Prelimilary Research On Near-Real Time GPS Water Vapor Auto Processing System

Water vapor is the very important message for us to understand atmospheric changes, so many meteorologists put water vapor and its variation as an important subject. However the scarcity of traditional atmospheric soundings greatly restricts the application of water vapor data in meteorology. With the great development of GPS technology in the recent years, the research on water vapor using GPS attracts more meteorologists. With its high precision, all weather, high temporal resolution, high reliability and no calibration, GPS became a complementary to the regular atmospheric soundings gradually.This paper mainly introduce the construction of near-real time GPS water vapor auto processing system and the process which retrieve the atmospheric Precipitable Water Vapor. The system which basis on high precision process soft can collect weather and observation data, auto download Ephemeris data, auto process, store, display and warning. According to the problem how to realize the system, this paper make the following research. Firstly, this paper discuss some problem how to retrieve the atmospheric Precipitable Water Vapor of each station in Beijing regional GPS network, and bring forward the auto process scheme. Secondly , the system adopt modern technology for example communicate, postprocessing with high precision , web display to resolve the problem at station on how to organize collecting data, display result and come true with near-real time. Finally, the system analyse the atmospheric Precipitable Water Vapor at Shijingshan and Daxing in July 10, 2004. It suggests that the Water Vapor produced by this auto processing system can provide scientific reference for rainstorm monitoring and forecast.With the establishment of the Beijing GPS network and the retrieves advancement of GPS/MET technology, we set up an auto processing system to download the GPS data and retrieve the Precipitable Water Vapor, which will be the great potential in weather forecast and application in numeric weather model. Above all, the realization of the near-real time auto processing system can accelerate thedevelopment of GPS/MET business.