Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
권호 표지

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

MWR 관측치와 비교를 통한 GPS 가강수량 정밀도 검증

  • 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)
  • 하지현 (인하대학교 사회기반시스템공학부 지리정보공학과) ;
  • 박관동 (인하대학교 사회기반시스템공학부 지리정보공학과) ;
  • 장기호 (기상연구소 지구환경시스템연구실) ;
  • 양하영 (기상연구소 지구환경시스템연구실)
  • Received : 2007.07.23
  • Accepted : 2007.09.12
  • Published : 2007.09.30
Download PDF
⟨ Previous Next ⟩

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