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

[Alan Melia]

Many "scanners" now go to that frequency e.g AOR AR-8600. (100kHz to 2GHz ) 
They are hardly state-of-the-art receivers but should be capable of 
detecting jammers driving past. However a new unit is quite pricey $1000 
equivalent in the UK as little as $300 for a used version. Also the AMSAT 
FCD Pro+ USB SDR at $200 and free software.

Alan
G3NYK

----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, October 07, 2013 12:36 PM
Subject: Re: [time-nuts] How hard is it to detect a GPS Jammer?


> 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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