On 10/08/2010 08:07 PM, Matthew Kaufman wrote:
On 10/8/2010 10:44 AM, J. Forster wrote:
KISS. This seems like a lot of work for not particularily good results.
I think the point is that the results are amazingly better than the
alternative if the medium-orbit GPS sats are all destroyed and/or
there's jamming coming from all over the sky.
What bothers me is that I haven't figured out yet how the WAAS satellite
configuration itself isn't usable as a wide-area GPS jammer. It is just
a bent-pipe transponder down from 6 GHz or so to L1, so if you can
overpower the uplink with spoofed data that interferes with reception of
the other satellites *and* jam the C&C channels that would be used to
shut the transponder off, you're able to jam a whole continent at once.
I'm sure this must have been considered before deployment, but I can't
find any references to the countermeasure(s).
I would not be supprised if they had not considered such a threat.
This is a common threat for all bent-pipe birds. They have been jammed
before and we can expect them to be jammed again. However, I do not
think the WAAS or any similar is highest up on the target list as for
most uses it is a support-function rather than main function system.
Birds which has been jammed is typically TV signal relays.
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
