Výsledky vyhledávání - "Joseph B. Nicholas"

Autor: David D. Rowlands, T. Thomas, T. A. Pennington, Scott B. Luthcke, Joseph B. Nicholas

Publikováno v: Earth and Space Science, Vol 8, Iss 4, Pp n/a-n/a (2021)

The ICESat‐2 Precision Orbit Determination (POD) system computes the precise position of the laser altimeter instrument in inertial space, a measurement necessary for accurate geolocation of individual photon surface returns. ICESat‐2 POD solutio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01b749580ddca36b11fb011f27c0daf4
https://doi.org/10.1029/2020ea001496

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ICESat‐2 Pointing Calibration and Geolocation Performance

Autor: Alex S. Gardner, Joseph B. Nicholas, David D. Rowlands, T. A. Pennington, Scott B. Luthcke, T. Thomas, Sungkoo Bae, T. W. Rebold

Publikováno v: Earth and Space Science, Vol 8, Iss 3, Pp n/a-n/a (2021)

ICESat‐2 science requirements are dependent on the accurate real‐time pointing control (i.e., geolocation control) and postprocessed geolocation knowledge of the laser altimeter surface returns. Prelaunch pointing alignment errors and postlaunch

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24102ea500a1fd7b47478b45ba9834b9
https://doaj.org/article/00989bdce3da47a182aa1d407cce9260

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ICESat-2 Precision Orbit Determination Performance

Autor: Scott B. Luthcke, David D. Rowlands, T. Thomas, Joseph B. Nicholas, T. A. Pennington, T. W. Rebold

The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission launched on September 15th, 2018, with the primary goal of measuring ice sheet topographic change. The fundamental measurement used to achieve mission science objectives is the geoloca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9487768f1d69ad04b4cd7c8dc71acb97
https://doi.org/10.5194/egusphere-egu2020-10780

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Advanced illumination modeling for data analysis and calibration. Application to the Moon

Autor: Erwan Mazarico, Michael K. Barker, Joseph B. Nicholas

Publikováno v: Advances in Space Research. 62:3214-3228

We present a new illumination modeling tool, called IllumNG, developed at NASA Goddard Space Flight Center (GSFC). We describe its capabilities to enhance the analysis and calibration of science data collected by planetary missions. We highlight thes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db26971c7e8de786c0e8cfc9531172a0
https://doi.org/10.1016/j.asr.2018.08.022

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Evidence for a low bulk crustal density for Mars from gravity and topography

Autor: Gregory A. Neumann, Terence J. Sabaka, Sander Goossens, Joseph B. Nicholas, Antonio Genova, Erwan Mazarico

Publikováno v: Geophysical Research Letters. 44:7686-7694

Knowledge of the average density of the crust of a planet is important in determining its interior structure. The combination of high-resolution gravity and topography data has yielded a low density for the Moon’s crust, yet for other terrestrial p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf9e82c7d302a8978b6cf27ea588916a
https://doi.org/10.1002/2017gl074172

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Recovery of Bennu's Orientation for the OSIRIS-REx Mission: Implications for the Spin State Accuracy and Geolocation Errors

Autor: David D. Rowlands, Joseph B. Nicholas, David Parry Rubincam, Michael C. Moreau, Erwan Mazarico, K. Getzandanner, Terence J. Sabaka

The goal of the OSIRIS-REx mission is to return a sample of asteroid material from Near-Earth Asteroid (101955) Bennu. The role of the navigation and flight dynamics team is critical for the spacecraft to execute a precisely planned sampling maneuver

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cfbd396b2afddd79657ae4e9da69758
http://arxiv.org/abs/1704.05108

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GRGM900C: A degree 900 lunar gravity model from GRAIL primary and extended mission data

Autor: Frank G. Lemoine, Gregory A. Neumann, David E. Smith, Erwan Mazarico, David D. Rowlands, Joseph B. Nicholas, Maria T. Zuber, Douglas S. Chinn, Terence J. Sabaka, Bryant D. Loomis, Sander Goossens

Publikováno v: Geophysical Research Letters
American Geophysical Union

We have derived a gravity field solution in spherical harmonics to degree and order 900, GRGM900C, from the tracking data of the Gravity Recovery and Interior Laboratory (GRAIL) Primary (1 March to 29 May 2012) and Extended Missions (30 August to 14

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::171ec28369f65c222f020f9e2b3b8141
http://europepmc.org/articles/PMC4459205

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The effect of seasonal and long-period geopotential variations on the GPS orbits

Autor: Frank G. Lemoine, Joseph B. Nicholas, S. Melachroinos, Brian D. Beckley, Nikita P. Zelensky, Douglas S. Chinn

Publikováno v: GPS Solutions. 18:497-507

We examine the impact of using seasonal and long-period time-variable gravity field (TVG) models on GPS orbit determination, through simulations from 1994 to 2012. The models of time-variable gravity that we test include the GRGS release RL02 GRACE-d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da2c974224ebe44b9f3f29db523cea98
https://doi.org/10.1007/s10291-013-0346-4

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