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Precision Validation of GPS Precipitable Water Vapor via Comparison with MWR Measurements  

Ha, Jihyun (Department of Geoinformatic Engineering, Inha University)
Park, Kwan-Dong (Department of Geoinformatic Engineering, Inha University)
Chang, Ki-Ho (Global Environment System Research Laboratory, National Institute of Meteorological Research, KMA)
Yang, Ha-Young (Global Environment System Research Laboratory, National Institute of Meteorological Research, KMA)
Publication Information
Atmosphere / v.17, no.3, 2007 , pp. 291-298 More about this Journal
Abstract
The precipitable water vapors (PWVs) obtained from Global Positioning System (GPS) and Microwave Radiometer (MWR) measurements have been compared for validation of precision of the GPS PWV at Daegwallyoung station for 21 days from Sep. 30 to Oct. 20, 2006. The GPS PWV is estimated using the delay of GPS signals due to the water vapor in the atmosphere with a local mean temperature equation, called HP model, and the MWR PWV by the combinational radiance observation of two channels (23.8 and 31.4 GHz). During the co-observation period, the MWR and GPS PWV show a similar trend, and the bias between the PWVs is 1.7 mm on average. When the bias is removed, the PWV of GPS gives good agreement with that of MWR, having about 1 mm for both the standard deviation and RMS error between the GPS and MWR PWV.
Keywords
Precipitable Water Vapor; GPS; Microwave Radiometer; Mean Temperature Equation;
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