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Evaluation of the RF Link in the Starlink Satellite Network and Analysis and Simulation of Phased Array Antennas used in this Network
, M.Sc. Thesis Sharif University of Technology ; Farzaneh, Forouhar (Supervisor)
Abstract
In this thesis, the radio link of the Starlink satellite communication system is examined and analyzed. Initially, the general characteristics of the system such as the number and type of satellites, speed and orbital parameters, frequency bands, modulations, multiple access methods, and duplexing techniques are described. Subsequently, the analysis and simulation of the phased array antenna in the user segment are addressed. This includes: 1) Estimation of \varepsilon_r and the thickness of substrates through the analysis and simulation of transmission lines used in the printed circuit board using CST and ADS software, 2) Analysis and simulation of a single antenna element by CST software,...
Passive Positioning with Low Earth Orbit Satellites
, M.Sc. Thesis Sharif University of Technology ; Behroozi, Hamid (Supervisor) ; Amiri, Rouhollah (Supervisor)
Abstract
The Global Navigation Satellite System (GNSS) is widely utilized for positioning and navigation purposes; however, its continuous accessibility is not guaranteed. Challenges such as signal disruption at the source, interference, or the transmission of erroneous signals targeting the communication between receivers and the system have consistently posed significant obstacles to its reliable use. This research aims to develop a passive and opportunistic positioning method leveraging Low Earth Orbit (LEO) satellites, with a particular focus on the Starlink constellation. This approach effectively addresses the aforementioned challenges to a significant extent while offering a highly...
Exploring Possibility and Performance Evaluation of a Passive Radar based on Starlink Satellites
, M.Sc. Thesis Sharif University of Technology ; Behnia, Fereydoon (Supervisor)
Abstract
The application of airborne passive bistatic radar (PBR) represents the latest advancement in passive radar technology. An airborne passive system is cheaper, lighter, easier to cool, and requires less power compared to a conventional active radar. A comprehensive literature review revealed a lack of both theoretical and experimental research in the field of airborne passive bistatic radar. In this study, the design principles of passive bistatic radar systems, along with the key factors affecting the design phase, are examined. Signal analysis of external sources shows that Starlink satellite signals outperform other illumination sources. The importance of reference signal quality, the need...