An observational study on the real-time precipitable water vapor with a dense GNSS receiver network

摘要

We aim to observe the behavior of water vapor during a rainfall. We employ the GNSS meteorology to estimate a vertically integrated water vapor, so called PWV (Precipitable Water Vapor), from the propagation delay of GNSS signal. We established a dense GNSS receiver network in Uji using 15 receivers with 1-2 km spacing. We found difference of PWV in 10 km was 3-10 mm during a heavy rain. For a future GNSS network in a much wide area, we use inexpensive single-frequency (SF) receivers. Because SF receiver cannot eliminate the ionospheric delay, we interpolate the delay referring to the results from nearby dual frequency (DF) receivers.