Improvement in PWV estimation from GPS due to the absolute calibration of antenna phase center variations |
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| Authors: | J P Ortiz de Galisteo C Toledano V Cachorro B Torres |
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| Institution: | (1) Group of Atmospheric Optics, University of Valladolid, Valladolid, Spain;(2) Meteorological State Agency (AEMET), Valladolid, Spain |
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| Abstract: | Climatology of column-integrated atmospheric water vapor over Spain has been carried out by means of three techniques: soundings,
sun photometers and GPS receivers. Comparing data from stations equipped with more than one of these instruments, we found
that a large discontinuity occurred on November 6, 2006, in the differences between the data series from GPS receivers and
those from the other two techniques. Prior to that date, the GPS data indicate a wet bias of 2–3 mm for all stations when
compared with sounding or photometer data, whereas after that date this bias practically reduces to zero. The root mean square
error also decreases about half of its value. On November 6, 2006, the International GNSS Service adopted an absolute calibration
model for the antennas of the GPS satellites and receivers instead of the relative one. This change is expected to be an improvement,
increasing the accuracy of station position determination and consequently benefiting post-processing products such as zenith
total delay from which the atmospheric water vapor content is calculated. |
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