Abstract
This paper presents GPS meteorology using GPS observations obtained from the Korean permanent GPS network during a severe weather condition. Our first experimental studies in Korea were based on data collected from seventeen GPS stations and four radiosonde stations during the period of Typhoon Rusa from 31 August to 1 September 2002. The root mean square difference (RMSD) between the GPS Precipitable Water Vapour (PWV) and the radiosonde-PWV was at the 7.2 mm level. In this new study, a least square analysis was used to reduce the large RMSD and without bias, the RMSD was reduced to 5.7 mm. The mean of the RMSD without consideration of Typhoon Rusa effect was 6.9 mm, whereas the RMSD of GPS-PWV with consideration of the Rusa effect was worse with 9.4 mm. The large RMSD during Typhoon Rusa was due to the change of the observation direction of the balloon based radiosonde by high wind speeds.
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