Effect of Fresnel First Zone on Trans-ionosphere Propagation of GNSS Signal

Cherinet, Assefa

dc.contributor.author	Cherinet, Assefa
dc.date.accessioned	2025-08-05T08:07:39Z
dc.date.available	2025-08-05T08:07:39Z
dc.date.issued	2025-06
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/16832
dc.description.abstract	The trans-ionospheric propagation of Global Navigation Satellite System (GNSS) signals is significantly influenced by ionospheric irregularities, particularly at equatorial and low-latitude regions. This study investigates the effect of the Fresnel First Zone a fundamental concept in wave diffraction on GNSS signal scintillation. The Fresnel scale defines the spatial dimensions of ionospheric irregularities that most strongly scatter GNSS signals, causing amplitude and phase scintillations that degrade signal quality. Using theoretical models and observational data, including S4 index measurements, the research analyzes how variations in electron density and irregularity drift affect signal propagation. The findings underscore the importance of the Fresnel First Zone in understanding diffractive scattering processes and provide insight into the mitigation of GNSS signal disruptions, especially in space weather-sensitive regions. This work contributes to enhancing GNSS reliability for communication and navigation applications.	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	Effect of Fresnel First Zone on Trans-ionosphere Propagation of GNSS Signal	en_US
dc.type	Thesis	en_US