Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-25T19:01:17.630Z Has data issue: false hasContentIssue false
  • English
  • Français

Impact of New GPS Signals on Positioning Accuracy for Urban Bus Operations

Published online by Cambridge University Press:  15 June 2020

Mireille Elhajj  and
Washington Ochieng
Mireille Elhajj
Affiliation:
(Astra-Terra Limited, London, United Kingdom)
Washington Ochieng*
Affiliation:
(Centre for Transport Studies, Imperial College London, London, United Kingdom)
*
(E-mail: [email protected])
Get access Rights & Permissions [Opens in a new window]

Abstract

This paper analyses for the first time the impact of new GPS signals on positioning accuracy for dynamic urban applications, taking bus operations as an example. The performance assessment addresses both code measurement precision and positioning accuracy. The former is based on signal-to-noise ratio and estimation of multipath and noise by a combination of code and carrier phase measurements. The impact on positioning accuracy is derived by comparing the performance achievable with the conventional single frequency GPS only positioning both relative to reference trajectories from the integration of carrier phase measurements with data from a high grade inertial measurement unit. The results show that L5 code measurements have the highest precision, followed by L1 C/A and L2C. In the positioning domain, there is a significant improvement in two-dimensional and three-dimensional accuracy from dual frequency code measurements over the single frequency measurements, of 39% and 48% respectively, enabling more bus operation services to be supported.

Keywords

Urban Bus OperationsLocation Based ServicesGPSPositioning Accuracy
Type
Research Article
Information
The Journal of Navigation , Volume 73 , Issue 6 , November 2020 , pp. 1284 - 1305
Check for updates
Copyright
Copyright © The Royal Institute of Navigation 2020

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

Cai, C., He, C., Santerre, R., Pan, L., Cui, X. and Zhu, J. (2016). A comparative analysis of measurement noise and multipath for four constellations: GPS, BeiDou, GLONASS and Galileo. Survey Review, 48(349), 287–295.CrossRefGoogle Scholar
Elhajj, M. (2017). The impact of the new GPS signals on positioning accuracy for urban bus location based services. Ph.D. thesis, Imperial College London.Google Scholar
Engel, U. (2008). A Theoretical Performance Analysis of the Modernized GPS Signals. IEEE/ION Position, Location and Navigation Symposium, Monterey, CA, 1067–1078, DOI: 10.1109/PLANS.2008.4570114.10.1109/PLANS.2008.4570114CrossRefGoogle Scholar
Fontana, R. D., Cheung, W., Novak, P. M. and Stanstell, T. A. (2001). The New L2C Civil Signal. Proceedings of ION 2001, Salt Lake City, UT.Google Scholar
NovAtel (2016). OEM6 Family Receiver reference manual. Available at: http://www.NovAtel.com/assets/Documents/Manuals/om-20000129.pdfGoogle Scholar
Saleem, T., Usman, M., Elahi, A. and Gul, N. (2017). Simulation and performance evaluations of the new GPS L5 and L1 signals. Wireless Communications and Mobile Computing, 2017, 1–4. DOI: 10.1155/2017/7492703.10.1155/2017/7492703CrossRefGoogle Scholar
Sanz Subirana, J., Juan Zornoza, J. M. and Hernandez-Pajares, M. (2013). GNSS data processing – volume I: fundamentals and algorithms. European Space Agency, 223. https://gssc.esa.int/navipedia/GNSS_Book/ESA_GNSS-Book_TM-23_Vol_I.pdf.Google Scholar
Sükeová, L., Santos, M. C., Langley, R. B., Leandro, R. F., Nnani, O. and Nievinski, F. (2007). GPS L2C Signal Quality Analysis. Proceedings of the 63rd Annual Meeting of the US Institute of Navigation (ION), Cambridge, MA, 23–25.Google Scholar
Tran, M. (2004). Performance evaluations of the new GPS L5 and L2 civil (L2C) signals. Navigation, 51(3), 199–212.CrossRefGoogle Scholar
UN. (2017). World Population Prospects: The 2017 Revision. Available at: https://population.un.org/wpp/Publications/Files/WPP2017_KeyFindings.pdf.Google Scholar
UN. (2018). 2018 World Urbanization Prospects. Available at: https://population.un.org/wup/Publications/Files/WUP2018-KeyFacts.pdfUS.Google Scholar