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Frank writes:


> ... detectable feature of a spoofed GPS signal would be its apparent
> directionality.

Yes, such an approach is described here:


http://www.gpsworld.com/innovation-gnss-spoofing-detection-correlating-carrier-phase-with-rapid-antenna-motion/

I wonder whether similar results could be had by just switching
between two antennas, which might be mechanically more convenient than
moving a single one.  If the jump vector were known it could be aided
out, so the receiver need not even lose lock.

Is celestial immune, though?  It could be spoofed with enough
resources.  Deploy a number of UAVs around the ship.  Some are
equipped with small screens, which would be interposed between the
real stars and the user's sextant.  Others would simulate new stars
with a light source (and collimator I suppose).  Something like the
scene from Master and Commander in which Aubrey spoofs a pursuing ship
with fake lanterns.

If the celestial system were automatic, it might not notice the sudden
jump to fake stars, nor their sudden suspiciously large parallaxes.

Cheers,
Peter

   

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