"correctly detect spoofing in three cases during the demo"--three out of three or three out of hundreds?

Seems to me there's already a couple of companies which build such spoofers, or simulators as they might be called. Pretty sure these companies also have "spoofer-resistant" receivers. I'm curious what their "patent-pending" integrity-monitoring methods include.

I must be missing something. How does something spoof a satellite the is in geo orbit.

Next step for the bad guys is to get some of these radios and then figure out how to outwit them. Consider the extraordinary amount of resources that can be brought to bear by potential antagonists (e.g. governments of other countries).

I imagine for high reliability, other sorts of backup navigation systems will be employed alongside GPS. Maybe as simple as a camera that can view the terrain and compare it to what it should be.