Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..161g&link_type=abstract
13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 161 - 165
Astronomy and Astrophysics
Astronomy
Scientific paper
Very Long Baseline Interferometry (VLBI) is colocated with a permanent Global Positioning System (GPS) receiver and a Water Vapour Radiometer (WVR) at the Onsala Space Observatory (OSO). Both VLBI and GPS data are affected by the propagation delay of radio waves in the atmosphere, while the WVR is sensitive to the atmospheric emission close to the center of the 22 GHz water vapour emission line and provides wet delay estimates. The authors present a comparison of estimated atmospheric parameters (equivalent zenith wetdelay and linear horizontal delay gradients) derived from an independent analysis of simultaneous VLBI, GPS and WVR observations. They study and compare the estimated parameters using different elevation cut off angles for the analysis of VLBI data with those obtained from the GPS and the WVR data analyses. The parameters are estimated for 90, 180 and 360 minutes long intervals, which allows to study the averaging effect on the integrated parameters of the turbulent atmosphere.
Elgered Gunnar
Gradinarsky Lubomir P.
Haas Ruth
Johansson Jan M.
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