Journal metrics

Journal metrics

  • IF value: 3.248 IF 3.248
  • IF 5-year value: 3.650 IF 5-year 3.650
  • CiteScore value: 3.37 CiteScore 3.37
  • SNIP value: 1.253 SNIP 1.253
  • SJR value: 1.869 SJR 1.869
  • IPP value: 3.29 IPP 3.29
  • h5-index value: 47 h5-index 47
  • Scimago H index value: 60 Scimago H index 60
Discussion papers | Copyright
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Nov 2017

Research article | 10 Nov 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Atmospheric Measurement Techniques (AMT). The revised manuscript was not accepted.

Alternative Strategy for Estimating Zenith Tropospheric Delay from Precise Point Positioning

Jareer Mohammed1,2, Terry Moore1, Chris Hill1, and Richard M. Bingley3 Jareer Mohammed et al.
  • 1Nottingham Geospatial Institute, University of Nottingham, UK
  • 2Civil Engineering Department, College of Engineering, University of Wasit, Iraq
  • 3NERC British Isles continuous GNSS Facility (BIGF), University of Nottingham, UK

Abstract. This study considered zenith total delay (ZTD) estimation from precise point positioning (PPP) based on GPS only (PPP GPS), GLONASS only (PPP GLO), and GPS+GLONASS (PPP GPS+GLO) using both a conventional strategy when applying a model for the hydrostatic component with an estimation of the wet component and an alternative strategy. The proposed alternative strategy is to estimate both the hydrostatic and the wet components of the tropospheric delay using different process noises with different mapping functions for both components in an extended Kalman filter (EKF). It was found that the receiver clock offsets and the estimated ambiguities would absorb some errors in the ZTD when using the conventional strategy. The RMS values of the differences between the double differenced (DD) GPS ZTD and the PPP ZTD, using the alternative strategy, were 6.5, 7.3, and 6.7mm for PPP GPS, PPP GLO, and PPP GPS+GLO, respectively. The results were validated over one continuous week and then over one year. Validation was also performed through comparison with the IGS ZTD values, for 12 weeks, with an overall RMS of 5.9mm and against IGS real-time products with an overall RMS of 8.1mm. Furthermore, the alternative strategy also provided significant improvements in the 5cm convergence time in the vertical coordinate component of the float ambiguity solutions to be on average, 51, 36 and 27minutes for PPP GPS, PPP GLO and PPP GPS+GLO solutions respectively.

Download & links
Jareer Mohammed et al.
Jareer Mohammed et al.
Jareer Mohammed et al.
Total article views: 358 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
274 72 12 358 3 8
  • HTML: 274
  • PDF: 72
  • XML: 12
  • Total: 358
  • BibTeX: 3
  • EndNote: 8
Views and downloads (calculated since 10 Nov 2017)
Cumulative views and downloads (calculated since 10 Nov 2017)
Viewed (geographical distribution)
Total article views: 349 (including HTML, PDF, and XML) Thereof 349 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
No saved metrics found.
No discussed metrics found.
Latest update: 17 Sep 2018
Publications Copernicus
Special issue
Short summary
This paper investigates the conventional strategy (using a model for the hydrostatic component and estimating the wet component) for estimating the (ZTD) from the PPP solutions with an evaluation of the obtained accuracy of the tropospheric ZTD from four tropospheric models. It also presents an alternative strategy (estimating both components using different mapping functions and different process noises) for estimating the ZTD ZTD from the PPP that can give millimeters of ZTD accuracy.
This paper investigates the conventional strategy (using a model for the hydrostatic component...