[Milsurplus] Naval Aviation Navigation

mikea mikea at mikea.ath.cx
Tue Mar 14 13:49:17 EST 2006


On Tue, Mar 14, 2006 at 01:35:51AM +0000, ampop at comcast.net wrote:
> Does anyone know what our current Carrier Forces would use under
> EMCON or in Combat situations??? GPS??  My underastanding of
> DOD and what might happen to GPS is that the resolution of the 
> System would be reduced but not entirely shut down.  BobW

Odds are that the dither ("Selective Availablilty") would be put back into
the (already low resolution) civilian signal. Even so, that's good enough
for the miltary GPSes to sync up on the encrypted high-resolution signal.

The civilian GPSes can't use the high-res signals because they don't have
the crypto keys; the military (and government non-military) GPSes can, but
have to have a very good idea of what the time is in order to decrypt the 
encrypted signal. 

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin 


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