Sensitivity of LAGEOS orbits to global gravity field models

• Autorzy: Sośnica K. , Thaller D. , Jäggi A. , Dach R. , Beutler G.

Identyfikatory

DOI

10.2478/v10018-012-0013-y

• Języki publikacji: EN

Abstrakty

EN

Precise orbit determination is an essential task when analyzing SLR data. The quality of the satellite orbits strongly depends on the models used for dynamic orbit determination. The global gravity field model used is one of the crucial elements, which has a significant influence on the satellite orbit and its accuracy. We study the impact of different gravity field models on the determination of the LAGEOS-1 and -2 orbits for data of the year 2008. Eleven gravity field models are compared, namely JGM3 and EGM96 based mainly on SLR, terrestrial and altimetry data, AIUB-CHAMP03S based uniquely on GPSmeasurements made by CHAMP, AIUB-GRACE03S, ITG-GRACE2010 based on GRACE data, and the combined gravity field models based on different measurement techniques, such as EGM2008, EIGEN-GL04C, EIGEN51C, GOCO02S, GO-CONS-2-DIR-R2, AIUB-SST. The gravity field models are validated using the RMS of the observation residuals of 7-day LAGEOS solutions. The study reveals that GRACE-based models have the smallest RMS values (i.e., about 7.15 mm), despite the fact that no SLR data were used to determine them. The coefficient C₂₀ is not always well estimated in GRACE-only models. There is a significant improvement of the gravity field models based on CHAMP, GRACE and GOCE w.r.t. models of the pre-CHAMP era. The LAGEOS orbits are particularly sensitive to the long wavelength part of the gravity fields. Differences of the estimated orbits due to different gravity field models are noticeable up to degree and order of about 30. The RMS of residuals improves from about 40 mm for degree 8, to about 7 mm for the solutions up to degrees 14 and higher. The quality of the predicted orbits is studied, as well.

Słowa kluczowe

EN

satellite geodesy; SLR; LAGEOS; orbit determination; Earth gravity field models

• Wydawca: Centrum Badań Kosmicznych PAN ; De Gruyter
• Czasopismo: Artificial Satellites : Journal of Planetary Geodesy
• Rocznik: 2012
• Tom: Vol. 47, No. 2
• Strony: 47--65
• Opis fizyczny: Bibliogr. 41 poz., rys., tab.

Twórcy

autor

Sośnica K.

• Astronomical Institute, University of Bern Sidlerstrasse 5, 3012 Bern, Switzerland

autor

Thaller D.

• Astronomical Institute, University of Bern Sidlerstrasse 5, 3012 Bern, Switzerland

autor

Jäggi A.

• Astronomical Institute, University of Bern Sidlerstrasse 5, 3012 Bern, Switzerland

autor

Dach R.

• Astronomical Institute, University of Bern Sidlerstrasse 5, 3012 Bern, Switzerland

autor

Beutler G.

• Astronomical Institute, University of Bern Sidlerstrasse 5, 3012 Bern, Switzerland

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).