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|Other Titles:||GPS real-time estimation of precipitable water vapor-Hong Kong experiences|
|Authors:||Chen, YQ |
|Keywords:||Precipitable water vapor|
|Source:||測繪学报 (Acta geodetica et cartographica sinica), Feb. 2007, v. 36, no. 1, p. 9-12, 25 How to cite?|
|Journal:||測繪学报 (Acta geodetica et cartographica sinica)|
Since 1998 we have conducted GPS meteorology research to develop the methodology for accurate and real-time determination of PWV with GPS measurements at Hong Kong GPS active stations.The implementation system has been put in practical use in the Hong Kong Observatory for three years.This paper discusses some issues in this development,in particular the measures to improve the accuracy of real time GPS-derived PWV.These measures include the inclusion of a gradient model in the determination of Total Zenith Delay(TZD),calibration of Dry Zenith Delay(DZD) calculation model,and estimation of a local conversion factor for the transformation of derived Wet Zenith Delay(WZD) to PWV.Importance for the identification and elimination of those satellites with large predicted orbital errors is demonstrated.Tests are also conducted to compare two GPS data processing approaches,the Double Differencing(DD) method and Precise Point Positioning(PPP) method.
To improve the accuracy of GPS derived PWV,several measures should be adopted,including the inclusion of a gradient model in the determination of TZD,calibration of DZD computation model,and estimation of local conversion factor.At the same time,the results of PWV with IGS prediction orbits and precise orbits are generally of small difference,but the bad satellite orbits can significantly degrade the estimated accuracy of PWV with IGS predicted orbits and must be eliminated in the nearly real-time application.Additionally,the tests indicate that both DD and PPP data processing approaches in general provide consistent results,but there exists a bias.Further research and comparison should be conducted.
|Rights:||© 2007 中国学术期刊电子杂志出版社。本内容的使用仅限于教育、科研之目的。|
© 2007 China Academic Journal Electronic Publishing House. It is to be used strictly for educational and research use.
|Appears in Collections:||Journal/Magazine Article|
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Checked on Aug 21, 2017
Checked on Aug 21, 2017
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