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Recent Results from CHAMP Tracking and Accelerometer Data AnalysisThe CHAMP mission's unique combination of sensors and orbit configuration will enable unprecedented improvements in modeling and understanding the Earth's static gravity field and its temporal variations. CHAMP is the first of two missions (GRACE to be launched in the early part of 02') that combine a new generation of Global Positioning System (GPS) receivers, a high precision three-axis accelerometer, and star cameras for the precision attitude determination. In order to isolate the gravity signal for science investigations, it is necessary to perform a detailed reduction and analysis of the GPS and Satellite Laser Ranging (SLR) tracking data in conjunction with the accelerometer and attitude data. Precision orbit determination based on the GPS and SLR tracking data will isolate the orbit perturbations, while the accelerometer data will be used to distinguish the non-gravitational forces from those due to the geopotential (static, and time varying). In preparation for the CHAMP and GRACE missions, extensive modifications have been made to NASA/GSFC's GEODYN orbit determination software to enable the simultaneous reduction of spacecraft tracking (e.g. GPS and SLR), three-axis accelerometer and precise attitude data. Several weeks of CHAMP tracking and accelerometer data have been analyzed and the results will be presented. Precision orbit determination analysis based on tracking data alone in addition to results based on the simultaneous reduction of tracking and accelerometer data will be discussed. Results from a calibration of the accelerometer will be presented along with the results from various orbit determination strategies.
Document ID
20020067782
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Luthcke, S. B.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Rowlands, D. D.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Lemoine, F. G.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Nerem, R. S.
(Colorado Univ. United States)
Thompson, B.
(Colorado Univ. United States)
Pavlis, E.
(Raytheon Information Technology and Scientific Services Lanham, MD United States)
Williams, T. A.
(Raytheon Information Technology and Scientific Services Lanham, MD United States)
Colombo, O. L.
(Maryland Univ. Baltimore County Catonsville, MD United States)
Chao, Benjamin F.
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Geophysics
Meeting Information
Meeting: European Geophysical Society (EGS) XXVII General Assembly
Location: Nice
Country: France
Start Date: April 21, 2002
End Date: April 26, 2002
Sponsors: European Geophysical Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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