[ntp:questions] GPS Jammers in Use by Criminals - Warping Time for Fraud Suggested

unruh unruh at invalid.ca
Thu Feb 23 21:35:23 UTC 2012

On 2012-02-23, jimp at specsol.spam.sux.com <jimp at specsol.spam.sux.com> wrote:
> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>> On 2/22/2012 5:16 PM, David Woolley wrote:
>>> An article in the Metro, the free morning paper on the London commuter
>>> transport network, suggests that criminals may be using GPS jamming
>>> equipment to warp the time on financial systems to allow the commission
>>> of fraud.
>> GPS is not the only source of time!
>> In the U.S. 60 cycle Alternating Current is the standard and the source
>> of time.  It's not going to give you the nanoseconds but very few people 
>> could even explain what a nanosecond is let alone needing nanosecond 
>> resolution.
> There are very few civilian systems where absolute time accuracy greater
> than 1 second is an operational requirement and none that I can think of
> where sub-microsecond absolute time accuracy is an operational requirement.

Long baseline radio astronomy? Timing neutrinos between Cern and Grand
Sasso? ...
Both are civilian, and both absolutely require nano second accuracy. 

>>> Although I can't find the source of that article, the BBC has an
>>> article, presumably from the same underlying source, addressing another
>>> point in that that article, that GPS jammers are increasingly being used
>>> to defeat GPS based car tracking systems.
>> If anyone wants to track my car's location, you're welcome.  And I hope 
>> that no one dies of boredom!
> In this case what is being jammed is position, not time, and this is so
> smarter car thieves can defeat systems like LoJack.
> This is a much easier case as all that has to be jammed is the GPS in the
> car being stolen.

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