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    Re: Fwd: Re: GPS "spoofing"
    From: Peter Monta
    Date: 2013 Jul 28, 16:46 -0700

    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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