The effect of UNBabc mapping function modification to GPS tropospheric delay

Hamzah Sakidin, Mohd Rizam Abu Bakar, Abdul Rashid Mohamed Shariff, Mohd. Salmi Md. Noorani, Abd Nasir Matori, Azhari Mohamed, Asmala Ahmad

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)59-71
Number of pages13
JournalMalaysian Journal of Mathematical Sciences
Volume2
Issue number1
Publication statusPublished - 2008

Fingerprint

Global Positioning System
Degree Elevation
Angle
Scale factor
Refraction
Percent
Atmosphere
Coefficient

Keywords

  • Mapping function
  • Modification
  • Tropospheric
  • Zenith

ASJC Scopus subject areas

  • Mathematics(all)

Cite this

Sakidin, H., Abu Bakar, M. R., Shariff, A. R. M., Md. Noorani, M. S., Matori, A. N., Mohamed, A., & Ahmad, A. (2008). The effect of UNBabc mapping function modification to GPS tropospheric delay. Malaysian Journal of Mathematical Sciences, 2(1), 59-71.

The effect of UNBabc mapping function modification to GPS tropospheric delay. / Sakidin, Hamzah; Abu Bakar, Mohd Rizam; Shariff, Abdul Rashid Mohamed; Md. Noorani, Mohd. Salmi; Matori, Abd Nasir; Mohamed, Azhari; Ahmad, Asmala.

In: Malaysian Journal of Mathematical Sciences, Vol. 2, No. 1, 2008, p. 59-71.

Research output: Contribution to journalArticle

Sakidin, H, Abu Bakar, MR, Shariff, ARM, Md. Noorani, MS, Matori, AN, Mohamed, A & Ahmad, A 2008, 'The effect of UNBabc mapping function modification to GPS tropospheric delay', Malaysian Journal of Mathematical Sciences, vol. 2, no. 1, pp. 59-71.
Sakidin, Hamzah ; Abu Bakar, Mohd Rizam ; Shariff, Abdul Rashid Mohamed ; Md. Noorani, Mohd. Salmi ; Matori, Abd Nasir ; Mohamed, Azhari ; Ahmad, Asmala. / The effect of UNBabc mapping function modification to GPS tropospheric delay. In: Malaysian Journal of Mathematical Sciences. 2008 ; Vol. 2, No. 1. pp. 59-71.
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