Spoofing Mitigation, Robust Collision Avoidance, and Opportunistic Receiver Localisation Using a New Signal Processing Scheme for ADS-B or AIS

A signal processing scheme based on phase interferometry is developed here that provides anti-spoof capabilities for ADS-B or AIS using a compact, dual-antenna softwaredenied radio. The expected performance using existing radio technologies and two short baselines is demonstrated for ADS-B. The abilities of the proposed method include spoof detection (ADS-B, AIS and GNSS), collision avoidance in the presence of spoofers, and self-localisation in the absence of GPS. The system can provide bearing estimates of other aircraft in the vicinity broadcasting legitimate or spoofed ADS-B with accuracies of a degree with an antenna baseline of one metre, and self-positioning accuracies of approximately 100 metres for the same baseline. The applicability of the technique to AIS in the maritime domain is also discussed.