On 10/8/2010 1:48 PM, Magnus Danielson wrote:
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.
Threat model is different here. The end-user terminals for TV sats have
narrow antennas looking at just that satellite, so it affects just that
satellite/transponder.
The end-user terminals for GPS are looking at the entire hemisphere of
sky, so if you can send spoofed signals from the WAAS transponder (same
RF frequency that all the rest of the GPS satellites are using to talk
to single-frequency receivers) and get the receivers to lock to these
signals instead of the legitimate ones, you can interfere with *all* GPS
reception, not just the WAAS signal, for the entire coverage area of WAAS.
Matthew Kaufman
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