سازمان نقشه برداري كشور GPS و تاخير ترويوسفريك تر جهت برآورد بخار آب موجود در اتمسفر مطالعه موردي : برآورد بخار آب موجود در اتمسفر در ايستگاه دايمي GPS استفاده از

Computation of the Water Vapor of the Atmosphere by GPS Case study: Computation of the Water Vapor at the Permanent GPS Station of the National Cartographic Center of Iran

In this paper application of GPS observation for determination of water vapor of the Earthʹs atmosphere has been studied based on 4 permanent GPS stations, namely, PERM (in Iran), BAHR (in Bahrain), KIT3 (in Kazakhstan), and NSSP (in Armenia). The obtainable accuracy of the water vapor by GPS has been investigated by comparison of the computed Zenith Total Delay (ZTD) in this study at the KIT3 station by that computed by International GPS Service (IGS). The results of the comparison ensuring the success of atmospheric water vapor determination by GPS and as such the presented methodology can be readily applied at all existing permanent GPS station of the country and those that would be established in future. Since so far there has been no permanent station for the observation of the water vapor in Iran, the results of this study provides the possibility of using the permanent GPS stations, in addition to their geodynamic and positioning missions for the meteorological applications.