In message <[email protected]>, Magnus Danielson writes:

>distance from the jammer until affected. It's a fairly well-understood 
>problem and the difference between civilian and military receivers lies 
>in signals, keying for access, bootstrapping and testing and 
>counter-measures such as IMU.

Not to mention clocks:  The more stable clock a GPS receiver has, the
harder it is to jam it, because the "unspread bandwidth" can be
much tighter.

Somebody showed a specially tuned GPS receiver, clocked from Cs to
be pretty much invulnerable to "randomised" jamming.

-- 
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