The effect of UNBabc mapping function modification to gps tropospheric delay

Sakidin, Hamzah and Abu Bakar, Mohd Rizam and Mohamed Shariff, Abd Rashid and Md Nooraini, Mohd Salmi and Matori, Abd. Nasir and Mohamed, Azhari and Ahamd, Asmala (2008) The effect of UNBabc mapping function modification to gps tropospheric delay. Malaysian Journal of Mathematical Sciences, 2 (1). pp. 59-71. ISSN 1823-8343

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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:Article
Keyword:Mapping function; Modification; Tropospheric; Zenith.
Subject:Global Positioning System.
Faculty or Institute:Faculty of Science
Publisher:UPM Press
ID Code:17118
Deposited By: Najwani Amir Sariffudin
Deposited On:27 Jun 2012 01:58
Last Modified:27 Jun 2012 01:58

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