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《Journal of Applied Meteorological Science》 2015-03
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The Accuracy Test of Retrieved Precipitation Water Vapor Based on Beidou Observations

Guo Wei;Yin Qiu;Du Mingbin;Liu Min;Zhu Xuesong;Shanghai Center for Satellite Remote Sensing Applications;  
The Beidou Navigation Satellite System is an independent system under construction in China.Observations of Beidou can be used to retrieve atmospheric precipitation water vapor(PWV) and provide information of water vapor with high precise and high real time.Beidou meteorological observation network is built by Shanghai Meteorological Bureau with PANDA(position and navigation data analysist) and M300C_GNSS,UNICORE-UB240 Beidou receivers,and the atmospheric precipitation water vapor is acquired.First,satellite data is received by Beidou meteorological observations and satellite orbit files are downloaded synchronously,and then zenith total delay(ZTD) is calculated by PANDA modules,and at last the PWV is retrieved based on surface meteorological parameters observed by automatic weather stations.Results of PWV retrieved by Beidou data(W_(BD)) are compared with both PWV retrieved by GPS data(W_(GPS)) and radiosonde data(W-(Radio),as the technology of them are mature.W_(GPS) is retrieved by two methods:One is GAMIT(GPS at MIT) with the method of double difference phase observation,the other is PANDA with the method of precise point positioning.W_(Radio) is retrieved by the method of water vapor integration from different pressure levels.The horizontal distance difference between corresponding observations is no more than 10 km,the elevation difference between GPS and Beidou observations is no more than5 m,and the elevation difference between radiosonde and Beidou observations is about 30 m.Results show that the root mean square error(RMSE) between W_(BD) and W_(GPS) is no more than 3.5 mm,the correlation coefficient between them is over 0.95,and the RMSE between W_(BD) and W_(GPS-P) is smaller than that between W_(bd) and W_(GPS-G),which means that the retrieve method has certain influence on results of PWV.The RMSE between W_(BD) and W_(GPS-Radio) is about 3.6 mm,the correlation coefficient between them is over 0.96,and W_(BD) is on the high side compared with W_(GPS-Radio).W_(BD) can well reflect the temporal changing characteristics of water vapor in the atmosphere and has corresponding relations with precipitation,which plays an important role in short-term weather forecast and climate analysis.The accuracy of W_(BD) relies much on the precise ephemeris of Beidou.With the development of the Beidou Navigation Satellite System,the accuracy of PWV based on Beidou observations can surpass that based on GPS observations.Therefore,making the best of the Beidou Navigation Statellite System and improving meteorological service with W_(BD) is important for the modernization of meteorology.
【Fund】: 上海市气象局启明星课题“地基北斗资料的质量检验和初步应用” 国家自然科学基金面上项目(41475040);; 中国气象局气象行业专项(201306102);; 上海市气象局科技面上项目(ms201414)
【CateGory Index】: P412.27
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