GPS水汽反演的双向滤波结果分析  

Analysis on the bilateral filtering results of GPS water vapor inversion

作　　者：范士杰[1] 胡卓 彭秀英[1] 宫雅文 崔凯 FAN Shijie;HU Zhuo;PENG Xiuying;GONG Yawen;CUI Kai(School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China;Surveying Mapping and Geoinformation Research Institute,China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国铁路设计集团有限公司测绘地理信息研究院,天津300251

出　　处：《测绘科学》2019年第12期179-183,共5页Science of Surveying and Mapping

基　　金：国家自然科学基金项目（41604027）;山东省自然科学基金项目（ZR2019MD005,ZR2017LD009,ZR2016DQ01）

摘　　要：针对利用精密单点定位(PPP)技术进行GPS水汽反演时,存在相位模糊度的收敛而导致水汽收敛的问题。该文引入PPP双向滤波处理方法,利用香港卫星定位参考站(HKSC)连续30d的GPS观测数据,分别进行PPP单、双向滤波处理。对PPP单向滤波大气可降水量(PWV)的收敛时间及对应的高程误差进行了统计;以ECMWF提供的ERA-Interim再分析资料和附近探空站观测数据为参考,对PPP单、双向滤波处理结果进行了比较和精度分析。结果表明:PPP单向滤波PWV的平均收敛时间约为30min,对应的平均高程误差为11cm;PPP双向滤波可以克服单向滤波初期的水汽收敛问题,且双向滤波PWV结果明显优于单向滤波,相对于ECMWF的平均偏差和均方根误差(RMS)分别减小25%和10%;相对于探空数据的平均偏差和RMS分别降低15%和7%。When using precise point positioning(PPP)to perform GPS water vapor inversion,there is a water vapor convergence process caused by the convergence of phase ambiguity.The bilateral filtering approach of PPP is introduced to resolve the water vapor convergence problem.The one-way and bilateral filtering of PPP were carried out respectively by using 30days of continuous GPS observations from HKSC site in Hong Kong satellite positioning reference station network.The convergence time of the precipitable water vapor(PWV)and corresponding GPS elevation error were counted.The results from one-way and bilateral filtering of PPP were compared,using the ERA-Interim reanalysis data from ECMWF and the radiosonde data as references.The results shows the average PWV convergence time from one-way filtering of PPP is about 30minutes,and the corresponding average elevation error is 11cm.The bilateral filtering method of PPP can overcome the problem of the water vapor convergence at the initial stage of one-way filtering,and the bilateral filtering PWV is obviously better than the one-way filtering result.The average deviation and root mean square(RMS)error from the bilateral filtering relative to ECMWF are reduced by 25%and 10%,respectively.Relative to the radiosonde data,the deviation and RMS error from the bilateral filtering are reduced by 15%and 7%.

关 键 词：大气可降水量 精密单点定位 双向滤波 收敛时间 

分 类 号：P228[天文地球—大地测量学与测量工程]