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The effect of modified UNBABC mapping function on the improvement of global positioning system tropospheric delay

Hamzah Sakidin, and Tay, Choo Chuan, and Saedah Sakidin, (2010) The effect of modified UNBABC mapping function on the improvement of global positioning system tropospheric delay. Journal of Engineering and Technology, 1 (1). pp. 127-136. ISSN 2180-3811

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Affiliations

Universiti Teknikal Malaysia Melaka. Faculty of Electrical Engineering
Universiti Teknikal Malaysia Melaka. Faculty of Electrical Engineering
Malaysian Maritime Academy

Abstract

Global Positioning System (GPS) tropospheric delay refers to the refraction of the GPS signal as it passes through the neutral atmosphere from the satellite to the earth, which causes longer distance traveled by the signal. The issue of atmospheric delay is investigated to minimize the positioning error due to tropospheric and ionospheric delay. The mathematical modeling on the tropospheric model should be revised and also modified to improve the delay. The zenith tropospheric delay can be amplified by a coefficient factor called mapping function to form total tropospheric delay. There are many mapping functions have been established to calculate the scale factor which can affect the total tropospheric delay. However, the mapping functions give large value when the elevation angles less than 5 degrees. The modification of the continued fractions by replacing sine function to cosine function in the popular mapping function called UNBabc has been proposed and tested to ensure the improvement of the result. The result of the modification, show a significant reduction of mapping function scale factor. The modified UNBabc mapping function has improved the tropospheric delay up to 19.1% at 2 degree elevation angle. This modified mapping function could be used as the alternative mapping function.

Item Type:Journal
Keywords:Global Positioning System, modeling, tropospheric, modification, zenith, delay.
Subjects:T Technology, Engineering
ID Code:11344

J. Guo, R.B.Langley. 2003 A New Tropospheric Propagation Delay Mapping Function For Elevation Angles Down To 2 .Proceeding of ION GPS/GNSS 2003. 16th International Technical Meeting of the Satellite Division of The Institute of Navigation. Portland. pp 386 – 396.

J. Saastamoinen. 1972. Atmospheric correction for troposphere and stratosphere in radio ranging if satellites. Geophysical monograph 15. American Geophysical Union. Washington D. C USA. pp. 247-252.

T. Schuler. 2001. On Ground-Based GPS Tropospheric Delay Estimation. PhD Thesis. University of Munchen. pp.364.

Y.W. Ahn. 2005. Analysis of NGS CORS Network for GPS RTK Performance Using External NOAA Tropospheric Corrections Integrated with a Multiple Reference Station Approach. M.Sc. Theses. University of Calgary Alberta Canada. pp.185.

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