[time-nuts] GPS Spoofing
Poul-Henning Kamp
phk at phk.freebsd.dk
Sun Jul 28 13:00:37 EDT 2013
In message <26BB6F2A-69AC-4587-8057-BA18A03E8A6B at rtty.us>, Bob Camp writes:
>Bumping it a bit this way or that is not an impossibility. A little
>bit of added phase this way or that is all it would take. You would have
>to get the rep rate and timing right, but that's just the sort of thing a
>Time Nut knows how to do on the cheap.
Only its not actually possible in practice.
The problem with GNSS is that the kit to jam/spoof is sub-suitcase-sized.
To jam/spoof LORAN-C or any other VLF system, you need several
trucks: One for the generator, one for the antenna -- at least.
That's the reason why LORSTA's have 600' antenna towers to begin with.
LORAN-C may not be as precise, but it is very stable, which means
that your dual-source nav-kit will tell you that GPS and LORAN-C
diverges in ways that looks odd...
The reason why we still have LORAN-C in europe, is that UK and
France don't trust DoD to not play with GPS.
--
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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