[time-nuts] How hard is it to detect a GPS Jammer?

Bob Camp lists at rtty.us
Mon Oct 7 07:36:40 EDT 2013


Hi

Anything that will receive up there should be able to tell you when a jammer comes by. The issue is that not a lot of gear is made for that band (other than GPS receivers). The easy approach would be to use a modern GPS module that puts out noise level / jamming information. 

Bob


On Oct 7, 2013, at 12:59 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> The recent discussion of solar flares screwing up GPS timing was interesting.
> 
> I just watched Todd Humphreys TED talk again.  He's focused on location, but 
> does mention time in terms of stock exchanges.
>  Todd Humphreys: How to fool a GPS
>  http://www.ted.com/talks/todd_humphreys_how_to_fool_a_gps.html
> 
> He's got a good discussion of GPS jammers and spoofers, but no geeky details.
> 
> 
> What's the spectral/power output of the typical eBay GPS jammer?
> 
> Suppose I lived near a major highway.  Could I build a receiver that would 
> count jammers driving by?  Could I track them (at least somewhat) with a 
> directional antenna on a rotator?
> 
> Is this something semi-geeky amateurs could contribute to?
> 
> What sort of gear has harmonics in the GPS band?
> 
> ------
> 
> I assume people are familiar with the trucker who jammed the FAA test in NJ.  
> Here is a good story:
>  http://www.insidegnss.com/node/3676
> 
> That article has a link to commercial gear targeted at this market.
>  http://www.exelisinc.com/solutions/signalsentry/Pages/default.aspx
> The graphics shows 3 receivers is a port/harbor setting.
> 
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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