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A collaboration between the UT Radionavigation Lab, Cornell, and the White Rose of Drachs, is reported in the GPS World magazine.  

"A new method detects spoofing attacks that are resistant to standard RAIM technique and can sense an attack in a fraction of a second without external aiding. The signal-in-space properties used to detect spoofing are the relationships of the signal arrival directions to the vector that points from one antenna to the other. A real-time implementation succeeded against live-signal spoofing attacks aboard a superyacht, the White Rose of Drachs..., cruising in international waters."

Continue reading the article at GPS World