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Assessment of vertical TEC mapping functions for space-based GNSS observations

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Abstract

The mapping function is commonly used to convert slant to vertical total electron content (TEC) based on the assumption that the ionospheric electrons concentrate in a layer. The height of the layer is called ionospheric effective height (IEH) or shell height. The mapping function and IEH are generally well understood for ground-based global navigation satellite system (GNSS) observations, but they are rarely studied for the low earth orbit (LEO) satellite-based TEC conversion. This study is to examine the applicability of three mapping functions for LEO-based GNSS observations. Two IEH calculating methods, namely the centroid method based on the definition of the centroid and the integral method based on one half of the total integral, are discussed. It is found that the IEHs increase linearly with the orbit altitudes ranging from 400 to 1400 km. Model simulations are used to compare the vertical TEC converted by these mapping functions and the vertical TEC directly calculated by the model. Our results illustrate that the F&K (Foelsche and Kirchengast) geometric mapping function together with the IEH from the centroid method is more suitable for the LEO-based TEC conversion, though the thin layer model along with the IEH of the integral method is more appropriate for the ground-based vertical TEC retrieval.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (41325017, 41274157, 41174139 and 41121003), the Project of Chinese Academy of Sciences (KZZD-EW-01), National Key Basic Research Program of China (2012CB825605) and Thousand Young Talents Program of China.

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Authors and Affiliations

  1. CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China

    Jiahao Zhong, Jiuhou Lei & Xiankang Dou

  2. Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, China

    Jiahao Zhong, Jiuhou Lei & Xiankang Dou

  3. Collaborative Innovation Center of Astronautical Science and Technology, Harbin, China

    Jiuhou Lei & Xiankang Dou

  4. COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA

    Xinan Yue

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  1. Jiahao Zhong
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  2. Jiuhou Lei
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  3. Xiankang Dou
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  4. Xinan Yue
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Correspondence to Jiuhou Lei or Xiankang Dou.

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Zhong, J., Lei, J., Dou, X. et al. Assessment of vertical TEC mapping functions for space-based GNSS observations. GPS Solut 20, 353–362 (2016). https://doi.org/10.1007/s10291-015-0444-6

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