GNSS-based calibration of GRACE accelerometers

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dc.identifier.uri Koch, Igor ger Shabanloui, Akbar ger Flury, Jakob ger Müller, Jürgen ger 2019-03-25T12:30:20Z 2019-03-25T12:30:20Z 2017-07-30
dc.identifier.citation Koch, I.; Shabanloui, A.; Flury, J.; Müller, J.: GNSS-based calibration of GRACE accelerometers. IAG Symposia (2017). ger
dc.description.abstract In this study, two approaches for the determination of total non-gravitational accelerations acting on GRACE were investigated. To investigate two approaches, GRACE Level-1B data including accelerometer sensor data, GNSS based positions and star camera data was used. In the first approach, usual surface accelerations acting on the satellite were taken into account. In a second approach, the total acceleration, consisting of a gravitational and non-gravitational contribution, was first determined from the GNSS-based precise orbit data by means of smoothing polynomial and differentiation. Then the gravitational contribution determined by state of art models was removed to determine the non-gravitational part. The results of these two methods were used to calibrate the linear acceleration measurements on-board GRACE. Daily constraint-free biases and scale factors were determined for two time periods including three month data with a different solar activity. The quality of the results, especially of the second approach is highly dependent on the solar activity and therefore the magnitude of the non-gravitational reference acceleration. The results show that calibration parameters for along track direction can be determined more precise without any information about satellite properties and atmospheric conditions. Constraints have to be applied to get more realistic calibration parameters for axes with a smaller contribution. ger
dc.language.iso eng ger
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. ger
dc.subject Accelerometer calibration eng
dc.subject GNSS eng
dc.subject GRACE eng
dc.subject Beschleunigungssensor ger
dc.subject Kalibrierung ger
dc.subject GNSS ger
dc.subject GRACE ger
dc.subject.ddc 629,1 | Luft- und Raumfahrttechnik ger
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title GNSS-based calibration of GRACE accelerometers ger
dc.type ConferenceObject ger
dc.type Text ger
dc.description.version publishedVersion ger
tib.accessRights frei zug�nglich ger

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