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Evaluation of COMPASS ionospheric grid

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Abstract

As an important component of the augmentation service, the ionospheric grid contributes to improving single-frequency positioning accuracy. The ionospheric delay corrections are broadcast as vertical delay estimates at specified ionospheric grid points (IGPs) for most satellite-based augmentation system, where the IGPs are predefined with a resolution of 5° and 5° in latitude and longitude. Different from the general strategy, the COMPASS IGPs are predefined with a resolution of 2.5° and 5° in latitude and longitude. The need for this special IGPs distribution is investigated with experiments using real data. The performance of the COMPASS ionospheric grid is analyzed in terms of accuracy and availability. Comparing the performance of the special IGPs distribution with that of 5° × 5° IGPs, the results show that the ionospheric correction improves by 0.2 m and the 3D positioning accuracy improves by 1 m in middle-low latitude regions. The RMS of the COMPASS grid ionospheric correction accuracy is better than 0.5 m in most regions of the China mainland, and the availability is better than 95 % except in the northeast, northwest and outside China. In addition, we investigated the performance of the method that combined the inverse distance weighted and spherical harmonics grid modeling algorithm. Simulations show that the new method clearly improves grid availability. The mean availability in the mainland is better than 99 %.

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Acknowledgments

The authors would like to thank the anonymous reviewers for their thoughtful reviews, and Professor Hu, Professor Chen and Doctor Li for their helpful comments. Thanks the IGS official website for the free data download service. This work was supported by the National Natural Science Foundation of China (41204023, 11203059, 41204022, 41174027), the National High Technology Research and Development Program of China (2013AA122402) and China Satellite Navigation Conference Commission (CSNC2012-QY-7).

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Authors and Affiliations

  1. Beijing Satellite Navigation Center, Beijing, 100094, China

    Xiaoli Wu, Jianhua Zhou, Bo Tang & Jiachen Fan

  2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China

    Yueling Cao

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  1. Xiaoli Wu
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  2. Jianhua Zhou
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  3. Bo Tang
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  4. Yueling Cao
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  5. Jiachen Fan
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Correspondence to Xiaoli Wu.

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Wu, X., Zhou, J., Tang, B. et al. Evaluation of COMPASS ionospheric grid. GPS Solut 18, 639–649 (2014). https://doi.org/10.1007/s10291-014-0394-4

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  • DOI: https://doi.org/10.1007/s10291-014-0394-4

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