利用北斗CORS反演大气可降水量的精度分析  

Accuracy analysis of precipitable water vapor retrieved by Beidou CORS

作　　者：赵琨 罗力 杨凤芸[1] ZHAO Kun;LUO Li;YANG Fengyun(School of Civil Engineering,Liaoning University of Science and Technology,Anshan,Liaoning 111051,China;Liaoning Geospatial Achievements Application Center,Shenyang 110031,China)

机构地区：[1]辽宁科技大学土木工程学院,辽宁鞍山114051 [2]辽宁省地理空间成果应用中心,沈阳110034

出　　处：《测绘科学》2021年第11期12-17,共6页Science of Surveying and Mapping

摘　　要：为探究BDS反演大气可降水量(PWV)的精度,该文采用辽宁省连续运行参考站的BDS/GPS观测数据,选择辽宁省中部地区4个代表站,通过GAMIT软件进行单系统解算,并以ECMWF再分析资料为参考的真值进行了分析比对。研究表明,BDS解算的PWV平均误差、均方根误差在4 mm以内,比GPS反演结果精度稍低;而PWV因其与实际降水有较好的相关性,可作为短期临近天气预报的参考:当PWV开始累积超过6 h时,降水的可能性较大,大规模的降雨一般伴随着迅速的水汽聚集与释放。In order to explore the accuracy of BDS in retrieving the precipitable water vapor(PWV),the continuously operating reference station of Liaoning province was used based on the BDS/GPS observation data of stations,four representative stations in central Liaoning province were selected for single system calculation by GAMIT software,and the true values of ECMWF reanalysis data were analyzed and compared.The results show that the average error and root mean square error of PWV calculated by BDS are within 4 mm,which is slightly lower than that of GPS inversion;PWV can be used as a reference for short-term near weather forecast because of its good correlation with the actual precipitation:when PWV begins to accumulate for more than 6 hours,the possibility of precipitation is greater.Large scale rainfall is usually accompanied by rapid water vapor accumulation and release.

关 键 词：北斗卫星导航系统 降雨预测 大气可降水量(PWV) 精度分析 ECMWF 

分 类 号：P228[天文地球—大地测量学与测量工程]