Journal of Astronautics ›› 2020, Vol. 41 ›› Issue (9): 1195-1203.doi: 10.3873/j.issn.1000-1328.2020.09.010

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Quality Control Method for ZTD Modeling Based on GNSS Observation Data

DING Jun sheng  , CHEN Jun ping  , WANG Jun gang   

  1. 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; 2. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China; 3. Department of Geodesy, GeoForschungsZentrum(GFZ), Potsdam 14473, Germany
  • Received:2019-10-14 Revised:2019-11-22 Online:2020-09-15 Published:2020-09-27

Abstract: Aiming at the lack of effective quality control for the troposphere zenith total delay (ZTD) modeling based on GNSS observation data, a ZTD modeling quality control method that takes into account data volume, grid resolution, and model stability is proposed. Using the high spatial resolution GNSS ZTD data of 183 stations in Germany and surrounding regions [47°N-55°N, 5°E-15°E] in the last ten years, calculated by the Nevada Geodetic Laboratory, the method has been verified. The experimental results show that the new model established under this quality control method has stable accuracy, and the average root mean square error (RMS) is 3.4 cm, with 42.4%, 35.8% and 33.3% being improved as compared with UNB3m, EGNOS, and GPT2w+Saas respectively. The proposed quality control method helps to improve the performance of ZTD modeling and could be provided as a reference approach for ZTD modeling research.

Key words: Zenith Total Delay (ZTD), Quality control, GNSS, Nevada Geodetic Laboratory (NGL)

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