[time-nuts] GPS backup for the stationary time and frequencyuser

[Brooke Clarke]

Hi Magnus:

Stanford Telecom built GPS simulators to test their GPS ICs.  It's made 
where each wire wrap PCB is based on a page from ICD-200.
http://www.prc68.com/I/5001A.html

Have Fun,

Brooke Clarke
http://www.PRC68.com


Magnus Danielson wrote:
> On 10/09/2010 04:47 PM, Matthew Kaufman wrote:
>> 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.
>
> Indeed.
>
>> 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.
>
> Hmm. Yes. Creative! Once demonstrated essentially all WAAS/EGNOS/SBAS 
> sats need to develope some protective measure.
>
> To pull it off, a standard GPS simulator and some minor frequency 
> conversion is needed. Should not stop the handy man.
>
> It would be an interesting legal aspect to attempt to charge the 
> guilty...
>
> Cheers,
> Magnus
>
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-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com