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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
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 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 6.7 mm 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 5.9 mm and against IGS real-time products with an overall RMS of 8.1 mm. Furthermore, the alternative strategy also provided significant improvements in the 5 cm convergence time in the vertical coordinate component of the float ambiguity solutions to be on average, 51, 36 and 27 minutes for PPP GPS, PPP GLO and PPP GPS+GLO solutions respectively.
Citation: Mohammed, J., Moore, T., Hill, C., and Bingley, R. M.: Alternative Strategy for Estimating Zenith Tropospheric Delay from Precise Point Positioning, Atmos. Meas. Tech. Discuss.,, 2017.
Jareer Mohammed et al.
Jareer Mohammed et al.


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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...