It doesn't, and I don't think that there is really a software solution to this. IMO the proper solution is to use multiple receive antennas to verify that the

It doesn't, and I don't think that there is really a software solution to this. IMO the proper solution is to use multiple receive antennas to verify that the signals are coming from the expected direction. Then if your adversary isn't capable of orbiting a clone of all of the GNSS constellations or flying dozens of precisely positioned drones above you, you can't be spoofed.