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Spoofing is the common term used for describing the intentional broadcasting of false radio frequency signals intended to disrupt and mislead systems that depend on accurate position, navigation, and timing information provided by the Global Positioning System (GPS). Spoofing is an increasingly recognized threat which is garnering increased interest from researchers and users, both military and civilian. This thesis presents a novel GPS spoof detection algorithm that exploits the geometric distribution of a horizontal array of GPS antenna-receivers and the geometric configuration of visible navigation satellites. Using a Neyman-Pearson hypothesis testing formulation, a spatial correlation test is developed that can accurately and dependably detect a GPS spoofing scenario. Analysis is conducted showing the performance effects of the number of receivers used, internal receiver clock bias estimation, and temporal and spatial locations of the detector. Simulations were conducted using theoretical definitions of false alarm and detection probabilities, a GPS simulator and receiver combination, and a live-sky experimental set-up. Experimental and theoretical performance results are presented. ACKNOWLEDGMENTS I would like to first acknowledge my advisor, Dr. Peter Swaszek for his guidance and mentorship during the course of this work and my studies at University of Rhode Island. His insight and intuition was invaluable in solving many of the challenges in the implementation of this research. The theory behind this detection solution is the product of Dr. Swaszek’s expertise and ingenuity; I appreciate the opportunity to contribute to the theory and demonstrate its effectiveness. Many thanks are due to Dr. Richard Hartnett, Capt USCG (Ret.) and Commander Kelly Seals, USCG, from the U.S. Coast Guard Academy Electrical Engineering section; because of their support, encouragement, and knowledge I have had the opportunity to pursue this research and an advanced degree in Electrical Engineering. For inviting me to participate in the team with themselves and Dr. Swaszek researching this problem, I am grateful. I would also like to acknowledge Senior Chief Electronics Technician Ken McKinley, USCG, and Electronics Technician Second Class Rob Gutzeit, USCG, for their support and technical knowledge; their assistance was instrumental in completing the simulations and experiments described in this study. It is due to the love and support of my family, Michael, Sharon, and Andrew Radin, that I am in a position to contribute this research to the pursuit of scientific knowledge. I couldn’t have asked for a more awesome family. And to my beautiful and loving wife Brenna, whose understanding, patience, and compassion is infinite, thank you for everything, I love you, and aloha!

GPS SPOOFING DETECTION USING MULTIPLE ANTENNAS AND INDIVIDUAL SPACE VEHICLE PSEUDORANGES