GNSS Signal Authentication Via Power and Distortion Monitoring

We propose a simple low-cost technique that enables civil global positioning system receivers and other civil global navigation satellite system (GNSS) receivers to reliably detect carry-off spooling and jamming. The technique, which we call the power-distortion detector, classilies received signals as interference-free, multipath-afflicted, spoofed, or jammed according to observations of received power and correlation function distortion. It does not depend on external hardware or a network connection and can be readily implemented on many receivers via a lirmware update. Crucially, the detector can with high probability distinguish low-power spooling from ordinary multipath. In testing against more than 25 high-quality empirical datasets yielding more than 900,000 separate detection tests, the detector correctly alarms on all malicious spooling or jamming attacks while maintaining a 0.6% single-channel false alarm rate.