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ITG: A New Global GNSS Tropospheric Correction Model.

Yibin Yao1, Chaoqian Xu2, Junbo Shi2

  • 11] School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, China [2] Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, 129 Luoyu Road, Wuhan, 430079, China.

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|July 22, 2015
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A new tropospheric correction model, the Improved Tropospheric Grid (ITG), enhances Global Navigation Satellite System (GNSS) accuracy. ITG outperforms existing models by incorporating detailed atmospheric variations for better Zenith Total Delay estimations.

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Area of Science:

  • Geodesy
  • Atmospheric Science
  • Satellite Navigation

Background:

  • Tropospheric correction models are vital for Global Navigation Satellite System (GNSS) accuracy.
  • Existing models like GPT2 and TropGrid2 have limitations.
  • Accurate tropospheric parameter estimation is crucial for geodetic applications.

Purpose of the Study:

  • To analyze the strengths and weaknesses of current tropospheric models.
  • To develop and introduce an improved tropospheric grid model (ITG).
  • To enhance the accuracy of tropospheric delay estimations in GNSS.

Main Methods:

  • Developed the Improved Tropospheric Grid (ITG) model.
  • ITG incorporates annual, semi-annual, and diurnal atmospheric variations.
  • Estimated diurnal variation parameters as periodic functions, providing temperature, pressure, weighted mean temperature (Tm), and Zenith Wet Delay (ZWD).

Main Results:

  • Compared ITG against existing models using meteorological data from 698 stations.
  • Validated performance against Zenith Total Delay (ZTD) products from 280 International GNSS Service (IGS) stations.
  • Assessed Tm accuracy using Global Geodetic Observing System (GGOS) products.

Conclusions:

  • The ITG model demonstrates superior performance compared to previous models.
  • ITG offers improved accuracy for tropospheric parameter estimations.
  • The developed model is a significant advancement for GNSS applications requiring high precision.