Abstract
In this paper, a constant conversion factor PI is proposed for retrieval of Precipitable Water Vapor (PWV) from Global Positioning System (GPS) signal delay in Tropical region. The factor PI is calculated using water-vapor weighted mean temperature (Tm). For Tropical region, Tm doesn't vary much and thus range of PI values is also small. Therefore, using the data obtained from 5 different sites of Tropical region, a constant PI value of 0.163 is proposed for calculation of PWV from GPS signals in Tropical region. The proposed conversion factor allows for the ease of PWV retrieval, which is useful in meteorological studies and also applicable in satellite communications.
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