Improving atmospheric pressure vertical correction model using Gaussian function  

作　　者：Baoshuang Zhang Junyu Li Lilong Liu Yibin Yao Liangke Huang Chao Ren Hongchang He Tengxu Zhang Yuxin Wang 

机构地区：[1]College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China [2]Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin 541004,China [3]School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China [4]Schoolof Resources and Environmental Science and Engineering,Hubei University of Science and Technology,Xianning 437100,China

出　　处：《Geodesy and Geodynamics》2025年第1期67-74,共8页大地测量与地球动力学(英文版)

基　　金：supported by the National Natural Science Foundation of China(42304018);the National Natural Science Foundation of China(42330105,42064002,42074035);the Guangxi Natural Science Foundation of China(Guike AD23026177,2020GXNSFBA297145);the Foundation of Guilin University of Technology(GUTQDJJ6616032);Guangxi Key Laboratory of Spatial Information and Geomatics(21238-21-05);the Innovation Project of Guangxi Graduate Education(YCSW2023341)。

摘　　要：The Zenith Hydrostatic Delay(ZHD)is essential for high-precision Global Navigation Satellite System(GNSS)and Very Long Baseline Interferometry(VLBI)data processing.Accurate estimation of ZHD relies on in situ atmospheric pressure,which is primarily variable in the vertical direction.Current atmospheric pressure is either site-specific or has limited spatial coverage,necessitating vertical corrections for broader applicability.This study introduces a model that uses a Gaussian function for the vertical correction of atmospheric pressure when in situ meteorological observations are unavailable.Validation with the fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis(ERA5)reveals an average Bias and RMS for the new model of 0.31 h Pa and 2.96 h Pa,respectively.This corresponds to improvements of 37.5%and 80.3%in terms of RMS compared to two commonly used models(T0and Tvmodels)that require in situ meteorological observations,respectively.Additional validation with radiosonde data shows an average Bias and RMS of 1.85 h Pa and 4.87 h Pa,corresponding to the improvement of 42.8%and 71.1%in RMS compared with T0and Tv models,respectively.These accuracies are sufficient for calculating ZHD to an accuracy of 1 mm by performing atmospheric pressure vertical correction.The new model can correct atmospheric pressure from meteorological stations or numerical weather forecasts to different heights of the troposphere.

关 键 词：ATMOSPHERIC pressure Vertical correction Zenith hydrostatic delay(ZHD) Gauss function ERA5 

分 类 号：P228.4[天文地球—大地测量学与测量工程]