliminary Results from the Joint GSFC/DMA Gravity Model Project

Autor: R. G. Williamson, J. C. Chan, N. K. Pavlis, R. Trimmer, M. H. Torrence, R. Salman, Steven M. Klosko, Y. M. Wang, Erricos C. Pavlis, Richard H. Rapp, R. S. Nerem, Francis J. Lerch, S. C. Kenyon

Publikováno v: International Association of Geodesy Symposia ISBN: 9783540608820

The NASA Goddard Space Flight Center (GSFC) and the U.S. Defense Mapping Agency (DMA) with the aid of other organizations such as The Ohio State University are cooperating in a joint effort to determine a significantly improved degree 360 spherical h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a7e939bcf9955a5b2e45dfad73e5bae8
https://doi.org/10.1007/978-3-642-61140-7_10

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Alternative Estimation Techniques for Global High-Degree Gravity Modeling

Autor: Joseph C. Chan, Nikolaos K. Pavlis, Francis J. Lerch

Publikováno v: International Association of Geodesy Symposia ISBN: 9783540608820

High-degree (Nmax=360) gravitational models require surface gravity data to resolve the fine structure of the field. Given a global gravity anomaly data set, one can extract this information using either quadrature formulae (orthogonality relations)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e83cb3a5a0e90cf28de762debee39458
https://doi.org/10.1007/978-3-642-61140-7_11

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