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Estimation of tropospheric zenith delay and gradients over the Madrid area using GPS and WVR data
Author(s) -
Ruffini G.,
Kruse L. P.,
Rius A.,
Bürki B.,
Cucurull L.,
Flores A.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900238
Subject(s) - zenith , environmental science , global positioning system , troposphere , radiometer , numerical weather prediction , remote sensing , meteorology , geodesy , kalman filter , geology , geography , mathematics , computer science , statistics , telecommunications
We have analyzed data from an experiment over the Madrid (Spain) area obtained from 5 GPS receivers and 3 Water Vapor Radiometers (WVR), in order to compare their retrievals of Tropospheric Slant Delays. For this purpose we have fitted a simple gradient model to both types of data, using a Kalman filter to account for the temporal variability of the zenith and gradient parameters. We show that the retrieved gradients with the two instruments are compatible, thus suggesting that the derived slant delays can be useful for tomographic analysis. We compare the estimates of ZWD obtained with the GIPSY and the Bernese software packages. Finally, we compare the estimated gradients with those obtained with HIRLAM, a Numerical Weather Prediction model.