INVESTIGATION OF SMALL SCALE WATER VAPOR DISTURBANCE BY USING POWER SPECTRUM OF GPS ATMOSPHERIC DELAY

Abstract

Water vapor variation has been investigated by using GPS. However, short-term disturbance of water vapor has not been sufficiently understood. Therefore, a method for investigating the short-term disturbance of water vapor is proposed in this study. In this method, power spectrum of atmospheric delay, which is obtained by GPS, is modeled. The parameter of the model and root mean square error (RMS) is used for investigation. The method is applied to the data obtained in Biwako Project '98 held in July 1998. As a result of the research, the difference between power spectra of observed data and power spectrum model shows the mechanismof water vapor disturbance.