Design and implementation of L1 C/A GPS transmitter for spoofing applications

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2022-12-01

Author

Tunçyürek, Yunus Emre

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GPS is one of the main positioning services used in both military and civilian applications. It is possible to design a custom GPS Transmitter by using the SDR platform and periodically published Orbital Parameters. The realization of such a system brings spoofing threats for GPS Receivers. In this thesis, the baseband GPS signals are created by considering the pseudoranges and Doppler Frequencies for the specific user position with respect to the satellite positions whose orbital parameters are open to access. In addition, created baseband signals are translated to the RF stage through SDR, and the impact of the system on commercial GPS receivers are analyzed for the different kind of scenarios involving static and moving users in different directions. Finally, the hardware’s default TCXO-based clock is replaced with that of OCXO-based to examine its influence on the GPS performance. The performance of the suggested system is measured with the U-Blox and Mobile Phone’s GPS receivers. Also, the system is tested with receivers having access to the real GPS signals to explore the spoofing capability.

Subject Keywords

GPS transmitter, L1 C/A, SDR, Spoofing, Doppler

URI

https://hdl.handle.net/11511/101319

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Y. E. Tunçyürek, “Design and implementation of L1 C/A GPS transmitter for spoofing applications,” M.S. - Master of Science, Middle East Technical University, 2022.