Abstract

The free electron distributed in the atmospheric region known as the ionosphere produces a frequency dependent effect
on the Global Positioning System (GPS) signals, a delay in the pseudorange and advance in the carrier phase. The
ionospheric influence is one of the main problems in the real-time ambiguity resolution for the carrier phase GPS data
in radio navigation. Real Time Kinematics (RTK) and Malaysian Active Station (MASS) data from JUPEM (Jabatan
Ukur dan Pemetaan Malaysia) were used in this analysis. In this study, the effects of initial phase ambiguity at GPS and
modeling of ionosphere on base components were researched. To overcome this problem, a correction ionospheric
model was used. This correction model could be implemented in single frequency measurements with similar accuracy,
which can be obtained from dual frequency.

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