An Improved Global Zenith Tropospheric Delay Model

doi:10.11947/j.AGCS.2015.20140089

Acta Geodaetica et Cartographica Sinica ›› 2015, Vol. 44 ›› Issue (3): 242-249.doi: 10.11947/j.AGCS.2015.20140089

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An Improved Global Zenith Tropospheric Delay Model

YAO Yibin^1,2, HU Yufeng¹, YU Chen¹

1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China

Received:2014-02-19 Revised:2014-07-27 Online:2015-03-20 Published:2015-04-01
Supported by:
National Natural Science Foundation of China (Nos.41174012;41274022);The National High Technology Research and Development Program of China (No.2013AA122502);The Program for New Century Excellent Talents in University(No.NCET-12-0428);The Fundamental Research Funds for the Central Universities(No.2014214020202);The Basic Research Foundation of National Administration of Surveying, Mapping and Geoinformation of China(No.13-02-09)

Abstract

Abstract: The time resolution of GZTD model developed by Yao^[16] is 24 hours. To further improve the time resolution of GZTD model, we used the time series of global 4D-grid ZTD from 2002 to 2009, provided by GGOS atmosphere, to construct model according to the 6 hours resolution, and then calculated the ZTD at any time using the cubic spline interpolation method. Thus we developed an improved higher time resolution (6h) GZTD model (GZTD-6h). Analyzing the inner coincidence of two models comparatively, we found that GZTD-6h model (bias: 0.17 cm, RMS: 3.9 cm) performs better than GZTD model (bias: 0.17 cm, RMS: 4.4 cm). Using ZTD time series from global International GNSS Service (IGS) sites to analyze outer coincidence, the statistical results shows that GZTD-6h model (bias:-0.22 cm, RMS: 4.05 cm) improves significantly, compared with GZTD model (bias:-0.45 cm, RMS: 4.51 cm).

Key words: zenith tropospheric delay, GZTD model, time resolution, GZTD-6h model

CLC Number:

P228

YAO Yibin, HU Yufeng, YU Chen. An Improved Global Zenith Tropospheric Delay Model[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(3): 242-249.

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An Improved Global Zenith Tropospheric Delay Model

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