Evaluation of the Precision of Three Tropospheric Delay Correction Models |
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Authors: | Wei-Jing Qu Wen-Yao Zhu Shu-Li Song Jin-Song Ping |
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Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. Graduate School of Chinese Academy of Sciences, Beijing 100039 |
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Abstract: | Using the annual GPS observational tropospheric zenith delay data and meteorological data obtained at 36 globally distributed IGS stations in 2003, we have estimated the accuracy and range of application of two often-used models of tropospheric delay correction (the Hopfield and Saastamoinen models), and of a more recent model (the EGNOS model). We point out some defects in the Hopfield model and show that the EGNOS model can be used as the correction model of the tropospheric zenith delay for the GNSS real-time positioning and navigation. |
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Keywords: | astrometry |
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