Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-18T11:00:20.795Z Has data issue: false hasContentIssue false
  • English
  • Français

A Troposphere Constraint Method To Improve PPP Ambiguity-Resolved Height Solution

Published online by Cambridge University Press:  08 October 2013

Junbo Shi  and
Yang Gao
Junbo Shi*
Affiliation:
(School of Geodesy and Geomatics, Wuhan University, China) (Department of Geomatics Engineering, University of Calgary, Canada)
Yang Gao
Affiliation:
(Department of Geomatics Engineering, University of Calgary, Canada) (School of Geomatics, Liaoning Technical University, China)
*
(E-mail: [email protected])
Get access Rights & Permissions [Opens in a new window]

Abstract

Integer ambiguity resolution is able to improve positioning accuracy and reduce convergence time in Precise Point Positioning (PPP). Although significantly improved horizontal positioning accuracy has been demonstrated, the height solution improvement is found to be less significant, and improving this requires further investigation. In this paper, a troposphere constraint method using precise troposphere corrections is proposed to improve the PPP ambiguity-resolved height solution. This is different from the conventional approach that typically applies meteorological data to calculate the a priori troposphere delay and estimates the residual troposphere delay. The effects of the troposphere delay on PPP ambiguity-resolved height solutions are first studied. Numerical analysis is conducted to ambiguity-resolved positioning results based on the decoupled clock model and hourly Global Positioning System (GPS) observations from a Canadian PPP-inferred troposphere precipitable water vapour system. The results show that by using the proposed method the PPP ambiguity-resolved height accuracy can be further improved to 3·86 cm compared to 5·32 cm using the conventional approach.

Keywords

PPP integer ambiguity resolutionAmbiguity-resolved height solutionTroposphere constraint methodDecoupled clock model
Type
Research Article
Information
The Journal of Navigation , Volume 67 , Issue 2 , March 2014 , pp. 249 - 262
Copyright
Copyright © The Royal Institute of Navigation 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Byun, S. and Bar-Sever, Y. (2009). A new type of troposphere zenith path delay product of the International GNSS Service. Journal of Geodesy, 83(3–4), 367–373.Google Scholar
Collins, P. (2008). Isolating and estimating un-differenced GPS integer ambiguities. Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, 720–732.Google Scholar
Collins, P., Lahaye, F., Heroux, P. and Bisnath, S. (2008). Precise point positioning with ambiguity resolution using the decoupled clock model. Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, 1315–1322.Google Scholar
Collins, P., Henton, J., Mireault, Y., Héroux, P., Schmidt, M., Dragert, H., and Bisnath, S. (2009). Precise point positioning for real-time determination of co-seismic crustal motion. Proceedings of the 22nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, 2479–2488.Google Scholar
Collins, P., Bisnath, S., Francois, L., and Héroux, P. (2010). Undifferenced GPS ambiguity resolution using the decoupled clock model and ambiguity datum fixing. Journal of Navigation, 57, 123–135.Google Scholar
Ge, M., Gendt, G., Rothacher, M., Shi, C. and Liu, J. (2008). Resolution of GPS carrier-phase ambiguities in precise point positioning (PPP) with daily observations. Journal of Geodesy, 82(7), 389–399.CrossRefGoogle Scholar
Geng, J., Teferle, F., Shi, C., Meng, X., Dodson, A. and Liu, J. (2009). Ambiguity resolution in precise point positioning with hourly data. GPS Solutions, 13(4), 263–270.Google Scholar
Gérard, P. and Luzum, B. (2010). IERS Conventions 2010. http://www.iers.org/nn_11216/SharedDocs/Publikationen/EN/IERS/Publications/tn/TechnNote36/tn36,templateId=raw,property=publicationFile.pdf/tn36.pdf. Accessed 27 April 2012.Google Scholar
Laurichesse, D., Mercier, F., Berthias, J. and Bijac, J. (2008). Real time zero-difference ambiguities blocking and absolute RTK. Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, 747–755.Google Scholar
Schmid, R., Steigenberger, P., Gendt, G., Ge, M. and Rothacher, M. (2007). Generation of a consistent absolute phase center correction model for GPS receiver and satellite antennas. Journal of Geodesy, 81(12), 781–798.Google Scholar
Shi, J. and Gao, Y. (2012). Improvement of PPP-inferred tropospheric estimates by integer ambiguity resolution. Advances in Space Research, 50(10), 1374–1382.Google Scholar
Tétreault, P., Kouba, J., Héroux, P. and Legree, P. (2005). CSRS-PPP: an internet service for GPS user access to the Canadian spatial reference frame. Geomatica, 59(1), 17–28.Google Scholar
Tregoning, P. and Herring, T. (2006). Impact of a priori zenith hydrostatic delay errors on GPS estimates of station heights and zenith total delay. Geophysical Research Letters, 33, L23303.Google Scholar