Estimation of Precipitable Water Vapor Using the GPS

Details Estimation of Precipitable Water Vapor Using the GPS Estimation of Precipitable Water Vapor Using the GPS

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jass...16...61m&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 16, no. 1, p. 61-68.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The radio waves transmitted from GPS satellites is delayed by the troposphere as they propagate to Earth-based GPS receivers. The troposphere delay is usually divided into two parts, the dry delay due to the atmospheric gases and the wet delay due to the water vapor. In this study for the month of May in 1998 the GPS data from two stations(Taejon, Suwon) were used to estimate the total troposphere delay in the zenith direction by the least square method. The dry delay in the zenith direction can be evaluated by using surface pressure values at the station, then the zenith wet delay is obtained by removing the zenith dry delay from the total delay. The zenith wet delay is strongly correlated with the total precipitable water. The quality of the estimate has been assessed by comparison with radiosonde data at Osan. We found the good agreement in precipitable water of the GPS estimates and the radiosonde data. The standard deviation of the difference between the GPS and radiosonde observations was 3.68mm at Suwon.

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