FIG Peer Review Journal


Analysis of the Spatio-Temporal Variability and Impact of Tropospheric Delay on the Positional Accuracy in GNSS PPP Observations (7566)

Joseph Odumosu, Oluibukun Ajayi, Yusuf Opaluwa, Abdullahi Kuta, A Taiwo and Ifeanyi C. Onuigbo (Nigeria)
Mr Joseph Odumosu
Assistant Lecturer
Federal University of Technology, Minna
PMB 1060
Department of Survey and Geoinformatics
Federal University of Technology, Minna
Corresponding author Mr Joseph Odumosu (email: odumossu4life[at], tel.: +23480 2262 4535)

[ abstract ] [ paper ] [ handouts ]

Published on the web 2015-03-31
Received 2014-11-01 / Accepted 2015-02-07
This paper is one of selection of papers published for the FIG Working Week 2015 in Sofia, Bulgaria and has undergone the FIG Peer Review Process.

FIG Working Week 2015
ISBN 978-87-92853-35-6 ISSN 2307-4086


Improvements in dual frequency observations with multiple differencing techniques have led to the development of the Precise Point Positioning (PPP) observation technique. Envisaged to have reduced positioning error; the tropospheric delay and multipath error remain the most outstanding factors that mitigating its positional accuracy in PPP observations. This paper attempts to access the impact and spatio-temporal variability of tropospheric delay on PPP positioning technique in GNSS observations across Nigeria. 24 hours data from six CORS across the six geopolitical zones in the country have been processed at three months interval (January – July, 2014) using the RTKLIB software in the PPP static post processing mode. Results obtained indicate a leap frog pattern of variation in the tropospheric delay across the country with least delay observed in January (during the dry season).
Keywords: n/a