Universiti Teknologi Malaysia Institutional Repository

Investigation on the impact of tropospheric delay on gps height variation near the equator

Donasabe Dodo, Joseph and Yahya, Mohd. Hafiz and Kamaruddin, Md. Nor Investigation on the impact of tropospheric delay on gps height variation near the equator. In: International Conference on Adaptive Structures and Technologies (ICAST 2007), 10-12 December 2007, Accra, Ghana.

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Abstract

One of the major problems currently facing satellite-based positioning is the atmospheric refraction of the GPS signal caused by the troposphere. The tropospheric effect is much more pronounced at the equatorial region due to its hot and wet conditions. This significantly affects the GPS signal due to the variability of the refractive index, which in turn affects the accuracy of GPS positioning, especially in the height components. This paper presents a study conducted in Malaysia located at the equatorial region, to investigate the impact of tropospheric delay on GPS height variation. Five GPS reference stations forming part of the Malaysian real-time kinematic GPS network (MyRTKnet) in Johor were used. RINEX data from these stations were integrated with GPS and ground meteorological data observed from a GPS station located at the Universiti Teknologi Malaysia (UTM), at varying antenna heights for each session of observation in four campaigns with each campaign lasting for three days. A computer program called TROPO.exe was developed based on Saastamoinen tropospheric model. The result shows variations in the height component of GPS measurement with a maximum value of 119.100 cm and a minimum value of 37.990 cm. Similarly, the results show that, the tropospheric delay is a distance-dependent error, which varies with changes in meteorological condition. Furthermore, result of simulated data shows decrease in tropospheric delay with increase in antenna height.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Ground meteorological data, height component, Saastamoinen model, tropospheric delay.
Subjects:T Technology > T Technology (General)
G Geography. Anthropology. Recreation > GN Anthropology
Divisions:Geoinformation Science And Engineering (Formerly known)
ID Code:7706
Deposited By: En. Tajul Ariffin Musa
Deposited On:14 Jan 2009 04:07
Last Modified:18 Aug 2011 01:44

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