GPS Solutions

, Volume 15, Issue 1, pp 39–48

Assessment of ECMWF-derived tropospheric delay models within the EUREF Permanent Network

Original article

Abstract

The Global Positioning System (GPS) observations from the EUREF Permanent Network (EPN) are routinely analyzed by the EPN analysis centers using a tropospheric delay modeling based on standard pressure values, the Niell Mapping Functions (NMF), a cutoff angle of 3° and down-weighting of low elevation observations. We investigate the impact on EPN station heights and Zenith Total Delay (ZTD) estimates when changing to improved models recommended in the updated 2003 International Earth Rotation and Reference Systems Service (IERS) Conventions, which are the Vienna Mapping Functions 1 (VMF1) and zenith hydrostatic delays derived from numerical weather models, or the empirical Global Mapping Functions (GMF) and the empirical Global Pressure and Temperature (GPT) model. A 1-year Global Positioning System (GPS) data set of 50 regionally distributed EPN/IGS (International GNSS Service) stations is processed. The GPS analysis with cutoff elevation angles of 3, 5, and 10° revealed that changing to the new recommended models introduces biases in station heights in the northern part of Europe by 2–3 mm if the cutoff is lower than 5°. However, since large weather changes at synoptic time scales are not accounted for in the empirical models, repeatability of height and ZTD time series are improved with the use of a priori Zenith Hydrostatic Delays (ZHDs) derived from numerical weather models and VMF1. With a cutoff angle of 3°, the repeatability of station heights in the northern part of Europe is improved by 3–4 mm.

Keywords

GPS EUREF Permanent Network Troposphere Mapping function Cutoff angle 

List of Abbreviations

DORIS

Doppler Orbit determination and Radiopositioning Integrated on Satellite

EPN

EUREF Permanent Network

GMF

Global Mapping Functions

GNSS

Global Navigation Satellite System

GPS

Global Positioning System

GPT

Global Pressure and Temperature

IERS

International Earth rotation and Reference systems Service

IGS

International GNSS Service

ITRF

International Terrestrial Reference Frame

NMF

Niell Mapping Functions

SPT

Standard Pressure and Temperature

STD

Slant Total Delay

VLBI

Very Long Base Interferometry

VMF1

Vienna Mapping Functions 1

VZHD

Vienna Zenith Hydrostatic Delay

ZHD

Zenith Hydrostatic Delay

ZTD

Zenith Total Delay

ZWD

Zenith Wet Delay

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Laboratoire de Géomatique et de Géodésie (L2G)ESGT/CNAMLe MansFrance
  2. 2.Université de Nantes, Nantes Atlantique Université, CNRS, Laboratoire de Planétologie et Géodynamique, UMR 6112, UFR des Sciences et des TechniquesNantes Cedex 3France
  3. 3.Vienna University of TechnologyViennaAustria

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