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The effect of UNBabc mapping function modification to GPS tropospheric delay

Abd.N., Matori and H., Sakidin and M.R., Abu Bakar and A.R.M., Shariff and M.S.Md., Noorani and A., Mohamed and A., Ahmad (2008) The effect of UNBabc mapping function modification to GPS tropospheric delay. [Citation Index Journal]

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Abstract

Tropospheric delay refers to the refraction of the Global Positioning System (GPS) signal as it passes through the neutral atmosphere from the satellite to the earth, which causes longer distance traveled by the signal. The zenith tropospheric delay can be amplified by mapping function, especially for less than 5 degrees elevation angle. Many mapping functions have been established however the mapping functions give large value when the elevation angles less than 5 degrees. A modification of UNBabc mapping function has been proposed. The modified UNBabc mapping function model shows a significant reduction of mapping function scale factor. As the coefficient of the zenith tropospheric delay, the value of mapping function will affect total tropospheric delay. The modification UNBabc mapping function has improved the tropospheric delay up to 19.1 percent at two degree elevation angles.

Item Type:Citation Index Journal
Uncontrolled Keywords:Mapping function; Modification; Tropospheric; Zenith
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Departments / MOR / COE:Departments > Civil Engineering
ID Code:33
Deposited By: Assoc Prof Dr Abd Nassir Matori
Deposited On:17 Feb 2010 08:39
Last Modified:19 Jan 2017 08:26

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