Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | International Symposium on Advancing Geodesy in a Changing World |
| Untertitel | Proceedings of the IAG Scientific Assembly, Kobe, Japan, July 30 – August 4, 2017 |
| Herausgeber/-innen | Laura Sánchez, Jeffrey T. Freymueller |
| Herausgeber (Verlag) | Springer Verlag |
| Seiten | 97-104 |
| Seitenumfang | 8 |
| ISBN (Print) | 9783030129149 |
| Publikationsstatus | Veröffentlicht - 1 Nov. 2018 |
| Veranstaltung | Joint Scientific Assembly of the International Association of Geodesy and International Association of Seismology and Physics of the Earth’s Interior, IAG-IASPEI 2017 - Kobe, Japan Dauer: 30 Juli 2017 → 4 Aug. 2017 |
Publikationsreihe
| Name | International Association of Geodesy Symposia |
|---|---|
| Band | 149 |
| ISSN (Print) | 0939-9585 |
| ISSN (elektronisch) | 2197-9359 |
Abstract
Two approaches for the calibration of GRACE (Gravity Recovery And Climate Experiment) accelerometers are revisited. In the first approach, surface forces acting on the satellite are considered to derive the reference acceleration. In the second approach, the total acceleration consisting of a gravitational and a non-gravitational contribution is first determined from the reduced-dynamic orbits. The approximation of discrete satellite positions by a polynomial function allows the total acceleration to be obtained by a twofold derivative w.r.t. time. Calibration parameters (scale factor and bias) and statistical values are estimated for periods with a low and high solar activity. The quality of these two approaches shows dependencies on solar activity and consequent variations in the magnitude of the non-gravitational reference acceleration. Besides, the quality of the presented results is affected by the orientation of the orbital plane w.r.t. the Sun. The second approach is vitiated by a periodic disturbing signal on cross-track axis. This signal has been pointed out in earlier studies (Calabia et al., Aerosp Sci Technol 45, 2015; Calabia and Jin, Aerosp Sci Technol 49, 2016). We apply a moving window median filter to recover the underlying non-gravitational signal for accelerometer calibration. The calibration is accomplished by a direct comparison of reference accelerations and observed accelerometer measurements without introducing any a priori values or constraints. The focus of this work is more sensor oriented than gravity field recovery (GFR) related. Nevertheless, the results can be used as initial values for precise orbit determination (POD) or for pre-processing of accelerometer measurements in a multi step gravity field recovery approach (Klinger and Mayer-Gürr, Adv Space Res 58(9), 2016).
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Computer in den Geowissenschaften
- Erdkunde und Planetologie (insg.)
- Geophysik
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International Symposium on Advancing Geodesy in a Changing World : Proceedings of the IAG Scientific Assembly, Kobe, Japan, July 30 – August 4, 2017. Hrsg. / Laura Sánchez; Jeffrey T. Freymueller. Springer Verlag, 2018. S. 97-104 (International Association of Geodesy Symposia; Band 149).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - Calibration of GRACE Accelerometers Using Two Types of Reference Accelerations
AU - Koch, Igor
AU - Shabanloui, Akbar
AU - Flury, Jakob
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Two approaches for the calibration of GRACE (Gravity Recovery And Climate Experiment) accelerometers are revisited. In the first approach, surface forces acting on the satellite are considered to derive the reference acceleration. In the second approach, the total acceleration consisting of a gravitational and a non-gravitational contribution is first determined from the reduced-dynamic orbits. The approximation of discrete satellite positions by a polynomial function allows the total acceleration to be obtained by a twofold derivative w.r.t. time. Calibration parameters (scale factor and bias) and statistical values are estimated for periods with a low and high solar activity. The quality of these two approaches shows dependencies on solar activity and consequent variations in the magnitude of the non-gravitational reference acceleration. Besides, the quality of the presented results is affected by the orientation of the orbital plane w.r.t. the Sun. The second approach is vitiated by a periodic disturbing signal on cross-track axis. This signal has been pointed out in earlier studies (Calabia et al., Aerosp Sci Technol 45, 2015; Calabia and Jin, Aerosp Sci Technol 49, 2016). We apply a moving window median filter to recover the underlying non-gravitational signal for accelerometer calibration. The calibration is accomplished by a direct comparison of reference accelerations and observed accelerometer measurements without introducing any a priori values or constraints. The focus of this work is more sensor oriented than gravity field recovery (GFR) related. Nevertheless, the results can be used as initial values for precise orbit determination (POD) or for pre-processing of accelerometer measurements in a multi step gravity field recovery approach (Klinger and Mayer-Gürr, Adv Space Res 58(9), 2016).
AB - Two approaches for the calibration of GRACE (Gravity Recovery And Climate Experiment) accelerometers are revisited. In the first approach, surface forces acting on the satellite are considered to derive the reference acceleration. In the second approach, the total acceleration consisting of a gravitational and a non-gravitational contribution is first determined from the reduced-dynamic orbits. The approximation of discrete satellite positions by a polynomial function allows the total acceleration to be obtained by a twofold derivative w.r.t. time. Calibration parameters (scale factor and bias) and statistical values are estimated for periods with a low and high solar activity. The quality of these two approaches shows dependencies on solar activity and consequent variations in the magnitude of the non-gravitational reference acceleration. Besides, the quality of the presented results is affected by the orientation of the orbital plane w.r.t. the Sun. The second approach is vitiated by a periodic disturbing signal on cross-track axis. This signal has been pointed out in earlier studies (Calabia et al., Aerosp Sci Technol 45, 2015; Calabia and Jin, Aerosp Sci Technol 49, 2016). We apply a moving window median filter to recover the underlying non-gravitational signal for accelerometer calibration. The calibration is accomplished by a direct comparison of reference accelerations and observed accelerometer measurements without introducing any a priori values or constraints. The focus of this work is more sensor oriented than gravity field recovery (GFR) related. Nevertheless, the results can be used as initial values for precise orbit determination (POD) or for pre-processing of accelerometer measurements in a multi step gravity field recovery approach (Klinger and Mayer-Gürr, Adv Space Res 58(9), 2016).
KW - Accelerometry
KW - GRACE
KW - Satellite accelerometer calibration
UR - http://www.scopus.com/inward/record.url?scp=85064759746&partnerID=8YFLogxK
U2 - https://doi.org/10.15488/4961
DO - https://doi.org/10.15488/4961
M3 - Conference contribution
AN - SCOPUS:85064759746
SN - 9783030129149
T3 - International Association of Geodesy Symposia
SP - 97
EP - 104
BT - International Symposium on Advancing Geodesy in a Changing World
A2 - Sánchez, Laura
A2 - Freymueller, Jeffrey T.
PB - Springer Verlag
T2 - Joint Scientific Assembly of the International Association of Geodesy and International Association of Seismology and Physics of the Earth’s Interior, IAG-IASPEI 2017
Y2 - 30 July 2017 through 4 August 2017
ER -