Abstract
In this chapter the theory and details of the implementation and validation of the GPS carrier phase wind-up correction and the GPS attitude model are presented. It is shown, that a correction of the carrier phase data due to the wind-up effect improves the GPS orbit fit together with the integer ambiguity fixing by 1–2 cm. It is also demonstrated, that changing the definition of the X-axis of the Block IIR satellites (towards Sun as for Block IIA) has no significant influence on orbits and clocks when integer ambiguity fixing is applied, since the difference due to the different axes definitions is completely absorbed by floating L3 ambiguities. The phase wind-up correction was also applied for one week of data for the Low Earth Orbiters CHAMP, GRACE-A and TerraSAR-X. The orbit improvement, measured by Satellite Laser Ranging (SLR) residuals is noticeable and amounts to 3 mm globally. The description of the GPS attitude model, including shadow crossing and post-shadow manoeuvre, noon and midnight turns is given in detail. It is demonstrated, that incorrect attitude modelling can cause yaw angle errors exceeding even the size of one full rotation of the satellite during the shadow crossing.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Bar-Sever YE (1996) A new model for GPS yaw attitude. JoG 70, 714–723.
Ge M, Gendt G, Dick G, Zhang FP (2005) Improving carrier-phase ambiguity resolution in global GPS network solution. J. Geod., doi: 10.1007/s00190-005-0447–0.
Kouba J (2008) A simplified yaw-attitude model for eclipsing GPS satellites. GPS Solut., doi: 10.1007/s10291-008-0092-1.
Wu JT, Wu SC, Hajj GA, Bertiger WI, Lichten SM (1993) Effect of antenna orientation on GPS carier phase. Manuscripta Geodaetica 18, 91–98.
Acknowledgments
We would like to thank IGS for providing GPS data, ILRS for providing SLR data and IERS for providing Earth Orientation Parameters. This study was carried out in the Geotechnologien programme under the grant of the German Federal Ministry of Education and Research.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Michalak, G., König, R. (2010). Improvements for the CHAMP and GRACE Observation Model. In: Flechtner, F., et al. System Earth via Geodetic-Geophysical Space Techniques. Advanced Technologies in Earth Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10228-8_3
Download citation
DOI: https://doi.org/10.1007/978-3-642-10228-8_3
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-10227-1
Online ISBN: 978-3-642-10228-8
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)