[time-nuts] The Demise of LORAN (was Re: Reference oscillatoraccuracy)

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Nov 15 20:54:47 UTC 2009


In message <4B006929.3010809 at rubidium.dyndns.org>, 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.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



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