CAKAO: Combined analysis of kinematic orbits and loading observations to determine mass redistribution (2016-2018)

CAKAO logo

The project CAKAO focused on the improvement of time-variable gravity field information by consistent combination of two different measurement techniques. Gravity field estimates derived from GPS tracking of low Earth orbit satellites were augmented by incorporating observations of station displacements on ground. Permanently operating GPS stations worldwide provide highly accurate measurements of loading-induced displacements, which were used to supplement and improve the satellite based measurements. Especially for continental areas, which are of high interest for different applications, e.g. hydrology, an improvement in terms of accuracy was achieved.

Results

Kinematic orbit solutions can be found in the download section:

Kinematic orbits

Based on these kinematic orbit products different gravity field solutions have been computed. The main goal is to provide a time series of monthly gravity field solutions. Gravity field solutions can be found in the download section:

Gravity Field Solutions

GNSS products (station positions, GPS satellite orbits, GPS satellite clocks) processed in the scope of this project and gravity field solutions derived from a combination of kinematic orbits and ground station displacements are available via FTP:

FTP download

Acknowledgements

This project is funded within the Austrian Space Applications Program (ASAP) Phase XII by the Austrian Research Promotion Agency (FFG).

References

Zehentner, N. (2017) Kinematic orbit positioning applying the raw observation approach to observe time variable gravity. Dissertation, Graz University of Technology, Graz, Austria

Strasser, S., Mayer-Gürr, T. (2016) Precise orbit determination of GNSS satellites using the raw observation approach. Presentation at Geodätische Woche 2016, Hamburg, Germany

Mayer-Gürr T., Zehentner N. (2016) Time variable gravity observed by GPS derived orbit positions. Presentation at SPP-1788 Dynamic Earth - First Colloquium, Bonn, Germany

Strasser, S., Zehentner, N., Mayer-Gürr, T. (2017) Global GNSS processing based on the raw observation approach. Presentation at European Geosciences Union General Assembly 2017, Vienna, Austria

Strasser, S., Zehentner, N., Mayer-Gürr, T. (2017) Global GNSS processing based on the raw observation approach. Presentation at IAG-IASPEI Joint Scientific Assembly 2017, Kobe, Japan

Zehentner, N., Mayer-Gürr, T., Strasser, S. (2017) Time variable gravity from kinematic orbits of LEO satellites – A 15+ years series of monthly solutions without gaps. Presentation at IAG-IASPEI Joint Scientific Assembly 2017, Kobe, Japan

De Teixeira da Encarnação J., Visser P.N.A.M., Doornbos E., van den IJssel J., Mao X., Iorfida E., Arnold D., Jäggi A., Meyer U., Bezdek A., Sebera J., Klokocnik J., Ellmer, M., Mayer-Gürr, T., Zehentner, N., Guo J.-Y., Luk P., Shum C.K., Zhang Y. (2018) Signal contents of combined monthly gravity field models derived from Swarm GPS data. Presentation at European Geosciences Union General Assembly 2018, Vienna, Austria

Strasser, S., Mayer-Gürr, T., Zehentner, N. (2018) GNSS processing with the raw observation approach in the context of gravity field recovery. Presentation at European Geosciences Union General Assembly 2018, Vienna, Austria

Jäggi A., Meyer U, Schreiter L., Sterken V., Dahle C., Arnold D., De Teixeira da Encarnação J., Visser P.N.A.M., van den IJssel J., Mao X., Iorfida E., Bezdek A., Sebera J., Zehentner, N. , Mayer-Gürr, T., Shum C.K., Lück C., Rietbroek R., Kusche J. (2018) Assessment of individual and combined gravity field solutions from Swarm GPS data and mitigation of systematic errors. Presentation at European Geosciences Union General Assembly 2018, Vienna, Austria

De Teixeira da Encarnação J, Arnold D, Ales B, Dahle C, Doornbos E, van den IJssel J, Jäggi A, Mayer-Gürr T, Sebera J, Shum CK, Visser P, Zehentner N. (2017) Gravity field models derived from Swarm GPS data. Poster presented at European Geosciences Union General Assembly 2017, Vienna, Austria.

Strasser, S., Zehentner, N., Mayer-Gürr, T. (2017) Global GNSS processing based on the raw observation approach. Poster presented at IGS Workshop 2017, Paris, France

Weigelt M., Jäggi A., Meyer U., Arnold D., Grahsl A., Mayer-Gürr, T., Zehentner, N., Steffen H., Tourian M., Dahle C., Flechtner F., Sosnica K., Devaraju B., Vishwakarma B.D., Sneeuw N. (2018) HL-SST and SLR - bridging the gap between GRACE and GRACE-Follow On. Poster presented at European Geosciences Union General Assembly 2018, Vienna, Austria

Zehentner, N., Ellmer, M., Mayer-Gürr, T., Arnold, D., Meyer, U., Jäggi, A., Mao, X., van den IJssel, J., Visser, P., Iorfida, E., Ales, B., Sebera, J., Klokocnik, J., Guo, J., Shum, C., De Teixeira da Encarnação, J. (2018) Investigations of GNSS-derived baselines for gravity field recovery. Poster presented at European Geosciences Union General Assembly 2018, Vienna, Austria


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Contact
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Sebastian Strasser
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873-6349
Fax: +43/316/873-6845
sebastian.strassernoSpam@tugraz.at

Norbert Zehentner
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43/316/873-6344
Fax: +43/316/873-6845
zehentnernoSpam@tugraz.at

Torsten Mayer-Gürr
Steyrergasse 30/III
8010 Graz
Austria
Tel: +43 316 873-6359
Fax: +43 316 873-6845
mayer-guerrnoSpam@tugraz.at