#TITLE_ALTERNATIVE#

• Main Author: JULIANDI (NIM: 15109031); , FIKRI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18496
• Institution: Institut Teknologi Bandung

The ionosphere is physically a dispersive medium thus the GPS signals that travels through this medium are affected by their frequencies. Hence, the L1 and L2 carrier wave that has diferent frequencies does not travel in the same path when they pass through the ionosphere. Therefore, it is necessary to compare the difference in value from the Slant Total Electron Content (STEC) calculation from the GPS signals if the effects of the different signal path is considered. The method used for this research is the smoothing of the P1 and P2 code data, so it can be used to obtain the STEC with 30 second per epoch by using the Geomteric-Free and Impoved Geometric-Free formula that already considers the effects of the different signal paths. GPS observation data with rinex format is obtained from several International GNSS Service (IGS) on 2008 and 2013. The data is obtained from observation areas that covers the mid-latitude zone in Algonquin Park (Canada), the equator zone in Bakosurtanal (Indonesia), and the earth’s pole zone in Syowa (The South Pole). The calculation result shows that in terms of geographical position, the deviation of the calculation result between the IGF method and the GF method on the Algonquin Park IGS which is located on the mid latitude shows a greater value compared to the IGS Syowa station which is located on the south pole area. While the IGS Bakosurtanal which is located on the equatorial zone has a greater value compared to both. The deviation grows larger because of the high solar activity in 2013. The obtained result from the delta-STEC processing which is the deviation between the IGF calculation method compared to the GF method shows that the maximum delta-STEC value is just 20.5 miliTECU on the equatorial zone (Bakosurtanal) when the solar activity is considered high (in 2013). Thus the signal propagation effects do not significantly affect the accuracy of the TEC which has not reached the accuracy in the miliTECU level.