Date

2023-1-23

Author

Üstündağ, Mehmet Buğrahan

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As the number of applications relying on global navigation satellite systems increases, GNSS becomes to play a bigger role in the daily life. But recent studies and incidents prove how vulnerable GNSS can be against the intentional spoofing and jamming attacks. Due to ever-growing threat caused by spoofing attacks, reliability and security of the GNSS signals become a major concern that must be dealt with and it has become necessary to develop effective detection algorithms. This thesis study examines a growing concern in modern navigation systems. The thesis investigates methodologies of spoofing along with detection techniques. To detect intentional interference attacks to ensure reliability of the global positioning systems, high-end solutions can be utilized. But these solutions lead to reduce accessibility of the GNSS receivers. To preserve approachability of the GNSS receivers high, low-cost and low-profile solutions must be developed. These solutions can be realized by using low-cost commercial off-the-shelf receivers and open-source GNSS receivers. Therefore, the thesis investigates low-cost solutions against spoofing attacks using highly accessible commercial off-the-shelf receivers and open-source software defined receivers. The thesis implements spoofing attack scenarios created by an open-source GPS signal simulator. Scenarios are simulated in both software and hardware domains. Attacks are created and received by using software defined radios and commercial off-the-shelf GPS receivers. In software domain an open-source GPS simulator is used along with an open-source GNSS receiver. Furthermore, an open-source test battery is used to examine effects of more sophisticated GPS spoofing attacks. For detection algorithms, the study focuses on pre-correlation techniques employing power-related metrics and signal quality monitoring techniques employing correlator values. The thesis examines effects of different types of spoofing attacks to victim receiver and tries to specify detection methods for each spoofing type.

Subject Keywords

GPS spoofing detection, software defined radio, power monitoring methods, automatic gain control, signal quality monitoring

URI

https://hdl.handle.net/11511/102086

Collections

Graduate School of Natural and Applied Sciences, Thesis