Ionospheric critical frequency observation from ionosonde data for GPS positioning improvement over Malaysia

• Main Author: Nagarajoo, Karthigesu
• Format: Conference or Workshop Item
• Language: English
• Published: 2023
• Subjects: T Technology (General)
• Online Access: http://eprints.uthm.edu.my/11149/1/P16696_1fc6e09c0c78fdd66ba81638e37cae64%207.pdf; http://eprints.uthm.edu.my/11149/

This research work was done to determine the critical frequency, fc, variation over Advanced Telecommunication Research Center (ATRC) UTHM by identifying the variability of the ionosphere from Ionosonde. The ionospheric variability was analyzed on diurnal variation basis at Low Solar Activity (LSA) and High Solar Activity (HSA). Ionosonde that was placed in ATRC was used to detect the fc of the ionosphere. Observation data in the form of Ionogram than was used to identify the fc and then the plotted using Matlab. The comparison was done for 2 diurnal solar activity variation data for 2 consecutive months from the year 2011. The results then was compared with the International Reference Ionosphere’s (IRI) fc. Overall, the solar activity has direct effect to the fc during daytime than after Sun set over the equatorial region. By knowing the ionospheric condition, this will be helpful to improve the position of train when applying the European Rail Traffic Management System (ERTMS) in Malaysia later