GPS spoofing detection using multiple antennas and individual space vehicle pseudoranges

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