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Influence of the GLONASS inter-frequency bias on differential code bias estimation and ionospheric modeling

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Abstract

Due to the application of frequency division multiple access, the signals of GLONASS satellites suffer from code and carrier phase inter-frequency biases (IFBs). In this study, the effects of GLONASS code IFBs on differential code bias (DCB) estimation and ionospheric modeling are investigated. The observational data from more than 130 MGEX stations for a period of 60 days are used to generate the DCB products, with and without considering the GLONASS code IFB. According to the results, residuals of the DCB estimation without GLONASS code IFB consideration exhibit frequency-dependent systematic errors, errors that can be eliminated when the GLONASS code IFB is taken into account. The GLONASS inter-frequency differential code bias (IFDCB), defined as the difference of the sum of satellite and receiver DCB estimates without and with GLONASS code IFB consideration, is taken to represent the difference between the two DCB estimation types. The IFDCBs are generally in the range of ±4 and ±2 ns for C1P–C2P and C1C–C1P, respectively, and the largest difference of the C1P–C2P IFDCBs between frequency channels is >7 ns. The VTEC products of ionospheric modeling with and without the consideration of the GLONASS code IFB are also generated based on data from 30 days of MGEX and IGS networks. The mean difference and standard deviation between them are 0.53–1.13 and 0.98–1.75 TECU, respectively.

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Acknowledgements

We would like to acknowledge the IGS, MGEX, CODE, DLR, and IGG for providing access to GNSS data and DCB products. This study is supported by National Natural Science Foundation of China (Grant No. 41474025), the Surveying and Mapping Foundation Research Fund Program, National Administration of Surveying, Mapping and Geoinformation (Grant No. 14-02-09), the Open Foundation of Key Laboratory of Precise Engineering and Industry Surveying of National Administration of Surveying, Mapping and Geoinformation (Grant No. PF2015-5), and the Program for Changjiang Scholars of the Ministry of Education of China.

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Authors and Affiliations

  1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China

    Xiaohong Zhang, Weiliang Xie, Xiaodong Ren & Keke Zhang

  2. Collaborative Innovation Center for Geospatial Technology, 129 Luoyu Road, Wuhan, 430079, Hubei, China

    Xiaohong Zhang

  3. German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473, Potsdam, Germany

    Xingxing Li

  4. GPS Research Center, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China

    Weiping Jiang

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  1. Xiaohong Zhang
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  2. Weiliang Xie
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  3. Xiaodong Ren
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  5. Keke Zhang
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Correspondence to Xiaodong Ren.

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Zhang, X., Xie, W., Ren, X. et al. Influence of the GLONASS inter-frequency bias on differential code bias estimation and ionospheric modeling. GPS Solut 21, 1355–1367 (2017). https://doi.org/10.1007/s10291-017-0618-5

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  • DOI: https://doi.org/10.1007/s10291-017-0618-5

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