Recent Results from CHAMP Tracking and Accelerometer Data Analysis

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Recent Results from CHAMP Tracking and Accelerometer Data Analysis

Luthcke, S. B. / Rowlands, D. D. / Lemoine, F. G. / Nerem, R. S. / Thompson, B. / Pavlis, E. / Williams, T. A. / Colombo, O. L. / Chao, Benjamin F.

Abstract

The 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.

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Document information

Title :

Recent Results from CHAMP Tracking and Accelerometer Data Analysis

Contributors:

Luthcke, S. B. (author) / Rowlands, D. D. (author) / Lemoine, F. G. (author) / Nerem, R. S. (author) / Thompson, B. (author) / Pavlis, E. (author) / Williams, T. A. (author) / Colombo, O. L. (author) / Chao, Benjamin F. (author)

Conference:

European Geophysical Society (EGS) XXVII General Assembly ; 2002 ; Nice, France

Publication date :

2002-01-01

Type of media :

Conference paper

Type of material :

No indication

Language :

English

Keywords :

Geophysics