Volume XLII-3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 167-171, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-167-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 167-171, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-167-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Apr 2018

30 Apr 2018

REAL-TIME TROPOSPHERIC PRODUCT ESTABLISHMENT AND ACCURACY ASSESSMENT IN CHINA

M. Chen1,2,4, J. Guo2, J. Wu1,4, W. Song3,4, and D. Zhang3,4 M. Chen et al.
  • 1National Geomatics Center of China, Beijing, China
  • 2School of Geodesy and Geomatics, Wuhan University, Wuhan, China
  • 3GNSS Research Center, Wuhan University, Wuhan, China
  • 4Key Laboratory of Navigation & Location Based Service, National Administration of Survey, Mapping and Geoinformation, Beijing, China

Keywords: Real-time; Tropospheric delay; GNSS reference stations; Grid product; Accuracy assessment; Convergence speed

Abstract. Tropospheric delay has always been an important issue in Global Navigation Satellite System (GNSS) processing. Empirical tropospheric delay models are difficult to simulate complex and volatile atmospheric environments, resulting in poor accuracy of the empirical model and difficulty in meeting precise positioning demand. In recent years, some scholars proposed to establish real-time tropospheric product by using real-time or near-real-time GNSS observations in a small region, and achieved some good results. This paper uses real-time observing data of 210 Chinese national GNSS reference stations to estimate the tropospheric delay, and establishes ZWD grid model in the country wide. In order to analyze the influence of tropospheric grid product on wide-area real-time PPP, this paper compares the method of taking ZWD grid product as a constraint with the model correction method. The results show that the ZWD grid product estimated based on the national reference stations can improve PPP accuracy and convergence speed. The accuracy in the north (N), east (E) and up (U) direction increase by 31.8 %,15.6 % and 38.3 %, respectively. As with the convergence speed, the accuracy of U direction experiences the most improvement.