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Three-frequency BDS precise point positioning ambiguity resolution based on raw observables

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Abstract

All BeiDou navigation satellite system (BDS) satellites are transmitting signals on three frequencies, which brings new opportunity and challenges for high-accuracy precise point positioning (PPP) with ambiguity resolution (AR). This paper proposes an effective uncalibrated phase delay (UPD) estimation and AR strategy which is based on a raw PPP model. First, triple-frequency raw PPP models are developed. The observation model and stochastic model are designed and extended to accommodate the third frequency. Then, the UPD is parameterized in raw frequency form while estimating with the high-precision and low-noise integer linear combination of float ambiguity which are derived by ambiguity decorrelation. Third, with UPD corrected, the LAMBDA method is used for resolving full or partial ambiguities which can be fixed. This method can be easily and flexibly extended for dual-, triple- or even more frequency. To verify the effectiveness and performance of triple-frequency PPP AR, tests with real BDS data from 90 stations lasting for 21 days were performed in static mode. Data were processed with three strategies: BDS triple-frequency ambiguity-float PPP, BDS triple-frequency PPP with dual-frequency (B1/B2) and three-frequency AR, respectively. Numerous experiment results showed that compared with the ambiguity-float solution, the performance in terms of convergence time and positioning biases can be significantly improved by AR. Among three groups of solutions, the triple-frequency PPP AR achieved the best performance. Compared with dual-frequency AR, additional the third frequency could apparently improve the position estimations during the initialization phase and under constraint environments when the dual-frequency PPP AR is limited by few satellite numbers.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 41474025, 41374035, 41304005).

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Authors and Affiliations

  1. School of Geodesy and Geomatics (SGG), Wuhan University, Wuhan, China

    Pan Li & Xiaohong Zhang

  2. German Research Centre for Geosciences (GFZ), Telegrafenberg, Potsdam, Germany

    Pan Li, Maorong Ge & Harald Schuh

  3. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China

    Xiaohong Zhang

  4. Collaborative Innovation Center for Geospatial Technology, Wuhan, China

    Xiaohong Zhang

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  1. Pan Li
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  2. Xiaohong Zhang
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  3. Maorong Ge
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  4. Harald Schuh
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Correspondence to Xiaohong Zhang.

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Li, P., Zhang, X., Ge, M. et al. Three-frequency BDS precise point positioning ambiguity resolution based on raw observables. J Geod 92, 1357–1369 (2018). https://doi.org/10.1007/s00190-018-1125-3

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