Mathematics – Logic
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ssrv..151...49z&link_type=abstract
Space Science Reviews, Volume 151, Issue 1-3, pp. 49-60
Mathematics
Logic
Micro-Propulsion System, Identification, Parameter Estimation, Drag-Free System, Test Mass
Scientific paper
Propulsion system characteristics determine to a large extent the dynamic behavior of a spacecraft. For many future science missions technologically novel micro-propulsion systems are required. In order to support its characterization, in-orbit experiments and subsequent data processing on ground can be an appropriate add-on to ground-based laboratory measurements. In this paper two identification methods for three major thruster parameters, thrust gain, thrust direction, and lever arm, are presented and compared. They are based on measurements of a precise inertial instrument that consists of two test masses, whose degrees of freedom are “mixed” with respect to its control principle, i.e. they are either drag-free controlled (free-flying) or suspension controlled (accelerometer mode). Using drag-free coordinates is a novel approach. It is related and compared to the more conventional approach using “accelerometer-like” measurements.
Fichter Walter
Ziegler Tobias
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