摘要
针对南极洲地区水汽资料匮乏且时空分辨率低的问题,提出顾及高程的南极洲GNSS可降水量K值模型:基于全球卫星导航系统(GNSS)获取的大气可降水量(PWV),利用2015—2021年南极洲地区的8个探空站资料,通过数值积分法计算水汽转换系数(K值),用2015—2017年的K值建立Emardson-I模型与顾及高程的Emardson-H模型;并用2018—2021年5个探空站和4个GNSS站检验2种模型的预测精度。结果表明:就K值预报精度而言,Emardson-I模型的平均绝对偏差(MAE)和均方根(RMS)的平均值分别为0.00199和0.00247,Emardson-H模型的平均MAE和平均RMS分别为0.00179和0.00228,Emardson-H模型精度略优于Emardson-I模型;在南极洲的低海拔地区,基于Emardson-I和Emardson-H模型的GNSS-PWV精度一致,顾及高程的Emardson-H模型优势并不明显;与探空资料的PWV相比,Emardson-H模型的PWV反演精度优于Emardson-I模型。顾及高程的Emardson-H模型预测精度较高,更适用于南极洲地区的GNSS-PWV反演。
Aiming at the problem of the lack of water vapor data and low spatial and temporal resolution in Antarctica,the paper proposed the K value models of global navigation satellite system(GNSS)precipitable water vapor(PWV)considering elevations in Antarctica:based on the PWV obtained by GNSS,the water vapor conversion coefficient(K value)was calculated by numerical integration method with the data of 8 sounding stations in Antarctica from 2015 to 2021,and the Emardson-I model and the Emardson-H model considering elevation were established by using the K value from 2015 to 2017;then,five sounding stations and four GNSS stations from 2018 to 2021 were used to test the prediction accuracy of the two models.Results showed that in terms of the prediction accuracy of K value,the average mean absolute error(MAE)and average root mean square(RMS)of Emardson-I model would be 0.00199 and 0.00247,respectively,and the average mean MAE and average RMS of Emardson-H model would be 0.00179 and 0.00228,respectively,indicating that the accuracy of Emardson-H model could be better than that of Emardson-I model;moreover,in the low altitude area of Antarctica,the accuracy of GNSS-PWV based on Emardson-I and Emarsson-H models would be basically the same,and the advantage of Emarsdon-H model considering elevation would be not obvious;compared with the PWV of radiosonde data,the PWV retrieval accuracy of Emardson-H model could be better than that of Emardson-I model;in general,the Emardson-H model considering elevation could have higher prediction accuracy and be more suitable for GNSS-PWV inversion in Antarctica.
作者
王锦
李黎
张敏
许思怡
卢厚贤
何琦敏
WANG Jin;LI Li;ZHANG Min;XU Siyi;LU Houxian;HE Qimin(School of Geographic Science and Mapping Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009,China;Research Center of BeiDou Navigation and Environmental Remote Sensing,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009,China)
出处
《导航定位学报》
CSCD
北大核心
2024年第2期102-111,共10页
Journal of Navigation and Positioning
基金
国家自然科学基金项目(42204014)
江苏省高等学校大学生创新创业训练计划重点项目(202410332122Y,202310332118Y,202210332022Z)
江苏省研究生实践创新计划项目(SJCX24_1901)。
作者简介
第一作者:王锦(2001-),女,河南郑州人,研究方向为GNSS气象学。;通信作者:李黎(1981-),男,甘肃庄浪人,博士,副教授,研究方向为GNSS精密定位及GNSS气象学。
