Uydu Haberleşme Sistemlerinde Girişim Kaynağı Yer Belirleme Yöntemleri

Abstract

Satellite communication, which has fast and high-capacity but also low-cost systems that enable communication over long distances, is frequently used for civil and military communication purposes today. Communication disruptions may occur due to intentional or unintentional disruptive signals. The negative impact of communication causes important problems such as the inability of satellite operators such as TÜRKSAT to provide proper service to users and the lack of coordination between military units. In order to solve such problems, first of all, it is necessary to know where the interfering signal originates from. Satellite operators and armed forces on Earth have geolocation systems that detect the location of the jamming signal source. These systems use satellites that are in active use in orbit to locate jamming broadcasts. Existing geolocation systems can perform position determination with two or three satellites in orbit. In this thesis, various approaches and methods used to determine the locations of disturbance signal sources that adversely affect satellite communication are discussed. The position estimation processes of the jamming signal source are based on the TDOA, FDOA equations created by the satellites, the geolocation system and the interfering system, and ellipsoid equation from the Earth's shape. The position and velocity components of the satellites, which are required to create the TDOA and FDOA equations, are obtained by using the Kepler elements in the satellite TLE dataset. Various numerical analysis methods such as Newton and Broyden methods are used for the solution of nonlinear equation systems formed by these equations. For the solution of the nonlinear equation systems formed by these equations, the methods of interference geolocation have been studied by using numerical analysis methods such as Newton and Broyden methods.