Analysis of Multi-Frequency GNSS Ionosphere Scintillation over Bahir Dar Ethiopia

Amisaya, Meseret

dc.contributor.author	Amisaya, Meseret
dc.date.accessioned	2024-07-24T09:55:25Z
dc.date.available	2024-07-24T09:55:25Z
dc.date.issued	2024-06
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/15896
dc.description.abstract	Global Navigation Satellite System (GNSS) and international telecommunications critical to a modern technological world are frequently disrupted by the Earth’s iono sphere. Trans-ionospheric satellite navigation links operate primarily at L band and are frequently subject to severe degradation of performances arising out of ionospheric ir regularities. As human society has become heavily dependent on GNSS services, timely and accurate space weather characterization and forecasts are needed. This analysis investigates the frequency dependence of ionospheric scintillation on GNSS signals. By examining data from multiple GNSS frequencies, the study aims to understand how scintillation affects different signal frequencies and to identify patterns in scintillation behavior. The data derived from high-rate Global Navigation Satellite System (GNSS) receiver located at Bahir Dar University, Ethiopia, were used to analyze the effect of ionospheric scintillation on GNSS signals with different frequency bands. The results are presented for data recorded by GNSS receiver during the last solar maximum in 2015. Observation data from two GNSS receiver stations msbd01 and msbd02 were used to investigate the characteristics of ionospheric scintillation across different fre quency bands for GPS, GLONASS and Galileo constellations. The results showed that the amplitude scintillations were observed during local sunset. The influence of ionospheric scintillation on different frequency GNSS signals is also different. During strong scintillation events, there is a reduction in the correlation coefficient between different frequency signals, indicating that the ionospheric irregularities affect different frequencies differently. It is found that the higher frequencies experienced less severe amplitude scintillation compared to lower frequency signals during scintillations. We also used continuous wavelet transform to detect the ionospheric plasma bubble causing scintillations. This work would be helpful for understanding the features of GNSS amplitude scintillations over the equatorial regions. The findings will help improve GNSS receiver performance and develop effective mitigation strategies. Moreover, these kinds of investigations are helpful for developing new algorithms to forecast ionospheric scintillations over such regions.	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	Analysis of Multi-Frequency GNSS Ionosphere Scintillation over Bahir Dar Ethiopia	en_US
dc.type	Thesis	en_US