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On the improvements of the single point positioning accuracy with Locata technology

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Abstract

This work focuses on the performances of Locata technology in single point positioning using different firmware versions (v2.0 and v4.2). The main difference is that the Locata transmitters with firmware v2.0 are single frequency, whereas in the v4.2, they are dual frequency. The performance of the different firmware versions has been measured in different environments including an urban canyon-like environment and a more open environment on the roof of the Nottingham Geospatial Building. The results obtained with firmware v4.2 show that with more available signals, cycle slips can be more easily detected, together with the improvement of the detection of multipath fading on the received signal. As a result, the noise level on the carrier phase measurements recorded with firmware v4.2 is equal on average to a third of the level of noise on the measurements recorded with firmware v2.0. In addition, with either firmware, the accuracy of the position is at the sub-centimeter level on the East and North coordinates. The Up coordinate accuracy is generally less accurate and more sensitive to the geometry of the network in our experiments. We then show the importance of the geometry of the Locata network on the accuracy of Locata positioning system through the demonstration of the relationship between the dilution of precision value and the confidence ellipse. We also demonstrate that the model of the noise on the Locata coordinates is a white Gaussian noise with the help of the autocorrelation function. To some extent, this technique can help to detect whether the Wi-Fi technology is interfering with the Locata technology and degrades the positioning accuracy.

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Acknowledgments

The authors thank the UK Government’s Technology Strategy Board, which funded part of this research and the Australian Research Council (DP0877381). In addition, they also acknowledge the comments from LOCATA Corp. (in particular Dr. Joel Barnes) and the anonymous reviewers when preparing this manuscript.

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Authors and Affiliations

  1. Earth Physics (Geodesy and Geodynamics), Research School of Earth Sciences, The Australian National University, Canberra, Australia

    Jean-Philippe Montillet

  2. Nottingham Geospatial Institute (NGI), The University of Nottingham, Nottingham, UK

    Lukasz K. Bonenberg & Craig M. Hancock

  3. Faculty of Science and Engineering, The University of Nottingham Ningbo, Ningbo, China

    Gethin W. Roberts

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  1. Jean-Philippe Montillet
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  2. Lukasz K. Bonenberg
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  3. Craig M. Hancock
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  4. Gethin W. Roberts
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Correspondence to Jean-Philippe Montillet.

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Montillet, JP., Bonenberg, L.K., Hancock, C.M. et al. On the improvements of the single point positioning accuracy with Locata technology. GPS Solut 18, 273–282 (2014). https://doi.org/10.1007/s10291-013-0328-6

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  • DOI: https://doi.org/10.1007/s10291-013-0328-6

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