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Estimation of GPS LNAV based on IGS products for real-time PPP

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Abstract

Precise satellite orbit and clock corrections are essential to precise point positioning (PPP). The standard GPS legacy navigation (LNAV) message disseminated by the satellite is one of the most widely used sources for deriving orbit and clock corrections in real-time using efficient analytical user algorithms. However, the quality of the satellite orbit and clock corrections computed with the standard LNAV is not adequate for real-time PPP mainly due to the low update rate. In this study, we proposed an improved LNAV which is estimated based on the IGS ultra-rapid (IGU) orbit and real-time service (RTS) clock products. Two advantages characterize this improved LNAV message. The first one is that scalable update rates can be used for disseminating satellite orbit and clock corrections. Users can decide to receive and decode the improved LNAV message at the desired update rate considering the availability of correction streams, communication bandwidth, and targeted accuracy. With sufficiently high update rates, the improved LNAV can be applied for high-precision applications such as real-time PPP. The second advantage is that the legacy user algorithms can be maintained for computing real-time satellite orbit and clock corrections. Since the improved LNAV has the same parameter representation as the standard LNAV, no changes are required at the user algorithms. To validate the proposed method, the quality of real-time orbit and clock corrections computed with the improved LNAV, IGU products, Centro Nacional de Estudios Espaciales (CNES) real-time products, and the standard LNAV is compared, while the IGS final products are used as the reference. The numerical results indicate that the improved LNAV can achieve comparable orbit accuracy as CNES real-time products, while the clock accuracy highly depends on the update rate. A globally distributed network of 40 IGS stations is used to assess the kinematic PPP performance. Using the improved LNAV with update intervals of 5 min, an average positioning accuracy of 0.122, 0.100, and 0.242 m at 95% confidence level can be obtained in the east, north, and up directions, respectively. Even when the update intervals extend to 2 h, the positioning accuracy is still about 1.2 times better than that of using IGU products. The proposed method provides a scalable and flexible way to improve the standard LNAV for real-time PPP users.

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Acknowledgements

The IGS and CNES are acknowledged for providing the GNSS products. The study is partly supported by National Natural Science Foundation of China (Nos. 41774038, 41804034). The first author is funded by the China Scholarship Council and the Natural Sciences and Engineering Research Council of Canada (NSERC) which are also acknowledged. The authors also thank the editor and the anonymous reviewers for their helpful suggestions.

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Authors and Affiliations

  1. Department of Geomatics Engineering, University of Calgary, Calgary, Canada

    Peiyuan Zhou, Hongzhou Yang & Yang Gao

  2. Geodetic Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany

    Guorui Xiao

  3. Zhengzhou Institute of Surveying and Mapping, Zhengzhou, China

    Guorui Xiao & Lan Du

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  1. Peiyuan Zhou
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  2. Hongzhou Yang
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  3. Guorui Xiao
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  4. Lan Du
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  5. Yang Gao
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Correspondence to Lan Du.

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Zhou, P., Yang, H., Xiao, G. et al. Estimation of GPS LNAV based on IGS products for real-time PPP. GPS Solut 23, 27 (2019). https://doi.org/10.1007/s10291-018-0820-0

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