# Effect of GPS tropospheric delay Neill mapping function simplification

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

### Abstract

The mathematical modeling on the mapping function models should be revised and also simplified to improve the calculation of the GPS tropospheric 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. Most of the modern models have separated mapping functions for the hydrostatic and the wet part. Recently, the developed tropospheric delay models use mapping functions in the form of continued fractions which is quite tedious in calculation. There are 26 mathematical operations for Neill Mapping Function (NMF) to be done before getting the mapping function scale factor. There is a need to simplify the mapping function models to allow faster calculation and also better understanding of the models. The mapping functions for NMF models for hydrostatic and wet components are given in a form of continued fraction, whereby the elevation angle is the variable. These mapping function models have been selected to be simplified, because of their ability to achieve mapping function scale factor, down to 3 degree of elevation angle.

Original language English 95-107 13 Malaysian Journal of Mathematical Sciences 3 1 Published - 2009

### Fingerprint

Simplification
Scale factor
Hydrostatics
Continued fraction
Model
Angle of elevation
Mathematical Modeling
Simplify
Angle
Calculate

### Keywords

• Mapping function
• Tropospheric
• Zenith

### ASJC Scopus subject areas

• Mathematics(all)

### Cite this

Sakidin, H., Abu Bakar, M. R., Mohamed Shariff, A. R., Md. Noorani, M. S., Matori, A. N., & Mohamed, A. (2009). Effect of GPS tropospheric delay Neill mapping function simplification. Malaysian Journal of Mathematical Sciences, 3(1), 95-107.

Effect of GPS tropospheric delay Neill mapping function simplification. / Sakidin, Hamzah; Abu Bakar, Mohd Rizam; Mohamed Shariff, Abdul Rashid; Md. Noorani, Mohd. Salmi; Matori, Abd Nasir; Mohamed, Azhari.

In: Malaysian Journal of Mathematical Sciences, Vol. 3, No. 1, 2009, p. 95-107.

Research output: Contribution to journalArticle

Sakidin, H, Abu Bakar, MR, Mohamed Shariff, AR, Md. Noorani, MS, Matori, AN & Mohamed, A 2009, 'Effect of GPS tropospheric delay Neill mapping function simplification', Malaysian Journal of Mathematical Sciences, vol. 3, no. 1, pp. 95-107.
Sakidin H, Abu Bakar MR, Mohamed Shariff AR, Md. Noorani MS, Matori AN, Mohamed A. Effect of GPS tropospheric delay Neill mapping function simplification. Malaysian Journal of Mathematical Sciences. 2009;3(1):95-107.
Sakidin, Hamzah ; Abu Bakar, Mohd Rizam ; Mohamed Shariff, Abdul Rashid ; Md. Noorani, Mohd. Salmi ; Matori, Abd Nasir ; Mohamed, Azhari. / Effect of GPS tropospheric delay Neill mapping function simplification. In: Malaysian Journal of Mathematical Sciences. 2009 ; Vol. 3, No. 1. pp. 95-107.
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