基于探空资料的华北平原地区Tm模型精化  

Refinement of Tm model of North China plain using radio sounding data

作　　者：张晓梅 廖发圣 刘立龙 ZHANG Xiaomei;LIAO Fasheng;LIU Lilong(Hezhou Natural Resources Surveying and Mapping Geographic Information Planning Institute,Hezhou,Guangxi 542800,China;Heze Earthquake Monitoring Center Station,Heze,Shandong 274000,China;College of Geomatics and Geoinformation,Guilin University of Technology,Guilin,Guangxi 541006,China)

机构地区：[1]贺州市自然资源测绘地理信息规划院,广西贺州542800 [2]菏泽地震监测中心站,山东菏泽274000 [3]桂林理工大学测绘地理信息学院,广西桂林541006

出　　处：《导航定位学报》2023年第5期143-150,共8页Journal of Navigation and Positioning

摘　　要：为了进一步提高全球卫星导航系统(GNSS)反演大气可降水量(PWV)的精度,提出一种基于探空资料的华北平原地区大气加权平均温度(Tm)模型精化方法:利用中国华北平原地区8个无线电探空站2015—2017年的探空资料,通过快速傅立叶变换分析Tm的周期性变化以及与诸多因子的相关性;然后基于最小二乘线性回归分析方法分别建立Tm与地表温度(Ts)的线性模型(T_(m1)模型)以及顾及周期性的多因子Tm区域化回归模型(T_(m2)模型);最后以2018年的探空数据为参考值,与Bevis公式对比进行精度验证。结果表明,相对于Bevis公式,T_(m1)模型和T_(m2)模型的均方根误差(RMS)分别为3.61和3.47 K,精度分别提升9.4%和12.7%;说明提出的Tm模型在中国华北平原地区具有更高的精度,可为该地区的GNSS水汽探测提供参考。In order to further improve the accuracy of global navigation satellite system(GNSS)inverting precipitable water vapor(PWV),the paper proposed a refinement method of weighted mean atmospheric temperature(Tm)model of North China plain using radio sounding data:based on the sounding data of eight radio sounding stations in North China plain from 2015 to 2017,the periodic change of Tm and its correlation with many factors were analyzed by fast Fourier transform;and then the linear model of Tm and surface temperature(Ts)(T_(m1) model)and the multi-factor Tm regional regression model considering periodicity(T_(m2)model)were established based on the least square linear regression analysis method;finally,using sounding profiles in 2018 as reference values,the accuracy was verified by comparing with Bevis formula.Result showed that compared with the Bevis formula,the RMS of T_(m1) model and T_(m2)model would be 3.61 and 3.47 K respectively,and the accuracy would be improved by 9.4%and 12.7%,respectively,which indicates that the proposed Tm model could have higher accuracy in the North China plain region,to provide a reference for related study on GNSS water vapor detection.

关 键 词：大气加权平均温度(Tm) 华北平原 Tm模型 全球卫星导航系统(GNSS) 大气可降水量(PWV) 

分 类 号：P228[天文地球—大地测量学与测量工程]