Evaluation of SWEPOS second-order GNSS network stations for monitoring tropospheric water vapor

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Examensarbete för masterexamen
Master Thesis
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2011
Författare
Aziz, Muhammad Tariq
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Global Navigation Satellite Systems (GNSS) are used in many applications demanding millimeter level accuracy in positioning. These applications includes land monitoring, crustal movements, detection of large co-seismic displacements. Water vapor is widely recognized to be of fundamental importance in determining climate and its sensitivity. Thesis work primarily focus on the assessment of the signal propagation delay estimates from GNSS by comparison with independent data sets such as measurements from climate models and other GNSS processing. This study compares Satellite measurement with other climate models for the period of 2008 - 2011. This is the first time the second order GNSS stations of SWEPOS had been studied for the Tropospheric delay. For the Nine second-order GNSS station of SWEPOS in Sweden were selected randomly to analyzing water vapor activity. The study is necessary for the Tropospheric region due to all the weather related activity occurs in this region as this region contains more than 90% water vapor. My Master Thesis project focused on evaluating the use of GNSS data from the SWEPOS network to estimate trends in Zenith Tropospheric Delay (ZTD) and their respective ZWD and ZHD, caused by the presence of atmospheric water vapor. The Swedish permanent GNSS network, SWEPOS, today consists of more than 200 stations. The 25 core stations built on solid rock base with a good electromagnetic environment. SWEPOS have been thoroughly evaluated for this purpose for many years but the more recently installed second-order stations, often built on roof-tops, may also be of interest for Atmospheric monitoring as well as Geophysical projects.
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Ämne/nyckelord
Geofysik, Grundläggande vetenskaper, Geovetenskap och miljövetenskap, Meteorologi och atmosfärforskning, Geophysics, Basic Sciences, Earth and Related Environmental Sciences, Meteorology and Atmospheric Sciences
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