基于ERA5资料计算桂林市对流层天顶延迟的精度评估  

Accuracy Evaluation of ZTD Calculated from ERA5 Reanalysis Data in Guilin

作　　者：覃泽颖 周淼 QIN Zeying;ZHOU Miao(Guangxi Guigong Geomatics and Spatial Information Technology Co.,Ltd.,Guilin 541000,China;Guilin Institute of Surveying and Mapping,Guilin 541002,China)

机构地区：[1]广西桂工测绘地理信息科技有限公司,广西桂林541000 [2]桂林市测绘研究院,广西桂林541002

出　　处：《无线电工程》2022年第6期989-995,共7页Radio Engineering

基　　金：国家自然科学基金(41864002)。

摘　　要：对流层延迟是影响全球导航卫星系统(GNSS)高精度定位与导航的主要误差源之一。利用桂林市2017年6—7月的11个GNSS站观测数据解算的对流层天顶延迟(Zenith Tropospheric Delay,ZTD),对欧洲中期天气预报中心(ECMWF)最新一代的ERA5再分析资料在桂林市计算ZTD精度进行了精度评估。结果表明:①各测站日均偏差基本上保持在2 cm左右,日均均方根误差(RMS)保持在2.2 cm左右;②计算的总体平均偏差为1.4 cm,平均RMS为2.18 cm;③桂林南方地区ERA5计算ZTD的平均偏差和RMS普遍要高于北方地区,且在不同测站高程上(100~770 m)ERA5计算的ZTD信息均具有较好的精度。总体来说,ERA5再分析资料在桂林市计算的ZTD精度较高,这些研究结果可为桂林市的对流层改正模型的建立、研究及其所使用的数据源选择方面提供重要的参考依据。Tropospheric delay is one of the main errors affecting GNSS high-precision positioning and navigation.The tropospheric zenith delay(ZTD)calculated from the 11 GNSS stations in Guilin from June to July in 2017 is used to evaluate the accuracy of ZTD calculated from the latest generation ECMWF ERA5 reanalysis data.The results show that the average daily biases of each station are basically maintained at about 2 cm,and the average daily RMS errors are maintained at about 2.2 cm.The overall mean bias is 1.4 cm,and the mean RMS error is 2.18 cm.The average biases and RMS errors of ZTD calculated from ERA5 in southern Guilin are generally higher than those in northern areas,and the ZTD calculated from ERA5 at different station elevations(100~770 m)has good accuracy.In general,the ZTD calculated from ERA5 reanalysis data has a high accuracy in Guilin.These research results can provide an important reference for the establishment and research of tropospheric correction models in Guilin,and the selection of the data sources used.

关 键 词：ERA5 全球导航卫星系统 对流层天顶延迟 精度评估 

分 类 号：P228[天文地球—大地测量学与测量工程]