An investigation into the correlations among GNSS observations and their impact on height and zenith wet delay estimation for medium and long baselines

作     者：Johnny LO Ahmed EL-MOWAFY 

作者机构：Mathematics Discipline GroupSchool of EngineeringEdith Cowan University270 Joondalup DriveWestern Australia 6027Australia Faculty of Science and EngineeringDepartment of Spatial SciencesCurtin University of TechnologyKent StreetWestern Australia 6102Australia 

出 版 物：《Geo-Spatial Information Science》 (地球空间信息科学学报（英文）)

年 卷 期：2012年第15卷第4期

页      面：219-228页

核心收录：

学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 

基　　金：This work was completed under a scholarship from Curtin University of Technology Perth Australia and through Australian Research Council APAI grant LP0347723 in collaboration with the Australian Bureau of Meteorology 

主　　题：stochastic models MINQUE ZWD heights 

摘      要：Most stochastic modelling techniques neglect the correlations among the raw un-differenced observations when forming the variance-covariance matrix of the Global Navigation Satellite System(GNSS)*** methods were developed to model these *** such method is the Minimum Norm Quadratic Unbiased Estimator(MINQUE).Studies have shown that MINQUE improves ambiguity resolution,and ultimately,the positioning solution in short ***,its effect in cases of processing with longer baselines and on the estimation of zenith wet delay(ZWD)is somewhat *** this paper,a comparison between the impact of neglecting the correlations among the observations using an elevation-angle-dependent model(EADM)and modelling the correlations using MINQUE on height determination and ZWD for medium and long baselines is carried *** initial testing was carried out across two Australian GNSS stations with a medium-length baseline throughout a three-week *** results showed that using MINQUE did not resolve the coordinate,height and wet delay components as accurately as the *** results were further verified with two long-baseline campaigns whereby EADM was also able to provide better wet delay *** coordinate results were,however,***,the study concluded that the inclusion of the correlations among the observations,in general,do not improve the resolution of the coordinate and wet delay estimates.