Overview of Swarm Accelerometer Data Quality
C Siemes (European Space Agency (ESA))
G Apelbaum (Leibniz Universität)
Eelco Doornbos (TU Delft - Astrodynamics & Space Missions)
J. De Teixeira Da Encarnação (TU Delft - Astrodynamics & Space Missions)
J Flury (Leibniz Universität)
L Grunwaldt (GFZ Helmholtz-Zentrum für Geoforschung)
PE Holmdahl Olsen (Technical University of Denmark (DTU))
J Kraus (Serenum)
Radek Pereštý (Serenum)
S Svitlov (Leibniz Universität)
Jose van den IJssel (TU Delft - Astrodynamics & Space Missions)
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Abstract
The Swarm satellites carry accelerometers as part of their scientific payload. These instruments measure the non-gravitational acceleration due to forces like drag or radiation pressure acting on the spacecraft, from which thermospheric neutral densities and potentially winds can be derived. Unfortunately, the acceleration measurements suffer from a variety of perturbations, the most prominent being slow temperature-induced bias variations and sudden bias changes. Other less prominent perturbation includes spikes and artificial periodic signals. Though all perturbation are visible in the measurements of all Swarm accelerometers, their severity is much different for the three Swarm satellites. In this presentation, we illustrate all known disturbances and assess their severity for scientific exploitation of the accelerometer data separately for each Swarm satellite.
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