[time-nuts] The Demise of LORAN (was Re: Reference oscillatoraccuracy)

Didier Juges didier at cox.net
Sun Nov 15 17:45:54 UTC 2009


Enough for what? To bug the heck out of a citizen suddenly unable to find his way to the movie theater?

Weapon systems and aircraft navigation  are unlikely to be affected by such a simple device on the ground, even if deployed in large quantity. Most of the stuff that really needs GPS has decent antennas that look up, not down.

Didier

------------------------ Sent from my BlackBerry Wireless thingy while I do other things... 

-----Original Message-----
From: "J. Forster" <jfor at quik.com>
Date: Sun, 15 Nov 2009 09:23:12 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Subject: Re: [time-nuts] The Demise of LORAN (was Re: Reference oscillator
 accuracy)

Thanks Chuck,

My point EXACTLY.

1. It's well within the capability of dozens of countries or organizations
or even individuals.

2. They are trivial to distribute widely, and could be piggy-backed onto
other things.

3. Given enough of them with random on-off cycles, you'd force a giant
game of Whak-A-Mole.

A guy in his basement could easily build 100 in a week given a design and
PCB layout. In another week he could scatter them all over a city, even if
travelling by bus. The whole operation would cost under a few thousand
dollars.

Furthermore, it would not be needed to kill all the GPS in an area, all
the time. Making it unreliable would likely be enough.

FWIW,
-John

==================



> I guess the point you folks aren't getting is you can make a very
> effective local GPS jammer that runs off of a 9V transistor radio battery,
> and will last for several weeks.  It can be done for a total cost of
> a few bucks per jammer.... search the web, the designs are out there.
>
> Toss the GPS jammers indiscriminately around the landscape, and you put
> GPS out of business for a very low cost.
>
> -Chuck Harris
>
> Mike Monett wrote:
>>
>>   It should  be easy to locate a jammer. Go to the area where  the GPS
>>   signal is being jammed. Drive in some direction until the  signal is
>>   regained. Repeat to find three locations where the signal is lost.
>>
>>   Three points define a circle. The diameter tells the strength of the
>>   jamming signal. The center defines the location.
>>
>>   Once you are near the center, ordinary DF techniques  should quickly
>>   identify the source.
>>
>
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