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

jimp at specsol.spam.sux.com jimp at specsol.spam.sux.com
Thu Feb 23 23:57:21 UTC 2012

Rick Jones <rick.jones2 at hp.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.
> Wasn't there something about an experiment to relax the frequency
> requirements on the power grid in North America?  And the financial
> services types may not be at the nanosecond level, but they (think
> they) are at the microsecond level.
> rick jones

The absolute frequency accuracy in the US has never been anywhere close to
the microsecond level.

What was guaranteed was the long term average would be 60 Hz so things
like clocks with synchronous motors would be within a few seconds over
day long periods.

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