#TITLE_ALTERNATIVE#

• Main Author: PRAYUDHANA (NIM : 15108070); pembimbing :Dr. Techn. Ir. Dudy Darmawan Wijaya, M.Sc Dr., ; Ir.,W, ARYO
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15053
• Institution: Institut Teknologi Bandung

GPS (Global Positioning System) is a radio navigation system and positioning in static and dynamic object using the satellite. To obtain the position of the GPS receiver, there are two things that had to known, which is the location of the GPS satellite and the distance of the GPS satellite to the receiver. The principal of the GPS observation is by the measurement of the distances to some of the GPS satellite which the coordinate has been known. In distance measurement from the GPS satellite to the receiver, the actual distance that has to be measured is the straight distance between the GPS satellite and the receiver. Although because of the refraction effects on the earth’s atmosphere on the signal that is being transmitted by the GPS satellite, the signal distance that is being measured isn’t the straight distance between the GPS satellite and the receiver but the distance that has gone through refraction through the earth’s atmosphere, specifically the ionosphere. <br /> <br /> <br /> <br /> <br /> Practically, measurement errors because of the ionosphere effects could be minimalized with the use of linear combination of the dual frequency observations such as the GPS L1 and L2, which these linear combinations could reduce approximately 90% of the ionospheric refraction. The rest 10% could be defined as the high order ionospheric refraction effect. Although it is only approximately 10%, on high level accuracy GPS applications these high order effects must be taken into account. <br /> <br /> <br /> <br /> <br /> In this research, the subject that will be studied more intensively is the high order ionosphere refraction effects on the GPS accuracy level related with the intensity of the sun. The case that has been studied is the comparison between areas that receives many sun exposure (the earth’s equator) with areas that has less sun exposure (the north hemisphere) on the highest and the lowest of the sun spot number by using the long distance baseline method. The RINEX_HO programs is being used to calculate the corrections of the GPS observations data on high order ionosphere refraction effects and the corrected and the uncorrected results of the long distance baseline methods can be compared afterwards. The result that is being provided by this research is the variance improvement value states that the high order ionosphere refraction is higher on the earth’s equator areas compared to the areas on the northern hemisphere.