There are apparently multiple types of jammers. The swept VCO takes a lot of
power and is really obvious. Feeding a noise source to a VCO takes the same
power but is apparently a bit more stealthy. I'm seeing reference to a
"chirped" type of jammer, which I assume takes less power?
At the Institute of Navigation GNSS conference a few weeks ago, there was a
whole track on interference and spectrum
issues:http://www.ion.org/gnss/program.cfm
I haven't looked to see if they're available anywhere, but a good starting
point might be to track down some of these papers:
Signal Acquisition and Tracking of Chirp-Style GPS Jammers: R. Mitch, M.
Psiaki, S. Powell, B. O'Hanlon, Cornell University; J. Bhatti, University of
Texas at Austin
A Novel Detection and Tracking Algorithm of Chirp Type Civilian GNSS
Interference: C.H. Kang, S.Y. Kim, C.G. Park, Seoul National University,
Republic of Korea
An Interference Monitoring System for GNSS Reference Stations: J. Wendel, C.
Kurzhals, Astrium GmbH, Germany; M. Houdek, Iguassu Software Systems; J.
Samson, ESA
-Nate B-
Bob Camp wrote:
> 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 <[email protected]> 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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