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Comparison of Ionospheric STEC between VLBI and GNSS

Comparison of Ionospheric STEC between VLBI and GNSS. Suxia Gong 1,2 , Robert Heinkelmann 2 , James M. Anderson 1,2 , Susanne Lunz 2 , Jun G. Wang 1,2 , Ming H. Xu 3,1,2,4 , Harald Schuh 1,2 1 Technical University of Berlin, 2 GFZ German Research Centre for Geosciences,

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Comparison of Ionospheric STEC between VLBI and GNSS

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  1. Comparison of Ionospheric STEC between VLBI and GNSS Suxia Gong1,2, Robert Heinkelmann2, James M. Anderson1,2, Susanne Lunz2, Jun G. Wang1,2, Ming H. Xu3,1,2,4, Harald Schuh1,2 1Technical University of Berlin, 2GFZ German Research Centre for Geosciences, 3Huazhong University of Science and Technology, 4Shanghai Astronomical Observatory 2. Study stations Contact: gongsx@gfz-potsdm.de 1. Introduction 3. Approach 4. First results

  2. 1. Introduction For space geodetic techniques operating at microwave frequencies the ionospheric effect is considered as one of the largest error sources.. Most of the existing ionosphere models used in geodesy are based on terrestrial Global Navigation Satellite System (GNSS) measurements. Very Long Baseline Interferometry (VLBI) measures single-difference group delays from radio signals arriving at two or more VLBI telescopes. The ionospheric effect is to first approximation proportional to Slant Total Electron Content (STEC). A comparison between VLBI and GNSS on STEC parameter level is important for quality assessment. Fig 1. VLBI and GNSS two single-difference STEC analysis

  3. 2. Study stations • X/S VLBI ionospheric delay is given in the VLBI observation file provided by the IVS • GNSS code and phase observations are provided by IGS • Ionex file of IGS combined GIMs is given by IGS Fig. 2 Geographical distribution of the two CONT17 networks Reference: http://ivscc.bkg.bund.de/program/cont17 Tips: Zoom in byclicking on it.

  4. 3. Approach • IGS combined GIMs • Vertical Total Electron Content (VTEC) • Resolution • spatial: 5°X 2.5° • temporal: 2 hours • Mapping function: transform VTEC to STEC azimuth match elevation time The instrumental delays are computed using the reference of Hobiger T. et al., 2016

  5. 4. First results • dSTEC between X/S VLBI and GIMs Fig 3. Compare the X/S VLBI differential STEC with the one derived from IGS combined Ionosphere Maps during CONT17

  6. 4. First results--continue • dSTEC between X/S VLBI and GIMs Fig 4. Compare the X/S VLBI differential STEC of baseline KASHIM11-KOKEE with the one derived from IGS combined Ionosphere Maps during CONT17

  7. 4. First results--continue • STEC between GIMs and GNSS observations Fig 5. Compare the GNSS obervation-derived STEC with the one derived from IGS combined Ionosphere Maps

  8. 4. First results--continue • STEC between GIMs and GNSS observations Fig 6. Compare the GNSS obervation derived STEC with the one derived from IGS combined Ionosphere Maps

  9. Fig. 2 Geographical distribution of the two CONT17 networks Reference: http://ivscc.bkg.bund.de/program/cont17

  10. 2-minute madness Comparison of Ionospheric STEC between VLBI and GNSS Suxia Gong1,2, Robert Heinkelmann2, James M. Anderson1,2, Susanne Lunz2, Jun G. Wang1,2, Ming H. Xu3,1,2,4, Harald Schuh1,2 1Technical University of Berlin, 2GFZ German Research Centre for Geosciences, 3Huazhong University of Science and Technology, 4Shanghai Astronomical Observatory 10.04.2019

  11. Very Long Baseline Interferometry (VLBI) • Most of the VLBI stations are co-located with GNSS Fig 1. VLBI and GNSS two single-difference STEC analysis

  12. Fig 2. Compare X/S VLBI differential STEC of baseline KASHIM11-KOKEE with the one derived from IGS combined Ionosphere Maps for 15 days

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